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[BAEL-9555] - Created a core-java-modules folder

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This commit is contained in:
amit2103
2019-05-05 17:22:09 +05:30
parent 8b63b0d90a
commit 3bae5e5334
1480 changed files with 25600 additions and 5594 deletions
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9
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/Public.java Normal file
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package com.baeldung.accessmodifiers;
public class Public {
public Public() {
SuperPublic.publicMethod(); // Available everywhere.
SuperPublic.protectedMethod(); // Available in the same package or subclass.
SuperPublic.defaultMethod(); // Available in the same package.
}
}

9
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/SubClass.java Normal file
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package com.baeldung.accessmodifiers;
public class SubClass extends SuperPublic {
public SubClass() {
SuperPublic.publicMethod(); // Available everywhere.
SuperPublic.protectedMethod(); // Available in the same package or subclass.
SuperPublic.defaultMethod(); // Available in the same package.
}
}

39
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/SuperPublic.java Normal file
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package com.baeldung.accessmodifiers;
//Only public or default access modifiers are permitted
public class SuperPublic {
// Always available from anywhere
static public void publicMethod() {
System.out.println(SuperPublic.class.getName() + " publicMethod()");
}
// Available within the same package
static void defaultMethod() {
System.out.println(SuperPublic.class.getName() + " defaultMethod()");
}
// Available within the same package and subclasses
static protected void protectedMethod() {
System.out.println(SuperPublic.class.getName() + " protectedMethod()");
}
// Available within the same class only
static private void privateMethod() {
System.out.println(SuperPublic.class.getName() + " privateMethod()");
}
// Method in the same class = has access to all members within the same class
private void anotherPrivateMethod() {
privateMethod();
defaultMethod();
protectedMethod();
publicMethod(); // Available in the same class only.
}
}
// Only public or default access modifiers are permitted
class SuperDefault {
public void publicMethod() {
System.out.println(this.getClass().getName() + " publicMethod()");
}
}

9
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/another/AnotherPublic.java Normal file
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package com.baeldung.accessmodifiers.another;
import com.baeldung.accessmodifiers.SuperPublic;
public class AnotherPublic {
public AnotherPublic() {
SuperPublic.publicMethod(); // Available everywhere.
}
}

10
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/another/AnotherSubClass.java Normal file
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package com.baeldung.accessmodifiers.another;
import com.baeldung.accessmodifiers.SuperPublic;
public class AnotherSubClass extends SuperPublic {
public AnotherSubClass() {
SuperPublic.publicMethod(); // Available everywhere.
SuperPublic.protectedMethod(); // Available in subclass. Let's note different package.
}
}

9
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/another/AnotherSuperPublic.java Normal file
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package com.baeldung.accessmodifiers.another;
import com.baeldung.accessmodifiers.SuperPublic;
public class AnotherSuperPublic {
public AnotherSuperPublic() {
SuperPublic.publicMethod(); // Available everywhere. Let's note different package.
}
}

13
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/casting/Animal.java Normal file
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package com.baeldung.casting;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Animal {
private static final Logger LOGGER = LoggerFactory.getLogger(Animal.class);
public void eat() {
LOGGER.info("animal is eating");
}
}

23
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/casting/AnimalFeeder.java Normal file
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package com.baeldung.casting;
import java.util.List;
public class AnimalFeeder {
public void feed(List<Animal> animals) {
animals.forEach(animal -> {
animal.eat();
if (animal instanceof Cat) {
((Cat) animal).meow();
}
});
}
public void uncheckedFeed(List<Animal> animals) {
animals.forEach(animal -> {
animal.eat();
((Cat) animal).meow();
});
}
}

24
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/casting/AnimalFeederGeneric.java Normal file
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package com.baeldung.casting;
import java.util.ArrayList;
import java.util.List;
public class AnimalFeederGeneric<T> {
private Class<T> type;
public AnimalFeederGeneric(Class<T> type) {
this.type = type;
}
public List<T> feed(List<Animal> animals) {
List<T> list = new ArrayList<T>();
animals.forEach(animal -> {
if (type.isInstance(animal)) {
T objAsType = type.cast(animal);
list.add(objAsType);
}
});
return list;
}
}

16
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/casting/Cat.java Normal file
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package com.baeldung.casting;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Cat extends Animal implements Mew {
private static final Logger LOGGER = LoggerFactory.getLogger(Cat.class);
public void eat() {
LOGGER.info("cat is eating");
}
public void meow() {
LOGGER.info("meow");
}
}

12
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/casting/Dog.java Normal file
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package com.baeldung.casting;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Dog extends Animal {
private static final Logger LOGGER = LoggerFactory.getLogger(Dog.class);
public void eat() {
LOGGER.info("dog is eating");
}
}

5
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/casting/Mew.java Normal file
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package com.baeldung.casting;
public interface Mew {
public void meow();
}

56
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/constructors/BankAccount.java Normal file
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package com.baeldung.constructors;
import java.time.LocalDateTime;
class BankAccount {
String name;
LocalDateTime opened;
double balance;
@Override
public String toString() {
return String.format("%s, %s, %f", this.name, this.opened.toString(), this.balance);
}
public String getName() {
return name;
}
public LocalDateTime getOpened() {
return opened;
}
public double getBalance() {
return this.balance;
}
}
class BankAccountEmptyConstructor extends BankAccount {
public BankAccountEmptyConstructor() {
this.name = "";
this.opened = LocalDateTime.now();
this.balance = 0.0d;
}
}
class BankAccountParameterizedConstructor extends BankAccount {
public BankAccountParameterizedConstructor(String name, LocalDateTime opened, double balance) {
this.name = name;
this.opened = opened;
this.balance = balance;
}
}
class BankAccountCopyConstructor extends BankAccount {
public BankAccountCopyConstructor(String name, LocalDateTime opened, double balance) {
this.name = name;
this.opened = opened;
this.balance = balance;
}
public BankAccountCopyConstructor(BankAccount other) {
this.name = other.name;
this.opened = LocalDateTime.now();
this.balance = 0.0f;
}
}

25
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/constructors/Transaction.java Normal file
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package com.baeldung.constructors;
import java.time.LocalDateTime;
class Transaction {
final BankAccountEmptyConstructor bankAccount;
final LocalDateTime date;
final double amount;
public Transaction(BankAccountEmptyConstructor account, LocalDateTime date, double amount) {
this.bankAccount = account;
this.date = date;
this.amount = amount;
}
/*
* Compilation Error :'(, all final variables must be explicitly initialised.
* public Transaction() {
* }
*/
public void invalidMethod() {
// this.amount = 102.03; // Results in a compiler error. You cannot change the value of a final variable.
}
}

59
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/deepcopy/Address.java Normal file
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package com.baeldung.deepcopy;
import java.io.Serializable;
public class Address implements Serializable, Cloneable {
@Override
public Object clone() {
try {
return (Address) super.clone();
} catch (CloneNotSupportedException e) {
return new Address(this.street, this.getCity(), this.getCountry());
}
}
private static final long serialVersionUID = 1740913841244949416L;
private String street;
private String city;
private String country;
public Address(Address that) {
this(that.getStreet(), that.getCity(), that.getCountry());
}
public Address(String street, String city, String country) {
this.street = street;
this.city = city;
this.country = country;
}
public Address() {
}
public String getStreet() {
return street;
}
public String getCity() {
return city;
}
public String getCountry() {
return country;
}
public void setStreet(String street) {
this.street = street;
}
public void setCity(String city) {
this.city = city;
}
public void setCountry(String country) {
this.country = country;
}
}

48
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/deepcopy/User.java Normal file
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package com.baeldung.deepcopy;
import java.io.Serializable;
public class User implements Serializable, Cloneable {
private static final long serialVersionUID = -3427002229954777557L;
private String firstName;
private String lastName;
private Address address;
public User(String firstName, String lastName, Address address) {
this.firstName = firstName;
this.lastName = lastName;
this.address = address;
}
public User(User that) {
this(that.getFirstName(), that.getLastName(), new Address(that.getAddress()));
}
public User() {
}
@Override
public Object clone() {
User user;
try {
user = (User) super.clone();
} catch (CloneNotSupportedException e) {
user = new User(this.getFirstName(), this.getLastName(), this.getAddress());
}
user.address = (Address) this.address.clone();
return user;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
public Address getAddress() {
return address;
}
}

