[Ch10b] Examples for generic weirdness (72d81264) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch10b/TestGenerics1.java

0 → 100644

+38 −0

Changes for src/main/java/ch10b/TestGenerics1.java: 38 added lines, 0 removed lines.
Original line number	Diff line number	Diff line
		package ch10b;

		public class TestGenerics1 {
		public static void main(String[] args) {
		new TestGenerics1().go();
		}

		public void go() {
		Animal[] animals = {new Dog(), new Cat(), new Dog()};
		Dog[] dogs = {new Dog(), new Dog(), new Dog()};
		takeAnimals(animals);
		takeAnimals(dogs);
		}

		public void takeAnimals(Animal[] animals) {
		for (Animal a : animals) {
		a.eat();
		}
		}
		}

		abstract class Animal {
		void eat() {
		System.out.println("animal eating");
		}
		}

		class Dog extends Animal {
		void bark() {
		}
		}

		class Cat extends Animal {
		void meow() {
		}
		}


		No newline at end of file

0 → 100644

+26 −0

Changes for src/main/java/ch10b/TestGenerics2.java: 26 added lines, 0 removed lines.
Original line number	Diff line number	Diff line
		package ch10b;

		import java.util.*;

		public class TestGenerics2 {
		public static void main(String[] args) {
		new TestGenerics1().go();
		}

		public void go() {
		List<Animal> animals = new ArrayList<>();
		animals.add(new Dog());
		animals.add(new Cat());
		animals.add(new Dog());

		takeAnimals(animals);
		}

		public void takeAnimals(List<Animal> animals) {
		for (Animal a : animals) {
		a.eat();
		}
		}
		}


		No newline at end of file