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ch1.java
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34 lines (29 loc) · 880 Bytes
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public abstract class Animal {
abstract void makeSound(); // 抽象方法
}
public class Chicken extends Animal {
public void makeSound() {
System.out.println("咯咯咯");
}
}
public class Duck extends Animal {
public void makeSound() {
System.out.println("嘎嘎嘎");
}
}
Animal duck = new Duck(); // (1)
Animal chicken = new Chicken(); // (2)
public class AnimalSound {
public void makeSound(Animal animal) { // 接受Animal 类型的参数
animal.makeSound();
}
}
public class Test {
public static void main( String args[] ){
AnimalSound animalSound= new AnimalSound ();
Animal duck = new Duck();
Animal chicken = new Chicken();
animalSound.makeSound( duck ); // 输出嘎嘎嘎
animalSound.makeSound( chicken ); // 输出咯咯咯
}
}