36
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/Money.java Normal file
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package com.baeldung.equalshashcode;
class Money {
int amount;
String currencyCode;
Money(int amount, String currencyCode) {
this.amount = amount;
this.currencyCode = currencyCode;
}
@Override
public boolean equals(Object o) {
if (o == this)
return true;
if (!(o instanceof Money))
return false;
Money other = (Money)o;
boolean currencyCodeEquals = (this.currencyCode == null && other.currencyCode == null)
|| (this.currencyCode != null && this.currencyCode.equals(other.currencyCode));
return this.amount == other.amount
&& currencyCodeEquals;
}
@Override
public int hashCode() {
int result = 17;
result = 31 * result + amount;
if (currencyCode != null) {
result = 31 * result + currencyCode.hashCode();
}
return result;
}
}

39
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/Team.java Normal file
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package com.baeldung.equalshashcode;
class Team {
final String city;
final String department;
Team(String city, String department) {
this.city = city;
this.department = department;
}
@Override
public final boolean equals(Object o) {
if (o == this)
return true;
if (!(o instanceof Team))
return false;
Team otherTeam = (Team)o;
boolean cityEquals = (this.city == null && otherTeam.city == null)
|| this.city != null && this.city.equals(otherTeam.city);
boolean departmentEquals = (this.department == null && otherTeam.department == null)
|| this.department != null && this.department.equals(otherTeam.department);
return cityEquals && departmentEquals;
}
@Override
public final int hashCode() {
int result = 17;
if (city != null) {
result = 31 * result + city.hashCode();
}
if (department != null) {
result = 31 * result + department.hashCode();
}
return result;
}
}

38
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/Voucher.java Normal file
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package com.baeldung.equalshashcode;
class Voucher {
private Money value;
private String store;
Voucher(int amount, String currencyCode, String store) {
this.value = new Money(amount, currencyCode);
this.store = store;
}
@Override
public boolean equals(Object o) {
if (o == this)
return true;
if (!(o instanceof Voucher))
return false;
Voucher other = (Voucher)o;
boolean valueEquals = (this.value == null && other.value == null)
|| (this.value != null && this.value.equals(other.value));
boolean storeEquals = (this.store == null && other.store == null)
|| (this.store != null && this.store.equals(other.store));
return valueEquals && storeEquals;
}
@Override
public int hashCode() {
int result = 17;
if (this.value != null) {
result = 31 * result + value.hashCode();
}
if (this.store != null) {
result = 31 * result + store.hashCode();
}
return result;
}
}

30
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/WrongTeam.java Normal file
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package com.baeldung.equalshashcode;
/* (non-Javadoc)
* This class overrides equals, but it doesn't override hashCode.
*
* To see which problems this leads to:
* TeamUnitTest.givenMapKeyWithoutHashCode_whenSearched_thenReturnsWrongValue
*/
class WrongTeam {
String city;
String department;
WrongTeam(String city, String department) {
this.city = city;
this.department = department;
}
@Override
public boolean equals(Object o) {
if (o == this)
return true;
if (!(o instanceof WrongTeam))
return false;
WrongTeam otherTeam = (WrongTeam)o;
return this.city == otherTeam.city
&& this.department == otherTeam.department;
}
}

47
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/WrongVoucher.java Normal file
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package com.baeldung.equalshashcode;
/* (non-Javadoc)
* This class extends the Money class that has overridden the equals method and once again overrides the equals method.
*
* To see which problems this leads to:
* MoneyUnitTest.givenMoneyAndVoucherInstances_whenEquals_thenReturnValuesArentSymmetric
*/
class WrongVoucher extends Money {
private String store;
WrongVoucher(int amount, String currencyCode, String store) {
super(amount, currencyCode);
this.store = store;
}
@Override
public boolean equals(Object o) {
if (o == this)
return true;
if (!(o instanceof WrongVoucher))
return false;
WrongVoucher other = (WrongVoucher)o;
boolean currencyCodeEquals = (this.currencyCode == null && other.currencyCode == null)
|| (this.currencyCode != null && this.currencyCode.equals(other.currencyCode));
boolean storeEquals = (this.store == null && other.store == null)
|| (this.store != null && this.store.equals(other.store));
return this.amount == other.amount
&& currencyCodeEquals
&& storeEquals;
}
@Override
public int hashCode() {
int result = 17;
result = 31 * result + amount;
if (this.currencyCode != null) {
result = 31 * result + currencyCode.hashCode();
}
if (this.store != null) {
result = 31 * result + store.hashCode();
}
return result;
}
}

63
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/ComplexClass.java Normal file
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package com.baeldung.equalshashcode.entities;
import java.util.List;
import java.util.Set;
public class ComplexClass {
private List<?> genericList;
private Set<Integer> integerSet;
public ComplexClass(List<?> genericArrayList, Set<Integer> integerHashSet) {
super();
this.genericList = genericArrayList;
this.integerSet = integerHashSet;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((genericList == null) ? 0 : genericList.hashCode());
result = prime * result + ((integerSet == null) ? 0 : integerSet.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof ComplexClass))
return false;
ComplexClass other = (ComplexClass) obj;
if (genericList == null) {
if (other.genericList != null)
return false;
} else if (!genericList.equals(other.genericList))
return false;
if (integerSet == null) {
if (other.integerSet != null)
return false;
} else if (!integerSet.equals(other.integerSet))
return false;
return true;
}
protected List<?> getGenericList() {
return genericList;
}
protected void setGenericArrayList(List<?> genericList) {
this.genericList = genericList;
}
protected Set<Integer> getIntegerSet() {
return integerSet;
}
protected void setIntegerSet(Set<Integer> integerSet) {
this.integerSet = integerSet;
}
}

54
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/PrimitiveClass.java Normal file
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package com.baeldung.equalshashcode.entities;
public class PrimitiveClass {
private boolean primitiveBoolean;
private int primitiveInt;
public PrimitiveClass(boolean primitiveBoolean, int primitiveInt) {
super();
this.primitiveBoolean = primitiveBoolean;
this.primitiveInt = primitiveInt;
}
protected boolean isPrimitiveBoolean() {
return primitiveBoolean;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (primitiveBoolean ? 1231 : 1237);
result = prime * result + primitiveInt;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
PrimitiveClass other = (PrimitiveClass) obj;
if (primitiveBoolean != other.primitiveBoolean)
return false;
if (primitiveInt != other.primitiveInt)
return false;
return true;
}
protected void setPrimitiveBoolean(boolean primitiveBoolean) {
this.primitiveBoolean = primitiveBoolean;
}
protected int getPrimitiveInt() {
return primitiveInt;
}
protected void setPrimitiveInt(int primitiveInt) {
this.primitiveInt = primitiveInt;
}
}

58
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/Rectangle.java Normal file
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package com.baeldung.equalshashcode.entities;
public class Rectangle extends Shape {
private double width;
private double length;
public Rectangle(double width, double length) {
this.width = width;
this.length = length;
}
@Override
public double area() {
return width * length;
}
@Override
public double perimeter() {
return 2 * (width + length);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
long temp;
temp = Double.doubleToLongBits(length);
result = prime * result + (int) (temp ^ (temp >>> 32));
temp = Double.doubleToLongBits(width);
result = prime * result + (int) (temp ^ (temp >>> 32));
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Rectangle other = (Rectangle) obj;
if (Double.doubleToLongBits(length) != Double.doubleToLongBits(other.length))
return false;
if (Double.doubleToLongBits(width) != Double.doubleToLongBits(other.width))
return false;
return true;
}
protected double getWidth() {
return width;
}
protected double getLength() {
return length;
}
}

7
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/Shape.java Normal file
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package com.baeldung.equalshashcode.entities;
public abstract class Shape {
public abstract double area();
public abstract double perimeter();
}

