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Inheritance and Composition (Is-a vs Has-a relationship) in Java - BAEL-1598 (#3871) 

* Initial Commit

* Fix package names
This commit is contained in:
Alejandro Gervasio 2018-04-01 22:50:12 -03:00 committed by KevinGilmore
parent 5ce4bd458a
commit 2ed8ad2e00
16 changed files with 377 additions and 0 deletions
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27
core-java/src/main/java/com/baeldung/inheritancecomposition/application/Application.java Normal file
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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/src/main/java/com/baeldung/inheritancecomposition/model/Actress.java Normal file
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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/src/main/java/com/baeldung/inheritancecomposition/model/Computer.java Normal file
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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/src/main/java/com/baeldung/inheritancecomposition/model/Memory.java Normal file
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package com.baeldung.inheritancecomposition.model;
public interface Memory {
String getBrand();
String getSize();
}

31
core-java/src/main/java/com/baeldung/inheritancecomposition/model/Person.java Normal file
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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/src/main/java/com/baeldung/inheritancecomposition/model/Processor.java Normal file
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package com.baeldung.inheritancecomposition.model;
public interface Processor {
String getModel();
}

6
core-java/src/main/java/com/baeldung/inheritancecomposition/model/SoundCard.java Normal file
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package com.baeldung.inheritancecomposition.model;
public interface SoundCard {
String getBrand();
}

25
core-java/src/main/java/com/baeldung/inheritancecomposition/model/StandardMemory.java Normal file
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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/src/main/java/com/baeldung/inheritancecomposition/model/StandardProcessor.java Normal file
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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/src/main/java/com/baeldung/inheritancecomposition/model/StandardSoundCard.java Normal file
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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/src/main/java/com/baeldung/inheritancecomposition/model/Waitress.java Normal file
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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;
}
}

41
core-java/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/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);
}
}

20
core-java/src/test/java/com/baeldung/inheritancecomposition/test/InheritanceUnitTest.java Normal file
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package com.baeldung.inheritancecomposition.test;
import com.baeldung.inheritancecomposition.model.Actress;
import com.baeldung.inheritancecomposition.model.Person;
import com.baeldung.inheritancecomposition.model.Waitress;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class InheritanceUnitTest {
@Test
public void givenWaitressInstance_whenCheckedType_thenIsInstanceOfPerson() {
assertThat(new Waitress("Mary", "mary@domain.com", 22)).isInstanceOf(Person.class);
}
@Test
public void givenActressInstance_whenCheckedType_thenIsInstanceOfPerson() {
assertThat(new Actress("Susan", "susan@domain.com", 30)).isInstanceOf(Person.class);
}
}

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core-java/src/test/java/com/baeldung/inheritancecomposition/test/PersonUnitTest.java Normal file
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package com.baeldung.inheritancecomposition.test;
import com.baeldung.inheritancecomposition.model.Person;
import org.junit.BeforeClass;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class PersonUnitTest {
private static Person person;
@BeforeClass
public static void setPersonInstance() {
person = new Person("John", "john@domain.com", 35);
}
@Test
public void givenPersonInstance_whenCalledgetName_thenEqual() {
assertThat(person.getName()).isEqualTo("John");
}
@Test
public void givenPersonInstance_whenCalledgetEmail_thenEqual() {
assertThat(person.getEmail()).isEqualTo("john@domain.com");
}
@Test
public void givenPersonInstance_whenCalledgetAge_thenEqual() {
assertThat(person.getAge()).isEqualTo(35);
}
}

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core-java/src/test/java/com/baeldung/inheritancecomposition/test/WaitressUnitTest.java Normal file
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package com.baeldung.inheritancecomposition.test;
import com.baeldung.inheritancecomposition.model.Waitress;
import org.junit.BeforeClass;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class WaitressUnitTest {
private static Waitress waitress;
@BeforeClass
public static void setUpWaitressInstance() {
waitress = new Waitress("Mary", "mary@domain.com", 22);
}
@Test
public void givenWaitressInstance_whenCalledgetName_thenOneAssertion() {
assertThat(waitress.getName()).isEqualTo("Mary");
}
@Test
public void givenWaitressInstance_whenCalledgetEmail_thenOneAssertion() {
assertThat(waitress.getEmail()).isEqualTo("mary@domain.com");
}
@Test
public void givenWaitressInstance_whenCalledgetAge_thenOneAssertion() {
assertThat(waitress.getAge()).isEqualTo(22);
}
@Test
public void givenWaitressInstance_whenCalledserveStarter_thenOneAssertion() {
assertThat(waitress.serveStarter("mixed salad")).isEqualTo("Serving a mixed salad");
}
@Test
public void givenWaitressInstance_whenCalledserveMainCourse_thenOneAssertion() {
assertThat(waitress.serveMainCourse("steak")).isEqualTo("Serving a steak");
}
@Test
public void givenWaitressInstance_whenCalledserveDessert_thenOneAssertion() {
assertThat(waitress.serveDessert("cup of coffee")).isEqualTo("Serving a cup of coffee");
}
}