[Ch10b] Removing the generics example with arrays, cos it's a bit confusing (e15012a6) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch10b/TestGenerics1.java

+4 −8

Changes for src/main/java/ch10b/TestGenerics1.java: 4 added lines, 8 removed lines.
Original line number	Diff line number	Diff line
		package ch10b;

		import java.util.List;

		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()};
		List<Animal> animals = List.of(new Dog(), new Cat(), new Dog());
		takeAnimals(animals);
		takeAnimals(dogs);
		}

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

+3 −0

Changes for src/main/java/ch10b/TestGenerics2.java: 3 added lines, 0 removed lines.
Original line number	Diff line number	Diff line
		@@ -10,6 +10,9 @@ public class TestGenerics2 {
		public void go() {
		List<Animal> animals = List.of(new Dog(), new Cat(), new Dog());
		takeAnimals(animals);

		List<Dog> dogs = List.of(new Dog(), new Dog());
		// takeAnimals(dogs);
		}

		public void takeAnimals(List<Animal> animals) {

+8 −2

Changes for src/main/java/ch10b/TestGenerics3.java: 8 added lines, 2 removed lines.
Original line number	Diff line number	Diff line
		@@ -12,10 +12,16 @@ public class TestGenerics3 {
		takeAnimals(animals);

		List<Dog> dogs = List.of(new Dog(), new Dog());
		// takeAnimals(dogs);
		takeAnimals(dogs);
		}

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

		public <T extends Animal> void takeAnimals2(List<T> animals) {
		for (Animal a : animals) {
		a.eat();
		}

deleted100644 → 0

+0 −32

Changes for src/main/java/ch10b/TestGenerics4.java: 0 added lines, 32 removed lines.
Original line number	Diff line number	Diff line
		package ch10b;

		import java.util.*;

		public class TestGenerics4 {
		public static void main(String[] args) {
		new TestGenerics4().go();
		}

		public void go() {
		List<Animal> animals = List.of(new Dog(), new Cat(), new Dog());
		takeAnimals(animals);

		List<Dog> dogs = List.of(new Dog(), new Dog());
		takeAnimals(dogs);
		}

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

		public <T extends Animal> void takeAnimals2(List<T> animals) {
		for (Animal a : animals) {
		a.eat();
		}
		}
		}