58
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/Square.java Normal file
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package com.baeldung.equalshashcode.entities;
import java.awt.*;
public class Square extends Rectangle {
private Color color;
public Square(double width, Color color) {
super(width, width);
this.color = color;
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
final int prime = 31;
int result = super.hashCode();
result = prime * result + ((color == null) ? 0 : color.hashCode());
return result;
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!super.equals(obj)) {
return false;
}
if (!(obj instanceof Square)) {
return false;
}
Square other = (Square) obj;
if (color == null) {
if (other.color != null) {
return false;
}
} else if (!color.equals(other.color)) {
return false;
}
return true;
}
protected Color getColor() {
return color;
}
protected void setColor(Color color) {
this.color = color;
}
}

5
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/BlackCat.java Normal file
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package com.baeldung.finalkeyword;
public class BlackCat {
}

6
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/BlackDog.java Normal file
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package com.baeldung.finalkeyword;
public class BlackDog extends Dog {
// public void sound() {
// }
}

18
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/Cat.java Normal file
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package com.baeldung.finalkeyword;
public final class Cat {
private int weight;
public int getWeight() {
return weight;
}
public void setWeight(int weight) {
this.weight = weight;
}
public void methodWithFinalArguments(final int x) {
// x=1;
}
}

7
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/Dog.java Normal file
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package com.baeldung.finalkeyword;
public class Dog {
public final void sound() {
}
}

42
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/hashcode/entities/User.java Normal file
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package com.baeldung.hashcode.entities;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class User {
private final Logger logger = LoggerFactory.getLogger(User.class);
private long id;
private String name;
private String email;
public User(long id, String name, String email) {
this.id = id;
this.name = name;
this.email = email;
}
@Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null)
return false;
if (this.getClass() != o.getClass())
return false;
User user = (User) o;
return id == user.id && (name.equals(user.name) && email.equals(user.email));
}
@Override
public int hashCode() {
int hash = 7;
hash = 31 * hash + (int) id;
hash = 31 * hash + (name == null ? 0 : name.hashCode());
hash = 31 * hash + (email == null ? 0 : email.hashCode());
logger.info("hashCode() method called - Computed hash: " + hash);
return hash;
}
// getters and setters here
}

18
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/immutableobjects/Currency.java Normal file
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package com.baeldung.immutableobjects;
public final class Currency {
private final String value;
private Currency(String currencyValue) {
value = currencyValue;
}
public String getValue() {
return value;
}
public static Currency of(String value) {
return new Currency(value);
}
}

20
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/immutableobjects/Money.java Normal file
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package com.baeldung.immutableobjects;
// 4. Immutability in Java
public final class Money {
private final double amount;
private final Currency currency;
public Money(double amount, Currency currency) {
this.amount = amount;
this.currency = currency;
}
public Currency getCurrency() {
return currency;
}
public double getAmount() {
return amount;
}
}

43
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritance/ArmoredCar.java Normal file
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package com.baeldung.inheritance;
public class ArmoredCar extends Car implements Floatable, Flyable{
private int bulletProofWindows;
private String model;
public void remoteStartCar() {
// this vehicle can be started by using a remote control
}
public String registerModel() {
return model;
}
public String getAValue() {
return super.model; // returns value of model defined in base class Car
// return this.model; // will return value of model defined in ArmoredCar
// return model; // will return value of model defined in ArmoredCar
}
public static String msg() {
// return super.msg(); // this won't compile.
return "ArmoredCar";
}
@Override
public void floatOnWater() {
System.out.println("I can float!");
}
@Override
public void fly() {
System.out.println("I can fly!");
}
public void aMethod() {
// System.out.println(duration); // Won't compile
System.out.println(Floatable.duration); // outputs 10
System.out.println(Flyable.duration); // outputs 20
}
}

12
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritance/BMW.java Normal file
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@@ -0,0 +1,12 @@
package com.baeldung.inheritance;
public class BMW extends Car {
public BMW() {
super(5, "BMW");
}
@Override
public String toString() {
return model;
}
}

32
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritance/Car.java Normal file
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package com.baeldung.inheritance;
public class Car {
private final int DEFAULT_WHEEL_COUNT = 5;
private final String DEFAULT_MODEL = "Basic";
protected int wheels;
protected String model;
public Car() {
this.wheels = DEFAULT_WHEEL_COUNT;
this.model = DEFAULT_MODEL;
}
public Car(int wheels, String model) {
this.wheels = wheels;
this.model = model;
}
public void start() {
// Check essential parts
// If okay, start.
}
public static int count = 10;
public static String msg() {
return "Car";
}
public String toString() {
return model;
}
}

15
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritance/Employee.java Normal file
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@@ -0,0 +1,15 @@
package com.baeldung.inheritance;
public class Employee {
private String name;
private Car car;
public Employee(String name, Car car) {
this.name = name;
this.car = car;
}
public Car getCar() {
return car;
}
}

10
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritance/Floatable.java Normal file
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@@ -0,0 +1,10 @@
package com.baeldung.inheritance;
public interface Floatable {
int duration = 10;
void floatOnWater();
default void repair() {
System.out.println("Repairing Floatable object");
}
}

13
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritance/Flyable.java Normal file
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@@ -0,0 +1,13 @@
package com.baeldung.inheritance;
public interface Flyable {
int duration = 10;
void fly();
/*
* Commented
*/
//default void repair() {
// System.out.println("Repairing Flyable object");
//}
}

18
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritance/SpaceCar.java Normal file
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@@ -0,0 +1,18 @@
package com.baeldung.inheritance;
public class SpaceCar extends Car implements SpaceTraveller {
@Override
public void floatOnWater() {
System.out.println("SpaceCar floating!");
}
@Override
public void fly() {
System.out.println("SpaceCar flying!");
}
@Override
public void remoteControl() {
System.out.println("SpaceCar being controlled remotely!");
}
}

6
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritance/SpaceTraveller.java Normal file
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@@ -0,0 +1,6 @@
package com.baeldung.inheritance;
public interface SpaceTraveller extends Floatable, Flyable {
int duration = 10;
void remoteControl();
}

27
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/application/Application.java Normal file
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@@ -0,0 +1,27 @@
package com.baeldung.inheritancecomposition.application;
import com.baeldung.inheritancecomposition.model.Actress;
import com.baeldung.inheritancecomposition.model.Computer;
import com.baeldung.inheritancecomposition.model.StandardMemory;
import com.baeldung.inheritancecomposition.model.Person;
import com.baeldung.inheritancecomposition.model.StandardProcessor;
import com.baeldung.inheritancecomposition.model.StandardSoundCard;
import com.baeldung.inheritancecomposition.model.Waitress;
public class Application {
public static void main(String[] args) {
Person person = new Person("John", "john@domain.com", 35);
Waitress waitress = new Waitress("Mary", "mary@domain.com", 22);
System.out.println(waitress.serveStarter("mixed salad"));
System.out.println(waitress.serveMainCourse("steak"));
System.out.println(waitress.serveDessert("cup of cofee"));
Actress actress = new Actress("Susan", "susan@domain.com", 30);
System.out.println(actress.readScript("Psycho"));
System.out.println(actress.performRole());
Computer computer = new Computer(new StandardProcessor("Intel I3"), new StandardMemory("Kingston", "1TB"));
computer.setSoundCard(new StandardSoundCard("Generic Sound Card"));
System.out.println(computer);
}
}

16
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Actress.java Normal file
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@@ -0,0 +1,16 @@
package com.baeldung.inheritancecomposition.model;
public class Actress extends Person {
public Actress(String name, String email, int age) {
super(name, email, age);
}
public String readScript(String movie) {
return "Reading the script of " + movie;
}
public String performRole() {
return "Performing a role";
}
}

