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Add java interface single implementation examples (#13972)

This commit is contained in:
Dileesha Rajapakse 2023-05-14 22:45:57 +05:30 committed by GitHub
parent 4fb65f5c6e
commit 65f6f416c5
6 changed files with 120 additions and 0 deletions
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5
core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/interfacesingleimpl/Animal.java Normal file
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package com.baeldung.interfacesingleimpl;
public interface Animal {
String makeSound();
}

13
core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/interfacesingleimpl/AnimalCare.java Normal file
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package com.baeldung.interfacesingleimpl;
public class AnimalCare {
private Animal animal;
public AnimalCare(Animal animal) {
this.animal = animal;
}
public String animalSound() {
return animal.makeSound();
}
}

21
core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/interfacesingleimpl/Cat.java Normal file
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package com.baeldung.interfacesingleimpl;
public class Cat {
private String name;
public Cat(String name) {
this.name = name;
}
public String makeSound() {
return "Meow! My name is " + name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

22
core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/interfacesingleimpl/Dog.java Normal file
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package com.baeldung.interfacesingleimpl;
public class Dog implements Animal {
private String name;
public Dog(String name) {
this.name = name;
}
@Override
public String makeSound() {
return "Woof! My name is " + name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

51
core-java-modules/core-java-lang-oop-patterns/src/test/java/com/baeldung/interfacesingleimpl/InterfaceSingleImplUnitTest.java Normal file
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package com.baeldung.interfacesingleimpl;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class InterfaceSingleImplUnitTest {
@Test
public void whenUsingMockAnimal_thenAnimalSoundIsCorrect() {
MockAnimal mockAnimal = new MockAnimal();
String expected = "Mock animal sound!";
AnimalCare animalCare = new AnimalCare(mockAnimal);
assertThat(animalCare.animalSound()).isEqualTo(expected);
}
@Test
public void whenCreatingDog_thenDogMakesWoofSound() {
Dog dog = new Dog("Buddy");
String expected = "Woof! My name is Buddy";
assertThat(dog.makeSound()).isEqualTo(expected);
}
@Test
public void whenCreatingCat_thenCatMakesMeowSound() {
Cat cat = new Cat("FuzzBall");
String expected = "Meow! My name is FuzzBall";
assertThat(cat.makeSound()).isEqualTo(expected);
}
@Test
public void whenCreatingAnimalCareWithDog_thenDogMakesWoofSound() {
Animal dog = new Dog("Ham");
AnimalCare animalCare = new AnimalCare(dog);
String expected = "Woof! My name is Ham";
assertThat(animalCare.animalSound()).isEqualTo(expected);
}
@Test
public void whenCreatingCatCareWithCat_thenCatMakesMeowSound() {
Cat cat = new Cat("Grumpy");
String expected = "Meow! My name is Grumpy";
assertThat(cat.makeSound()).isEqualTo(expected);
}
@Test
public void whenCreatingMockAnimal_thenMockAnimalMakesMockAnimalSound() {
MockAnimal mockAnimal = new MockAnimal();
String expected = "Mock animal sound!";
assertThat(mockAnimal.makeSound()).isEqualTo(expected);
}
}

8
core-java-modules/core-java-lang-oop-patterns/src/test/java/com/baeldung/interfacesingleimpl/MockAnimal.java Normal file
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package com.baeldung.interfacesingleimpl;
public class MockAnimal implements Animal {
@Override
public String makeSound() {
return "Mock animal sound!";
}
}