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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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9
core-java-modules/core-java-lang-oop-modifiers/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-modifiers/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-modifiers/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-modifiers/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-modifiers/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-modifiers/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.
}
}

31
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/accessmodifiers/publicmodifier/ListOfThree.java Normal file
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package com.baeldung.accessmodifiers.publicmodifier;
import java.util.AbstractList;
import java.util.Arrays;
public class ListOfThree<E> extends AbstractList<E> {
private static final int LENGTH = 3;
private Object[] elements;
public ListOfThree(E[] data) {
if(data == null
|| data.length != LENGTH)
throw new IllegalArgumentException();
this.elements = Arrays.copyOf(data, data.length); //shallow copy
}
@Override
@SuppressWarnings("unchecked")
public E get(int index) {
return (E)elements[index];
}
@Override
public int size() {
return LENGTH;
}
}

7
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/accessmodifiers/publicmodifier/SpecialCharacters.java Normal file
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package com.baeldung.accessmodifiers.publicmodifier;
public class SpecialCharacters {
public static final String SLASH = "/";
}

67
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/accessmodifiers/publicmodifier/Student.java Normal file
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package com.baeldung.accessmodifiers.publicmodifier;
import java.math.BigDecimal;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Date;
public class Student {
private StudentGrade grade; //new data representation
// private int grade; //old data representation
private String name;
private int age;
public void setGrade(int grade) {
this.grade = new StudentGrade(grade);
}
public int getGrade() {
return this.grade.getGrade().intValue(); //int is returned for backward compatibility
}
public Connection getConnection() throws SQLException {
final String URL = "jdbc:h2:~/test";
return DriverManager.getConnection(URL, "sa", "");
}
public void setAge(int age) {
if (age < 0 || age > 150) {
throw new IllegalArgumentException();
}
this.age = age;
}
public int getAge() {
return age;
}
@Override
public String toString() {
return this.name;
}
private class StudentGrade {
private BigDecimal grade = BigDecimal.ZERO;
private Date updatedAt;
public StudentGrade(int grade) {
this.grade = new BigDecimal(grade);
this.updatedAt = new Date();
}
public BigDecimal getGrade() {
return grade;
}
public Date getDate() {
return updatedAt;
}
}
}

59
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/core/privatemodifier/Employee.java Normal file
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package com.baeldung.core.privatemodifier;
public class Employee {
private String privateId;
private String name;
private boolean manager;
public Employee(String id, String name) {
setPrivateId(id);
setName(name);
}
private Employee(String id, String name, boolean managerAttribute) {
this.privateId = id;
this.name = name;
this.privateId = id + "_ID-MANAGER";
}
public void setPrivateId(String customId) {
if (customId.endsWith("_ID")) {
this.privateId = customId;
} else {
this.privateId = customId + "_ID";
}
}
public String getPrivateId() {
return privateId;
}
public boolean isManager() {
return manager;
}
public void elevateToManager() {
if ("Carl".equals(this.name)) {
setManager(true);
}
}
private void setManager(boolean manager) {
this.manager = manager;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public static Employee buildManager(String id, String name) {
return new Employee(id, name, true);
}
}

10
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/core/privatemodifier/ExampleClass.java Normal file
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package com.baeldung.core.privatemodifier;
public class ExampleClass {
public static void main(String[] args) {
Employee employee = new Employee("Bob","ABC123");
employee.setPrivateId("BCD234");
System.out.println(employee.getPrivateId());
}
}

16
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/core/privatemodifier/PublicOuterClass.java Normal file
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package com.baeldung.core.privatemodifier;
public class PublicOuterClass {
public PrivateInnerClass getInnerClassInstance() {
PrivateInnerClass myPrivateClassInstance = this.new PrivateInnerClass();
myPrivateClassInstance.id = "ID1";
myPrivateClassInstance.name = "Bob";
return myPrivateClassInstance;
}
private class PrivateInnerClass {
public String name;
public String id;
}
}