36
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Computer.java Normal file
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@@ -0,0 +1,36 @@
package com.baeldung.inheritancecomposition.model;
import java.util.Optional;
public class Computer {
private Processor processor;
private Memory memory;
private SoundCard soundCard;
public Computer(Processor processor, Memory memory) {
this.processor = processor;
this.memory = memory;
}
public void setSoundCard(SoundCard soundCard) {
this.soundCard = soundCard;
}
public Processor getProcessor() {
return processor;
}
public Memory getMemory() {
return memory;
}
public Optional<SoundCard> getSoundCard() {
return Optional.ofNullable(soundCard);
}
@Override
public String toString() {
return "Computer{" + "processor=" + processor + ", memory=" + memory + ", soundcard=" + soundCard +"}";
}
}

8
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Memory.java Normal file
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@@ -0,0 +1,8 @@
package com.baeldung.inheritancecomposition.model;
public interface Memory {
String getBrand();
String getSize();
}

31
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Person.java Normal file
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@@ -0,0 +1,31 @@
package com.baeldung.inheritancecomposition.model;
public class Person {
private final String name;
private final String email;
private final int age;
public Person(String name, String email, int age) {
this.name = name;
this.email = email;
this.age = age;
}
public String getName() {
return name;
}
public String getEmail() {
return email;
}
public int getAge() {
return age;
}
@Override
public String toString() {
return "Person{" + "name=" + name + ", email=" + email + ", age=" + age + "}";
}
}

6
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Processor.java Normal file
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@@ -0,0 +1,6 @@
package com.baeldung.inheritancecomposition.model;
public interface Processor {
String getModel();
}

6
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/SoundCard.java Normal file
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@@ -0,0 +1,6 @@
package com.baeldung.inheritancecomposition.model;
public interface SoundCard {
String getBrand();
}

25
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/StandardMemory.java Normal file
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@@ -0,0 +1,25 @@
package com.baeldung.inheritancecomposition.model;
public class StandardMemory implements Memory {
private String brand;
private String size;
public StandardMemory(String brand, String size) {
this.brand = brand;
this.size = size;
}
public String getBrand() {
return brand;
}
public String getSize() {
return size;
}
@Override
public String toString() {
return "Memory{" + "brand=" + brand + ", size=" + size + "}";
}
}

20
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/StandardProcessor.java Normal file
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@@ -0,0 +1,20 @@
package com.baeldung.inheritancecomposition.model;
public class StandardProcessor implements Processor {
private String model;
public StandardProcessor(String model) {
this.model = model;
}
@Override
public String getModel() {
return model;
}
@Override
public String toString() {
return "Processor{" + "model=" + model + "}";
}
}

20
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/StandardSoundCard.java Normal file
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@@ -0,0 +1,20 @@
package com.baeldung.inheritancecomposition.model;
public class StandardSoundCard implements SoundCard {
private String brand;
public StandardSoundCard(String brand) {
this.brand = brand;
}
@Override
public String getBrand() {
return brand;
}
@Override
public String toString() {
return "SoundCard{" + "brand=" + brand + "}";
}
}

20
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Waitress.java Normal file
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@@ -0,0 +1,20 @@
package com.baeldung.inheritancecomposition.model;
public class Waitress extends Person {
public Waitress(String name, String email, int age) {
super(name, email, age);
}
public String serveStarter(String starter) {
return "Serving a " + starter;
}
public String serveMainCourse(String mainCourse) {
return "Serving a " + mainCourse;
}
public String serveDessert(String dessert) {
return "Serving a " + dessert;
}
}

53
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/initializationguide/User.java Normal file
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@@ -0,0 +1,53 @@
package com.baeldung.initializationguide;
import java.io.Serializable;
public class User implements Serializable, Cloneable {
private static final long serialVersionUID = 1L;
static String forum;
private String name;
private int id;
{
id = 0;
System.out.println("Instance Initializer");
}
static {
forum = "Java";
System.out.println("Static Initializer");
}
public User(String name, int id) {
super();
this.name = name;
this.id = id;
}
public User() {
System.out.println("Constructor");
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Override
protected Object clone() throws CloneNotSupportedException {
return this;
}
}

16
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/keyword/KeywordDemo.java Normal file
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@@ -0,0 +1,16 @@
package com.baeldung.keyword;
import com.baeldung.keyword.superkeyword.SuperSub;
import com.baeldung.keyword.thiskeyword.KeywordUnitTest;
/**
* Created by Gebruiker on 5/14/2018.
*/
public class KeywordDemo {
public static void main(String[] args) {
KeywordUnitTest keyword = new KeywordUnitTest();
SuperSub child = new SuperSub("message from the child class");
}
}

20
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/keyword/superkeyword/SuperBase.java Normal file
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@@ -0,0 +1,20 @@
package com.baeldung.keyword.superkeyword;
/**
* Created by Gebruiker on 5/14/2018.
*/
public class SuperBase {
String message = "super class";
public SuperBase() {
}
public SuperBase(String message) {
this.message = message;
}
public void printMessage() {
System.out.println(message);
}
}

26
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/keyword/superkeyword/SuperSub.java Normal file
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@@ -0,0 +1,26 @@
package com.baeldung.keyword.superkeyword;
/**
* Created by Gebruiker on 5/15/2018.
*/
public class SuperSub extends SuperBase {
String message = "child class";
public SuperSub(String message) {
super(message);
}
public SuperSub() {
super.printMessage();
printMessage();
}
public void getParentMessage() {
System.out.println(super.message);
}
public void printMessage() {
System.out.println(message);
}
}

49
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/keyword/thiskeyword/KeywordUnitTest.java Normal file
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@@ -0,0 +1,49 @@
package com.baeldung.keyword.thiskeyword;
public class KeywordUnitTest {
private String name;
private int age;
public KeywordUnitTest() {
this("John", 27);
this.printMessage();
printInstance(this);
}
public KeywordUnitTest(String name, int age) {
this.name = name;
this.age = age;
}
public void printMessage() {
System.out.println("invoked by this");
}
public void printInstance(KeywordUnitTest thisKeyword) {
System.out.println(thisKeyword);
}
public KeywordUnitTest getCurrentInstance() {
return this;
}
class ThisInnerClass {
boolean isInnerClass = true;
public ThisInnerClass() {
KeywordUnitTest thisKeyword = KeywordUnitTest.this;
String outerString = KeywordUnitTest.this.name;
System.out.println(this.isInnerClass);
}
}
@Override
public String toString() {
return "KeywordTest{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
}

5
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/DeletableShape.java Normal file
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@@ -0,0 +1,5 @@
package com.baeldung.markerinterface;
public interface DeletableShape extends Shape {
}

22
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/Rectangle.java Normal file
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@@ -0,0 +1,22 @@
package com.baeldung.markerinterface;
public class Rectangle implements DeletableShape {
private double width;
private double height;
public Rectangle(double width, double height) {
this.width = width;
this.height = height;
}
@Override
public double getArea() {
return width * height;
}
@Override
public double getCircumference() {
return 2 * (width + height);
}
}

6
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/Shape.java Normal file
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@@ -0,0 +1,6 @@
package com.baeldung.markerinterface;
public interface Shape {
double getArea();
double getCircumference();
}

14
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/ShapeDao.java Normal file
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@@ -0,0 +1,14 @@
package com.baeldung.markerinterface;
public class ShapeDao {
public boolean delete(Object object) {
if (!(object instanceof DeletableShape)) {
return false;
}
// Calling the code that deletes the entity from the database
return true;
}
}

26
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/methodoverloadingoverriding/application/Application.java Normal file
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@@ -0,0 +1,26 @@
package com.baeldung.methodoverloadingoverriding.application;
import com.baeldung.methodoverloadingoverriding.model.Car;
import com.baeldung.methodoverloadingoverriding.model.Vehicle;
import com.baeldung.methodoverloadingoverriding.util.Multiplier;
public class Application {
public static void main(String[] args) {
Multiplier multiplier = new Multiplier();
System.out.println(multiplier.multiply(10, 10));
System.out.println(multiplier.multiply(10, 10, 10));
System.out.println(multiplier.multiply(10, 10.5));
System.out.println(multiplier.multiply(10.5, 10.5));
Vehicle vehicle = new Vehicle();
System.out.println(vehicle.accelerate(100));
System.out.println(vehicle.run());
System.out.println(vehicle.stop());
Vehicle car = new Car();
System.out.println(car.accelerate(80));
System.out.println(car.run());
System.out.println(car.stop());
}
}

