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[JAVA-621] Flattened modules hierarchy

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This commit is contained in:
dupirefr
2020-04-07 21:28:45 +02:00
parent 635ecae691
commit 42b0086080
210 changed files with 24 additions and 44 deletions
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37
core-java-modules/core-java-lang-oop-methods/src/main/java/com/baeldung/basicmethods/PersonName.java Normal file
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package com.baeldung.basicmethods;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
public class PersonName {
public String getName(String firstName, String lastName) throws RuntimeException {
return firstName + " " + lastName;
}
public String getName(String firstName, String middleName, String lastName) {
if (!middleName.equals("")) {
return firstName + " " + lastName;
}
return firstName + " " + middleName + " " + lastName;
}
public void printFullName(String firstName, String lastName) {
System.out.println(firstName + " " + lastName);
}
public void writeName(String name) throws IOException {
PrintWriter out = new PrintWriter(new FileWriter("OutFile.txt"));
out.println("Name: " + name);
out.close();
}
public static String getNameStatic(String firstName, String lastName) {
return firstName + " " + lastName;
}
public static void callToStaticMethod() {
System.out.println("Name is: " + PersonName.getNameStatic("Alan", "Turing"));
}
}

36
core-java-modules/core-java-lang-oop-methods/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-methods/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-methods/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-methods/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-methods/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;
}
}

42
core-java-modules/core-java-lang-oop-methods/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
}

26
core-java-modules/core-java-lang-oop-methods/src/main/java/com/baeldung/methodoverloadingoverriding/application/Application.java Normal file
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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-methods/src/main/java/com/baeldung/methodoverloadingoverriding/model/Car.java Normal file
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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-methods/src/main/java/com/baeldung/methodoverloadingoverriding/model/Vehicle.java Normal file
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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-methods/src/main/java/com/baeldung/methodoverloadingoverriding/util/Multiplier.java Normal file
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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;
}
}

27
core-java-modules/core-java-lang-oop-methods/src/test/java/com/baeldung/equalshashcode/MoneyUnitTest.java Normal file
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package com.baeldung.equalshashcode;
import org.junit.Test;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
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));
}
}

45
core-java-modules/core-java-lang-oop-methods/src/test/java/com/baeldung/equalshashcode/TeamUnitTest.java Normal file
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package com.baeldung.equalshashcode;
import nl.jqno.equalsverifier.EqualsVerifier;
import org.junit.Test;
import java.util.HashMap;
import java.util.Map;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
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();
}
}

26
core-java-modules/core-java-lang-oop-methods/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-methods/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());
}
}

41
core-java-modules/core-java-lang-oop-methods/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverloadingUnitTest.java Normal file
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package com.baeldung.methodoverloadingoverriding.test;
import com.baeldung.methodoverloadingoverriding.util.Multiplier;
import org.junit.BeforeClass;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class MethodOverloadingUnitTest {
private static Multiplier multiplier;
@BeforeClass
public static void setUpMultiplierInstance() {
multiplier = new Multiplier();
}
@Test
public void givenMultiplierInstance_whenCalledMultiplyWithTwoIntegers_thenOneAssertion() {
assertThat(multiplier.multiply(10, 10)).isEqualTo(100);
}
@Test
public void givenMultiplierInstance_whenCalledMultiplyWithTreeIntegers_thenOneAssertion() {
assertThat(multiplier.multiply(10, 10, 10)).isEqualTo(1000);
}
@Test
public void givenMultiplierInstance_whenCalledMultiplyWithIntDouble_thenOneAssertion() {
assertThat(multiplier.multiply(10, 10.5)).isEqualTo(105.0);
}
@Test
public void givenMultiplierInstance_whenCalledMultiplyWithDoubleDouble_thenOneAssertion() {
assertThat(multiplier.multiply(10.5, 10.5)).isEqualTo(110.25);
}
@Test
public void givenMultiplierInstance_whenCalledMultiplyWithIntIntAndMatching_thenNoTypePromotion() {
assertThat(multiplier.multiply(10, 10)).isEqualTo(100);
}
}

68
core-java-modules/core-java-lang-oop-methods/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverridingUnitTest.java Normal file
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package com.baeldung.methodoverloadingoverriding.test;
import com.baeldung.methodoverloadingoverriding.model.Car;
import com.baeldung.methodoverloadingoverriding.model.Vehicle;
import org.junit.BeforeClass;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class MethodOverridingUnitTest {
private static Vehicle vehicle;
private static Car car;
@BeforeClass
public static void setUpVehicleInstance() {
vehicle = new Vehicle();
}
@BeforeClass
public static void setUpCarInstance() {
car = new Car();
}
@Test
public void givenVehicleInstance_whenCalledAccelerate_thenOneAssertion() {
assertThat(vehicle.accelerate(100)).isEqualTo("The vehicle accelerates at : 100 MPH.");
}
@Test
public void givenVehicleInstance_whenCalledRun_thenOneAssertion() {
assertThat(vehicle.run()).isEqualTo("The vehicle is running.");
}
@Test
public void givenVehicleInstance_whenCalledStop_thenOneAssertion() {
assertThat(vehicle.stop()).isEqualTo("The vehicle has stopped.");
}
@Test
public void givenCarInstance_whenCalledAccelerate_thenOneAssertion() {
assertThat(car.accelerate(80)).isEqualTo("The car accelerates at : 80 MPH.");
}
@Test
public void givenCarInstance_whenCalledRun_thenOneAssertion() {
assertThat(car.run()).isEqualTo("The vehicle is running.");
}
@Test
public void givenCarInstance_whenCalledStop_thenOneAssertion() {
assertThat(car.stop()).isEqualTo("The vehicle has stopped.");
}
@Test
public void givenVehicleCarInstances_whenCalledAccelerateWithSameArgument_thenNotEqual() {
assertThat(vehicle.accelerate(100)).isNotEqualTo(car.accelerate(100));
}
@Test
public void givenVehicleCarInstances_whenCalledRun_thenEqual() {
assertThat(vehicle.run()).isEqualTo(car.run());
}
@Test
public void givenVehicleCarInstances_whenCalledStop_thenEqual() {
assertThat(vehicle.stop()).isEqualTo(car.stop());
}
}