18
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/defaultstaticinterfacemethods/application/Application.java Normal file
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package com.baeldung.defaultstaticinterfacemethods.application;
import com.baeldung.defaultstaticinterfacemethods.model.Car;
import com.baeldung.defaultstaticinterfacemethods.model.Vehicle;
public class Application {
public static void main(String[] args) {
Vehicle car = new Car("BMW");
System.out.println(car.getBrand());
System.out.println(car.speedUp());
System.out.println(car.slowDown());
System.out.println(car.turnAlarmOn());
System.out.println(car.turnAlarmOff());
System.out.println(Vehicle.getHorsePower(2500, 480));
}
}

12
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/defaultstaticinterfacemethods/model/Alarm.java Normal file
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package com.baeldung.defaultstaticinterfacemethods.model;
public interface Alarm {
default String turnAlarmOn() {
return "Turning the alarm on.";
}
default String turnAlarmOff() {
return "Turning the alarm off.";
}
}

25
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/defaultstaticinterfacemethods/model/Car.java Normal file
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package com.baeldung.defaultstaticinterfacemethods.model;
public class Car implements Vehicle {
private final String brand;
public Car(String brand) {
this.brand = brand;
}
@Override
public String getBrand() {
return brand;
}
@Override
public String speedUp() {
return "The car is speeding up.";
}
@Override
public String slowDown() {
return "The car is slowing down.";
}
}

25
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/defaultstaticinterfacemethods/model/Motorbike.java Normal file
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package com.baeldung.defaultstaticinterfacemethods.model;
public class Motorbike implements Vehicle {
private final String brand;
public Motorbike(String brand) {
this.brand = brand;
}
@Override
public String getBrand() {
return brand;
}
@Override
public String speedUp() {
return "The motorbike is speeding up.";
}
@Override
public String slowDown() {
return "The motorbike is slowing down.";
}
}

35
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/defaultstaticinterfacemethods/model/MultiAlarmCar.java Normal file
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package com.baeldung.defaultstaticinterfacemethods.model;
public class MultiAlarmCar implements Vehicle, Alarm {
private final String brand;
public MultiAlarmCar(String brand) {
this.brand = brand;
}
@Override
public String getBrand() {
return brand;
}
@Override
public String speedUp() {
return "The motorbike is speeding up.";
}
@Override
public String slowDown() {
return "The mootorbike is slowing down.";
}
@Override
public String turnAlarmOn() {
return Vehicle.super.turnAlarmOn() + " " + Alarm.super.turnAlarmOn();
}
@Override
public String turnAlarmOff() {
return Vehicle.super.turnAlarmOff() + " " + Alarm.super.turnAlarmOff();
}
}

22
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/defaultstaticinterfacemethods/model/Vehicle.java Normal file
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package com.baeldung.defaultstaticinterfacemethods.model;
public interface Vehicle {
String getBrand();
String speedUp();
String slowDown();
default String turnAlarmOn() {
return "Turning the vehice alarm on.";
}
default String turnAlarmOff() {
return "Turning the vehicle alarm off.";
}
static int getHorsePower(int rpm, int torque) {
return (rpm * torque) / 5252;
}
}

5
core-java-modules/core-java-lang-oop-modifiers/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-modifiers/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-modifiers/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-modifiers/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() {
}
}

48
core-java-modules/core-java-lang-oop-modifiers/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-modifiers/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-modifiers/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;
}
}

5
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/strictfpUsage/Circle.java Normal file
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package com.baeldung.strictfpUsage;
public strictfp interface Circle {
double computeArea(double radius);
}

12
core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/strictfpUsage/ScientificCalculator.java Normal file
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package com.baeldung.strictfpUsage;
public strictfp class ScientificCalculator {
public double sum(double value1, double value2) {
return value1 + value2;
}
public double diff(double value1, double value2) {
return value1 - value2;
}
}