9
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/methodoverloadingoverriding/model/Car.java Normal file
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@@ -0,0 +1,9 @@
package com.baeldung.methodoverloadingoverriding.model;
public class Car extends Vehicle {
@Override
public String accelerate(long mph) {
return "The car accelerates at : " + mph + " MPH.";
}
}

16
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/methodoverloadingoverriding/model/Vehicle.java Normal file
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@@ -0,0 +1,16 @@
package com.baeldung.methodoverloadingoverriding.model;
public class Vehicle {
public String accelerate(long mph) {
return "The vehicle accelerates at : " + mph + " MPH.";
}
public String stop() {
return "The vehicle has stopped.";
}
public String run() {
return "The vehicle is running.";
}
}

16
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/methodoverloadingoverriding/util/Multiplier.java Normal file
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@@ -0,0 +1,16 @@
package com.baeldung.methodoverloadingoverriding.util;
public class Multiplier {
public int multiply(int a, int b) {
return a * b;
}
public int multiply(int a, int b, int c) {
return a * b * c;
}
public double multiply(double a, double b) {
return a * b;
}
}

38
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/polymorphism/FileManager.java Normal file
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@@ -0,0 +1,38 @@
package com.baeldung.polymorphism;
import java.awt.image.BufferedImage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class FileManager {
final static Logger logger = LoggerFactory.getLogger(FileManager.class);
public static void main(String[] args) {
GenericFile file1 = new TextFile("SampleTextFile", "This is a sample text content", "v1.0.0");
logger.info("File Info: \n" + file1.getFileInfo() + "\n");
ImageFile imageFile = new ImageFile("SampleImageFile", 200, 100, new BufferedImage(100, 200, BufferedImage.TYPE_INT_RGB).toString()
.getBytes(), "v1.0.0");
logger.info("File Info: \n" + imageFile.getFileInfo());
}
public static ImageFile createImageFile(String name, int height, int width, byte[] content, String version) {
ImageFile imageFile = new ImageFile(name, height, width, content, version);
logger.info("File 2 Info: \n" + imageFile.getFileInfo());
return imageFile;
}
public static GenericFile createTextFile(String name, String content, String version) {
GenericFile file1 = new TextFile(name, content, version);
logger.info("File 1 Info: \n" + file1.getFileInfo() + "\n");
return file1;
}
public static TextFile createTextFile2(String name, String content, String version) {
TextFile file1 = new TextFile(name, content, version);
logger.info("File 1 Info: \n" + file1.getFileInfo() + "\n");
return file1;
}
}

63
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/polymorphism/GenericFile.java Normal file
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@@ -0,0 +1,63 @@
package com.baeldung.polymorphism;
import java.util.Date;
public class GenericFile {
private String name;
private String extension;
private Date dateCreated;
private String version;
private byte[] content;
public GenericFile() {
this.setDateCreated(new Date());
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getExtension() {
return extension;
}
public void setExtension(String extension) {
this.extension = extension;
}
public Date getDateCreated() {
return dateCreated;
}
public void setDateCreated(Date dateCreated) {
this.dateCreated = dateCreated;
}
public String getVersion() {
return version;
}
public void setVersion(String version) {
this.version = version;
}
public byte[] getContent() {
return content;
}
public void setContent(byte[] content) {
this.content = content;
}
public String getFileInfo() {
return "Generic File Impl";
}
public Object read() {
return content;
}
}

41
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/polymorphism/ImageFile.java Normal file
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@@ -0,0 +1,41 @@
package com.baeldung.polymorphism;
public class ImageFile extends GenericFile {
private int height;
private int width;
public ImageFile(String name, int height, int width, byte[] content, String version) {
this.setHeight(height);
this.setWidth(width);
this.setContent(content);
this.setName(name);
this.setVersion(version);
this.setExtension(".jpg");
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public String getFileInfo() {
return "Image File Impl";
}
public String read() {
return this.getContent()
.toString();
}
}

44
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/polymorphism/TextFile.java Normal file
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@@ -0,0 +1,44 @@
package com.baeldung.polymorphism;
public class TextFile extends GenericFile {
private int wordCount;
public TextFile(String name, String content, String version) {
String[] words = content.split(" ");
this.setWordCount(words.length > 0 ? words.length : 1);
this.setContent(content.getBytes());
this.setName(name);
this.setVersion(version);
this.setExtension(".txt");
}
public int getWordCount() {
return wordCount;
}
public void setWordCount(int wordCount) {
this.wordCount = wordCount;
}
public String getFileInfo() {
return "Text File Impl";
}
public String read() {
return this.getContent()
.toString();
}
public String read(int limit) {
return this.getContent()
.toString()
.substring(0, limit);
}
public String read(int start, int stop) {
return this.getContent()
.toString()
.substring(start, stop);
}
}

9
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/scope/method/BaseMethodClass.java Normal file
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@@ -0,0 +1,9 @@
package com.baeldung.scope.method;
public class BaseMethodClass {
public static void printMessage() {
System.out.println("base static method");
}
}

9
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/scope/method/ChildMethodClass.java Normal file
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@@ -0,0 +1,9 @@
package com.baeldung.scope.method;
public class ChildMethodClass extends BaseMethodClass {
public static void printMessage() {
System.out.println("child static method");
}
}

8
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/scope/method/MethodHidingDemo.java Normal file
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@@ -0,0 +1,8 @@
package com.baeldung.scope.method;
public class MethodHidingDemo {
public static void main(String[] args) {
ChildMethodClass.printMessage();
}
}

13
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/scope/variable/ChildVariable.java Normal file
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package com.baeldung.scope.variable;
/**
* Created by Gebruiker on 5/7/2018.
*/
public class ChildVariable extends ParentVariable {
String instanceVariable = "child variable";
public void printInstanceVariable() {
System.out.println(instanceVariable);
}
}

23
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/scope/variable/HideVariable.java Normal file
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package com.baeldung.scope.variable;
/**
* Created by Gebruiker on 5/6/2018.
*/
public class HideVariable {
private String message = "this is instance variable";
HideVariable() {
String message = "constructor local variable";
System.out.println(message);
}
public void printLocalVariable() {
String message = "method local variable";
System.out.println(message);
}
public void printInstanceVariable() {
System.out.println(this.message);
}
}

13
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/scope/variable/ParentVariable.java Normal file
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package com.baeldung.scope.variable;
/**
* Created by Gebruiker on 5/7/2018.
*/
public class ParentVariable {
String instanceVariable = "parent variable";
public void printInstanceVariable() {
System.out.println(instanceVariable);
}
}

18
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/scope/variable/VariableHidingDemo.java Normal file
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package com.baeldung.scope.variable;
/**
* Created by Gebruiker on 5/6/2018.
*/
public class VariableHidingDemo {
public static void main(String[] args) {
HideVariable variable = new HideVariable();
variable.printLocalVariable();
variable.printInstanceVariable();
ParentVariable parentVariable = new ParentVariable();
ParentVariable childVariable = new ChildVariable();
parentVariable.printInstanceVariable();
childVariable.printInstanceVariable();
}
}

48
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/staticdemo/Car.java Normal file
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package com.baeldung.staticdemo;
/**
* This class demonstrates the use of static fields and static methods
* the instance variables engine and displacement are distinct for
* each and every object whereas static/class variable numberOfCars
* is unique and is shared across all objects of this class.
*
* @author baeldung
*
*/
public class Car {
private String name;
private String engine;
public static int numberOfCars;
public Car(String name, String engine) {
this.name = name;
this.engine = engine;
numberOfCars++;
}
//getters and setters
public static int getNumberOfCars() {
return numberOfCars;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEngine() {
return engine;
}
public void setEngine(String engine) {
this.engine = engine;
}
public static void setNumberOfCars(int numberOfCars) {
Car.numberOfCars = numberOfCars;
}
}