94
core-java-modules/core-java-lang-oop-modifiers/src/test/java/com/baeldung/accessmodifiers/publicmodifier/PublicAccessModifierUnitTest.java Normal file
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package com.baeldung.accessmodifiers.publicmodifier;
import com.baeldung.accessmodifiers.publicmodifier.ListOfThree;
import com.baeldung.accessmodifiers.publicmodifier.Student;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestInstance;
import org.junit.jupiter.api.TestInstance.Lifecycle;
import java.math.BigDecimal;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.jupiter.api.Assertions.assertEquals;
@TestInstance(Lifecycle.PER_CLASS)
public class PublicAccessModifierUnitTest {
@Test
public void whenUsingBigDecimalIntValueMethod_correspondingIntIsReturned() {
assertEquals(0, new BigDecimal(0).intValue()); //instance member
}
@Test
public void whenUsingIntegerMaxValueField_maxPossibleIntValueIsReturned() {
assertEquals(2147483647, Integer.MAX_VALUE); //static field
}
@Test
public void whenChangingStudentInternalRepresentation_clientCodeWillNotBreak() {
Student student = new Student();
student.setGrade(100);
assertEquals(100, student.getGrade());
}
@Test
public void whenUsingEntrySet_keyValuePairsAreReturned() {
Map<String, String> mapObject = new HashMap<String, String>();
mapObject.put("name", "Alex");
for(Map.Entry<String, String> entry : mapObject.entrySet()) {
assertEquals("name", entry.getKey());
assertEquals("Alex", entry.getValue());
}
}
@Test
public void whenUsingStringToLowerCase_stringTurnsToLowerCase() {
assertEquals("alex", "ALEX".toLowerCase());
}
@Test
public void whenParsingStringOne_parseIntReturns1() {
assertEquals(1, Integer.parseInt("1"));
}
@Test
public void whenConnectingToH2_connectionInstanceIsReturned() throws SQLException {
final String url = "jdbc:h2:~/test";
Connection conn = DriverManager.getConnection(url, "sa", "");
assertNotNull(conn);
}
@Test
public void whenCreatingCustomList_concreteAndInheritedMethodsWork() {
String[] dataSet1 = new String[] {"zero", "one", "two"};
List<String> list1 = new ListOfThree<String>(dataSet1);
//our implemented methods
assertEquals("one", list1.get(1));
assertEquals(3, list1.size());
//inherited implementations
assertEquals(1, list1.indexOf("one"));
String[] dataSet2 = new String[] {"two", "zero", "one"};
List<String> list2 = new ListOfThree<String>(dataSet2);
assertTrue(list1.containsAll(list2));
}
}