13
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/staticdemo/Singleton.java Normal file
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package com.baeldung.staticdemo;
public class Singleton {
private Singleton() {}
private static class SingletonHolder {
public static final Singleton instance = new Singleton();
}
public static Singleton getInstance() {
return SingletonHolder.instance;
}
}

28
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/staticdemo/StaticBlock.java Normal file
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package com.baeldung.staticdemo;
import java.util.LinkedList;
import java.util.List;
public class StaticBlock {
private static List<String> ranks = new LinkedList<>();
static {
ranks.add("Lieutenant");
ranks.add("Captain");
ranks.add("Major");
}
static {
ranks.add("Colonel");
ranks.add("General");
}
//getters and setters
public static List<String> getRanks() {
return ranks;
}
public static void setRanks(List<String> ranks) {
StaticBlock.ranks = ranks;
}
}

16
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/typeerasure/ArrayContentPrintUtil.java Normal file
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package com.baeldung.typeerasure;
public class ArrayContentPrintUtil {
public static <E> void printArray(E[] array) {
for (E element : array) {
System.out.printf("%s ", element);
}
}
public static <E extends Comparable<E>> void printArray(E[] array) {
for (E element : array) {
System.out.printf("%s ", element);
}
}
}

37
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/typeerasure/BoundStack.java Normal file
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package com.baeldung.typeerasure;
import java.util.Arrays;
public class BoundStack<E extends Comparable<E>> {
private E[] stackContent;
private int total;
public BoundStack(int capacity) {
this.stackContent = (E[]) new Object[capacity];
}
public void push(E data) {
if (total == stackContent.length) {
resize(2 * stackContent.length);
}
stackContent[total++] = data;
}
public E pop() {
if (!isEmpty()) {
E datum = stackContent[total];
stackContent[total--] = null;
return datum;
}
return null;
}
private void resize(int capacity) {
Arrays.copyOf(stackContent, capacity);
}
public boolean isEmpty() {
return total == 0;
}
}

13
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/typeerasure/IntegerStack.java Normal file
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package com.baeldung.typeerasure;
public class IntegerStack extends Stack<Integer> {
public IntegerStack(int capacity) {
super(capacity);
}
public void push(Integer value) {
System.out.println("Pushing into my integerStack");
super.push(value);
}
}

39
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/typeerasure/Stack.java Normal file
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package com.baeldung.typeerasure;
import java.util.Arrays;
public class Stack<E> {
private E[] stackContent;
private int total;
public Stack(int capacity) {
this.stackContent = (E[]) new Object[capacity];
}
public void push(E data) {
System.out.println("In base stack push#");
if (total == stackContent.length) {
resize(2 * stackContent.length);
}
stackContent[total++] = data;
}
public E pop() {
if (!isEmpty()) {
E datum = stackContent[total];
stackContent[total--] = null;
return datum;
}
return null;
}
private void resize(int capacity) {
Arrays.copyOf(stackContent, capacity);
}
public boolean isEmpty() {
return total == 0;
}
}

19
core-java-modules/core-java-lang-oop/src/main/resources/logback.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<logger name="org.springframework" level="WARN" />
<logger name="org.springframework.transaction" level="WARN" />
<!-- in order to debug some marshalling issues, this needs to be TRACE -->
<logger name="org.springframework.web.servlet.mvc" level="WARN" />
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

80
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/casting/CastingUnitTest.java Normal file
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package com.baeldung.casting;
import org.junit.Test;
import static org.junit.Assert.*;
import java.util.ArrayList;
import java.util.List;
public class CastingUnitTest {
@Test
public void whenPrimitiveConverted_thenValueChanged() {
double myDouble = 1.1;
int myInt = (int) myDouble;
assertNotEquals(myDouble, myInt);
}
@Test
public void whenUpcast_thenInstanceUnchanged() {
Cat cat = new Cat();
Animal animal = cat;
animal = (Animal) cat;
assertTrue(animal instanceof Cat);
}
@Test
public void whenUpcastToObject_thenInstanceUnchanged() {
Object object = new Animal();
assertTrue(object instanceof Animal);
}
@Test
public void whenUpcastToInterface_thenInstanceUnchanged() {
Mew mew = new Cat();
assertTrue(mew instanceof Cat);
}
@Test
public void whenUpcastToAnimal_thenOverridenMethodsCalled() {
List<Animal> animals = new ArrayList<>();
animals.add(new Cat());
animals.add(new Dog());
new AnimalFeeder().feed(animals);
}
@Test
public void whenDowncastToCat_thenMeowIsCalled() {
Animal animal = new Cat();
((Cat) animal).meow();
}
@Test(expected = ClassCastException.class)
public void whenDownCastWithoutCheck_thenExceptionThrown() {
List<Animal> animals = new ArrayList<>();
animals.add(new Cat());
animals.add(new Dog());
new AnimalFeeder().uncheckedFeed(animals);
}
@Test
public void whenDowncastToCatWithCastMethod_thenMeowIsCalled() {
Animal animal = new Cat();
if (Cat.class.isInstance(animal)) {
Cat cat = Cat.class.cast(animal);
cat.meow();
}
}
@Test
public void whenParameterCat_thenOnlyCatsFed() {
List<Animal> animals = new ArrayList<>();
animals.add(new Cat());
animals.add(new Dog());
AnimalFeederGeneric<Cat> catFeeder = new AnimalFeederGeneric<Cat>(Cat.class);
List<Cat> fedAnimals = catFeeder.feed(animals);
assertTrue(fedAnimals.size() == 1);
assertTrue(fedAnimals.get(0) instanceof Cat);
}
}

53
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java Normal file
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package com.baeldung.constructors;
import com.baeldung.constructors.*;
import java.util.logging.Logger;
import java.time.LocalDateTime;
import java.time.Month;
import org.junit.Test;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatCode;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
public class ConstructorUnitTest {
final static Logger LOGGER = Logger.getLogger(ConstructorUnitTest.class.getName());
@Test
public void givenNoExplicitContructor_whenUsed_thenFails() {
BankAccount account = new BankAccount();
assertThatThrownBy(() -> { account.toString(); }).isInstanceOf(Exception.class);
}
@Test
public void givenNoArgumentConstructor_whenUsed_thenSucceeds() {
BankAccountEmptyConstructor account = new BankAccountEmptyConstructor();
assertThatCode(() -> {
account.toString();
}).doesNotThrowAnyException();
}
@Test
public void givenParameterisedConstructor_whenUsed_thenSucceeds() {
LocalDateTime opened = LocalDateTime.of(2018, Month.JUNE, 29, 06, 30, 00);
BankAccountParameterizedConstructor account =
new BankAccountParameterizedConstructor("Tom", opened, 1000.0f);
assertThatCode(() -> {
account.toString();
}).doesNotThrowAnyException();
}
@Test
public void givenCopyContructor_whenUser_thenMaintainsLogic() {
LocalDateTime opened = LocalDateTime.of(2018, Month.JUNE, 29, 06, 30, 00);
BankAccountCopyConstructor account = new BankAccountCopyConstructor("Tim", opened, 1000.0f);
BankAccountCopyConstructor newAccount = new BankAccountCopyConstructor(account);
assertThat(account.getName()).isEqualTo(newAccount.getName());
assertThat(account.getOpened()).isNotEqualTo(newAccount.getOpened());
assertThat(newAccount.getBalance()).isEqualTo(0.0f);
}
}

128
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/deepcopy/DeepCopyUnitTest.java Normal file
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package com.baeldung.deepcopy;
import static org.assertj.core.api.Assertions.assertThat;
import java.io.IOException;
import org.apache.commons.lang3.SerializationUtils;
import org.junit.Ignore;
import org.junit.Test;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
public class DeepCopyUnitTest {
@Test
public void whenCreatingDeepCopyWithCopyConstructor_thenObjectsShouldNotBeSame() {
Address address = new Address("Downing St 10", "London", "England");
User pm = new User("Prime", "Minister", address);
User deepCopy = new User(pm);
assertThat(deepCopy).isNotSameAs(pm);
}
@Test
public void whenModifyingOriginalObject_thenConstructorCopyShouldNotChange() {
Address address = new Address("Downing St 10", "London", "England");
User pm = new User("Prime", "Minister", address);
User deepCopy = new User(pm);
address.setCountry("Great Britain");
assertThat(deepCopy.getAddress().getCountry()).isNotEqualTo(pm.getAddress().getCountry());
}
@Test
public void whenModifyingOriginalObject_thenCloneCopyShouldNotChange() {
Address address = new Address("Downing St 10", "London", "England");
User pm = new User("Prime", "Minister", address);
User deepCopy = (User) pm.clone();
address.setCountry("Great Britain");
assertThat(deepCopy.getAddress().getCountry()).isNotEqualTo(pm.getAddress().getCountry());
}
@Test
public void whenModifyingOriginalObject_thenCommonsCloneShouldNotChange() {
Address address = new Address("Downing St 10", "London", "England");
User pm = new User("Prime", "Minister", address);
User deepCopy = (User) SerializationUtils.clone(pm);
address.setCountry("Great Britain");
assertThat(deepCopy.getAddress().getCountry()).isNotEqualTo(pm.getAddress().getCountry());
}
@Test
public void whenModifyingOriginalObject_thenGsonCloneShouldNotChange() {
Address address = new Address("Downing St 10", "London", "England");
User pm = new User("Prime", "Minister", address);
Gson gson = new Gson();
User deepCopy = gson.fromJson(gson.toJson(pm), User.class);
address.setCountry("Great Britain");
assertThat(deepCopy.getAddress().getCountry()).isNotEqualTo(pm.getAddress().getCountry());
}
@Test
public void whenModifyingOriginalObject_thenJacksonCopyShouldNotChange() throws IOException {
Address address = new Address("Downing St 10", "London", "England");
User pm = new User("Prime", "Minister", address);
ObjectMapper objectMapper = new ObjectMapper();
User deepCopy = objectMapper.readValue(objectMapper.writeValueAsString(pm), User.class);
address.setCountry("Great Britain");
assertThat(deepCopy.getAddress().getCountry()).isNotEqualTo(pm.getAddress().getCountry());
}
@Test
@Ignore
public void whenMakingCopies_thenShowHowLongEachMethodTakes() throws CloneNotSupportedException, IOException {
int times = 1000000;
Address address = new Address("Downing St 10", "London", "England");
User pm = new User("Prime", "Minister", address);
long start = System.currentTimeMillis();
for (int i = 0; i < times; i++) {
User primeMinisterClone = (User) SerializationUtils.clone(pm);
}
long end = System.currentTimeMillis();
System.out.println("Cloning with Apache Commons Lang took " + (end - start) + " milliseconds.");
start = System.currentTimeMillis();
Gson gson = new Gson();
for (int i = 0; i < times; i++) {
User primeMinisterClone = gson.fromJson(gson.toJson(pm), User.class);
}
end = System.currentTimeMillis();
System.out.println("Cloning with Gson took " + (end - start) + " milliseconds.");
start = System.currentTimeMillis();
for (int i = 0; i < times; i++) {
User primeMinisterClone = new User(pm);
}
end = System.currentTimeMillis();
System.out.println("Cloning with the copy constructor took " + (end - start) + " milliseconds.");
start = System.currentTimeMillis();
for (int i = 0; i < times; i++) {
User primeMinisterClone = (User) pm.clone();
}
end = System.currentTimeMillis();
System.out.println("Cloning with Cloneable interface took " + (end - start) + " milliseconds.");
start = System.currentTimeMillis();
ObjectMapper objectMapper = new ObjectMapper();
for (int i = 0; i < times; i++) {
User primeMinisterClone = objectMapper.readValue(objectMapper.writeValueAsString(pm), User.class);
}
end = System.currentTimeMillis();
System.out.println("Cloning with Jackson took " + (end - start) + " milliseconds.");
}
}

33
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/deepcopy/ShallowCopyUnitTest.java Normal file
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package com.baeldung.deepcopy;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class ShallowCopyUnitTest {
@Test
public void whenShallowCopying_thenObjectsShouldNotBeSame() {
Address address = new Address("Downing St 10", "London", "England");
User pm = new User("Prime", "Minister", address);
User shallowCopy = new User(pm.getFirstName(), pm.getLastName(), pm.getAddress());
assertThat(shallowCopy)
.isNotSameAs(pm);
}
@Test
public void whenModifyingOriginalObject_thenCopyShouldChange() {
Address address = new Address("Downing St 10", "London", "England");
User pm = new User("Prime", "Minister", address);
User shallowCopy = new User(pm.getFirstName(), pm.getLastName(), pm.getAddress());
address.setCountry("Great Britain");
assertThat(shallowCopy.getAddress().getCountry())
.isEqualTo(pm.getAddress().getCountry());
}
}

27
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/MoneyUnitTest.java Normal file
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package com.baeldung.equalshashcode;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;
import org.junit.Test;
public class MoneyUnitTest {
@Test
public void givenMoneyInstancesWithSameAmountAndCurrency_whenEquals_thenReturnsTrue() {
Money income = new Money(55, "USD");
Money expenses = new Money(55, "USD");
assertTrue(income.equals(expenses));
}
@Test
public void givenMoneyAndVoucherInstances_whenEquals_thenReturnValuesArentSymmetric() {
Money cash = new Money(42, "USD");
WrongVoucher voucher = new WrongVoucher(42, "USD", "Amazon");
assertFalse(voucher.equals(cash));
assertTrue(cash.equals(voucher));
}
}

46
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/TeamUnitTest.java Normal file
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package com.baeldung.equalshashcode;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import java.util.HashMap;
import java.util.Map;
import org.junit.Test;
import nl.jqno.equalsverifier.EqualsVerifier;
public class TeamUnitTest {
@Test
public void givenMapKeyWithHashCode_whenSearched_thenReturnsCorrectValue() {
Map<Team,String> leaders = new HashMap<>();
leaders.put(new Team("New York", "development"), "Anne");
leaders.put(new Team("Boston", "development"), "Brian");
leaders.put(new Team("Boston", "marketing"), "Charlie");
Team myTeam = new Team("New York", "development");
String myTeamleader = leaders.get(myTeam);
assertEquals("Anne", myTeamleader);
}
@Test
public void givenMapKeyWithoutHashCode_whenSearched_thenReturnsWrongValue() {
Map<WrongTeam,String> leaders = new HashMap<>();
leaders.put(new WrongTeam("New York", "development"), "Anne");
leaders.put(new WrongTeam("Boston", "development"), "Brian");
leaders.put(new WrongTeam("Boston", "marketing"), "Charlie");
WrongTeam myTeam = new WrongTeam("New York", "development");
String myTeamleader = leaders.get(myTeam);
assertFalse("Anne".equals(myTeamleader));
}
@Test
public void equalsContract() {
EqualsVerifier.forClass(Team.class).verify();
}
}

35
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/entities/ComplexClassUnitTest.java Normal file
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package com.baeldung.equalshashcode.entities;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import org.junit.Assert;
import org.junit.Test;
import com.baeldung.equalshashcode.entities.ComplexClass;
public class ComplexClassUnitTest {
@Test
public void testEqualsAndHashcodes() {
List<String> strArrayList = new ArrayList<String>();
strArrayList.add("abc");
strArrayList.add("def");
ComplexClass aObject = new ComplexClass(strArrayList, new HashSet<Integer>(45, 67));
ComplexClass bObject = new ComplexClass(strArrayList, new HashSet<Integer>(45, 67));
List<String> strArrayListD = new ArrayList<String>();
strArrayListD.add("lmn");
strArrayListD.add("pqr");
ComplexClass dObject = new ComplexClass(strArrayListD, new HashSet<Integer>(45, 67));
Assert.assertTrue(aObject.equals(bObject) && bObject.equals(aObject));
Assert.assertTrue(aObject.hashCode() == bObject.hashCode());
Assert.assertFalse(aObject.equals(dObject));
Assert.assertFalse(aObject.hashCode() == dObject.hashCode());
}
}