79
core-java-modules/core-java-lang-oop-modifiers/src/test/java/com/baeldung/defaultstaticinterfacemethods/test/StaticDefaulInterfaceMethodUnitTest.java Normal file
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package com.baeldung.defaultstaticinterfacemethods.test;
import com.baeldung.defaultstaticinterfacemethods.model.Car;
import com.baeldung.defaultstaticinterfacemethods.model.Motorbike;
import com.baeldung.defaultstaticinterfacemethods.model.Vehicle;
import org.junit.BeforeClass;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class StaticDefaulInterfaceMethodUnitTest {
private static Car car;
private static Motorbike motorbike;
@BeforeClass
public static void setUpCarInstance() {
car = new Car("BMW");
}
@BeforeClass
public static void setUpMotorbikeInstance() {
motorbike = new Motorbike("Yamaha");
}
@Test
public void givenCarInstace_whenBrandisBMW_thenOneAssertion() {
assertThat(car.getBrand()).isEqualTo("BMW");
}
@Test
public void givenCarInstance_whenCallingSpeedUp_thenOneAssertion() {
assertThat(car.speedUp()).isEqualTo("The car is speeding up.");
}
@Test
public void givenCarInstance_whenCallingSlowDown_thenOneAssertion() {
assertThat(car.slowDown()).isEqualTo("The car is slowing down.");
}
@Test
public void givenCarInstance_whenCallingTurnAlarmOn_thenOneAssertion() {
assertThat(car.turnAlarmOn()).isEqualTo("Turning the vehice alarm on.");
}
@Test
public void givenCarInstance_whenCallingTurnAlarmOff_thenOneAssertion() {
assertThat(car.turnAlarmOff()).isEqualTo("Turning the vehicle alarm off.");
}
@Test
public void givenVehicleInterface_whenCallinggetHorsePower_thenOneAssertion() {
assertThat(Vehicle.getHorsePower(2500, 480)).isEqualTo(228);
}
@Test
public void givenMooorbikeInstace_whenBrandisYamaha_thenOneAssertion() {
assertThat(motorbike.getBrand()).isEqualTo("Yamaha");
}
@Test
public void givenMotorbikeInstance_whenCallingSpeedUp_thenOneAssertion() {
assertThat(motorbike.speedUp()).isEqualTo("The motorbike is speeding up.");
}
@Test
public void givenMotorbikeInstance_whenCallingSlowDown_thenOneAssertion() {
assertThat(motorbike.slowDown()).isEqualTo("The motorbike is slowing down.");
}
@Test
public void givenMotorbikeInstance_whenCallingTurnAlarmOn_thenOneAssertion() {
assertThat(motorbike.turnAlarmOn()).isEqualTo("Turning the vehice alarm on.");
}
@Test
public void givenMotorbikeInstance_whenCallingTurnAlarmOff_thenOneAssertion() {
assertThat(motorbike.turnAlarmOff()).isEqualTo("Turning the vehicle alarm off.");
}
}

33
core-java-modules/core-java-lang-oop-modifiers/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());
}
}

14
core-java-modules/core-java-lang-oop-modifiers/src/test/java/com/baeldung/staticdemo/CarUnitTest.java Normal file
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package com.baeldung.staticdemo;
import static org.junit.Assert.*;
import org.junit.Test;
public class CarUnitTest {
@Test
public void whenNumberOfCarObjectsInitialized_thenStaticCounterIncreases() {
new Car("Jaguar", "V8");
new Car("Bugatti", "W16");
assertEquals(2, Car.numberOfCars);
}
}

15
core-java-modules/core-java-lang-oop-modifiers/src/test/java/com/baeldung/staticdemo/SingletonUnitTest.java Normal file
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package com.baeldung.staticdemo;
import org.junit.Assert;
import org.junit.Test;
public class SingletonUnitTest {
@Test
public void givenStaticInnerClass_whenMultipleTimesInstanceCalled_thenOnlyOneTimeInitialized() {
Singleton object1 = Singleton.getInstance();
Singleton object2 = Singleton.getInstance();
Assert.assertSame(object1, object2);
}
}

17
core-java-modules/core-java-lang-oop-modifiers/src/test/java/com/baeldung/staticdemo/StaticBlockUnitTest.java Normal file
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package com.baeldung.staticdemo;
import static org.hamcrest.collection.IsIterableContainingInOrder.contains;
import static org.junit.Assert.assertThat;
import java.util.List;
import org.junit.Test;
public class StaticBlockUnitTest {
@Test
public void whenAddedListElementsThroughStaticBlock_thenEnsureCorrectOrder() {
List<String> actualList = StaticBlock.getRanks();
assertThat(actualList, contains("Lieutenant", "Captain", "Major", "Colonel", "General"));
}
}

18
core-java-modules/core-java-lang-oop-modifiers/src/test/java/com/baeldung/strictfpUsage/ScientificCalculatorUnitTest.java Normal file
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package com.baeldung.strictfpUsage;
import org.junit.Test;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
public class ScientificCalculatorUnitTest {
@Test
public void whenMethodOfstrictfpClassInvoked_thenIdenticalResultOnAllPlatforms() {
ScientificCalculator calculator = new ScientificCalculator();
double result = calculator.sum(23e10, 98e17);
assertThat(result, is(9.800000230000001E18));
result = calculator.diff(Double.MAX_VALUE, 1.56);
assertThat(result, is(1.7976931348623157E308));
}
}