23
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/entities/PrimitiveClassUnitTest.java Normal file
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package com.baeldung.equalshashcode.entities;
import org.junit.Assert;
import org.junit.Test;
public class PrimitiveClassUnitTest {
@Test
public void testTwoEqualsObjects() {
PrimitiveClass aObject = new PrimitiveClass(false, 2);
PrimitiveClass bObject = new PrimitiveClass(false, 2);
PrimitiveClass dObject = new PrimitiveClass(true, 2);
Assert.assertTrue(aObject.equals(bObject) && bObject.equals(aObject));
Assert.assertTrue(aObject.hashCode() == bObject.hashCode());
Assert.assertFalse(aObject.equals(dObject));
Assert.assertFalse(aObject.hashCode() == dObject.hashCode());
}
}

27
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/entities/SquareClassUnitTest.java Normal file
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package com.baeldung.equalshashcode.entities;
import java.awt.Color;
import org.junit.Assert;
import org.junit.Test;
import com.baeldung.equalshashcode.entities.Square;
public class SquareClassUnitTest {
@Test
public void testEqualsAndHashcodes() {
Square aObject = new Square(10, Color.BLUE);
Square bObject = new Square(10, Color.BLUE);
Square dObject = new Square(20, Color.BLUE);
Assert.assertTrue(aObject.equals(bObject) && bObject.equals(aObject));
Assert.assertTrue(aObject.hashCode() == bObject.hashCode());
Assert.assertFalse(aObject.equals(dObject));
Assert.assertFalse(aObject.hashCode() == dObject.hashCode());
}
}

33
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/finalkeyword/FinalUnitTest.java Normal file
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package com.baeldung.finalkeyword;
import org.junit.Test;
import static org.junit.Assert.*;
public class FinalUnitTest {
@Test
public void whenChangedFinalClassProperties_thenChanged() {
Cat cat = new Cat();
cat.setWeight(1);
assertEquals(1, cat.getWeight());
}
@Test
public void whenFinalVariableAssign_thenOnlyOnce() {
final int i;
i = 1;
// i=2;
}
@Test
public void whenChangedFinalReference_thenChanged() {
final Cat cat = new Cat();
// cat=new Cat();
cat.setWeight(5);
assertEquals(5, cat.getWeight());
}
}

26
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/hashcode/application/ApplicationUnitTest.java Normal file
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package com.baeldung.hashcode.application;
import com.baeldung.hashcode.entities.User;
import org.junit.Test;
import java.util.HashMap;
import java.util.Map;
import static org.junit.Assert.assertTrue;
public class ApplicationUnitTest {
@Test
public void main_NoInputState_TextPrintedToConsole() throws Exception {
Map<User, User> users = new HashMap<>();
User user1 = new User(1L, "John", "john@domain.com");
User user2 = new User(2L, "Jennifer", "jennifer@domain.com");
User user3 = new User(3L, "Mary", "mary@domain.com");
users.put(user1, user1);
users.put(user2, user2);
users.put(user3, user3);
assertTrue(users.containsKey(user1));
}
}

34
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/hashcode/entities/UserUnitTest.java Normal file
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package com.baeldung.hashcode.entities;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
public class UserUnitTest {
private User user;
private User comparisonUser;
@Before
public void setUpUserInstances() {
this.user = new User(1L, "test", "test@domain.com");
this.comparisonUser = this.user;
}
@After
public void tearDownUserInstances() {
user = null;
comparisonUser = null;
}
@Test
public void equals_EqualUserInstance_TrueAssertion() {
Assert.assertTrue(user.equals(comparisonUser));
}
@Test
public void hashCode_UserHash_TrueAssertion() {
Assert.assertEquals(1792276941, user.hashCode());
}
}

36
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/immutableobjects/ImmutableObjectsUnitTest.java Normal file
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package com.baeldung.immutableobjects;
import static org.junit.Assert.assertEquals;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
public class ImmutableObjectsUnitTest {
@Test
public void whenCallingStringReplace_thenStringDoesNotMutate() {
// 2. What's an Immutable Object?
final String name = "baeldung";
final String newName = name.replace("dung", "----");
assertEquals("baeldung", name);
assertEquals("bael----", newName);
}
public void whenReassignFinalValue_thenCompilerError() {
// 3. The final Keyword in Java (1)
final String name = "baeldung";
// name = "bael...";
}
@Test
public void whenAddingElementToList_thenSizeChange() {
// 3. The final Keyword in Java (2)
final List<String> strings = new ArrayList<>();
assertEquals(0, strings.size());
strings.add("baeldung");
assertEquals(1, strings.size());
}
}

46
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/inheritance/AppUnitTest.java Normal file
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package com.baeldung.inheritance;
import com.baeldung.inheritance.*;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
public class AppUnitTest extends TestCase {
public AppUnitTest(String testName) {
super( testName );
}
public static Test suite() {
return new TestSuite(AppUnitTest.class);
}
@SuppressWarnings("static-access")
public void testStaticMethodUsingBaseClassVariable() {
Car first = new ArmoredCar();
assertEquals("Car", first.msg());
}
@SuppressWarnings("static-access")
public void testStaticMethodUsingDerivedClassVariable() {
ArmoredCar second = new ArmoredCar();
assertEquals("ArmoredCar", second.msg());
}
public void testAssignArmoredCarToCar() {
Employee e1 = new Employee("Shreya", new ArmoredCar());
assertNotNull(e1.getCar());
}
public void testAssignSpaceCarToCar() {
Employee e2 = new Employee("Paul", new SpaceCar());
assertNotNull(e2.getCar());
}
public void testBMWToCar() {
Employee e3 = new Employee("Pavni", new BMW());
assertNotNull(e3.getCar());
}
}

41
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/inheritancecomposition/test/ActressUnitTest.java Normal file
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package com.baeldung.inheritancecomposition.test;
import com.baeldung.inheritancecomposition.model.Actress;
import org.junit.BeforeClass;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class ActressUnitTest {
private static Actress actress;
@BeforeClass
public static void setUpActressInstance() {
actress = new Actress("Susan", "susan@domain.com", 30);
}
@Test
public void givenActressInstance_whenCalledgetName_thenEqual() {
assertThat(actress.getName()).isEqualTo("Susan");
}
@Test
public void givenActressInstance_whenCalledgetEmail_thenEqual() {
assertThat(actress.getEmail()).isEqualTo("susan@domain.com");
}
@Test
public void givenActressInstance_whenCalledgetAge_thenEqual() {
assertThat(actress.getAge()).isEqualTo(30);
}
@Test
public void givenActressInstance_whenCalledreadScript_thenEqual() {
assertThat(actress.readScript("Psycho")).isEqualTo("Reading the script of Psycho");
}
@Test
public void givenActressInstance_whenCalledperfomRole_thenEqual() {
assertThat(actress.performRole()).isEqualTo("Performing a role");
}
}

24
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/inheritancecomposition/test/CompositionUnitTest.java Normal file
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package com.baeldung.inheritancecomposition.test;
import com.baeldung.inheritancecomposition.model.Computer;
import com.baeldung.inheritancecomposition.model.Memory;
import com.baeldung.inheritancecomposition.model.Processor;
import com.baeldung.inheritancecomposition.model.StandardMemory;
import com.baeldung.inheritancecomposition.model.StandardProcessor;
import com.baeldung.inheritancecomposition.model.StandardSoundCard;
import java.util.Optional;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class CompositionUnitTest {
@Test
public void givenComputerInstance_whenExtractedEachField_thenThreeAssertions() {
Computer computer = new Computer(new StandardProcessor("Intel I3"), new StandardMemory("Kingston", "1TB"));
computer.setSoundCard(new StandardSoundCard("Generic Sound Card"));
assertThat(computer.getProcessor()).isInstanceOf(Processor.class);
assertThat(computer.getMemory()).isInstanceOf(Memory.class);
assertThat(computer.getSoundCard()).isInstanceOf(Optional.class);
}
}

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