JavaSE-12.2.4【匿名内部类在开发中的使用】

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

package day3.yub4by02.p4;   /* 2.5 匿名内部类在开发中的使用     当发现某个方法需要，接口或抽象类的子类对象，     就可以传递一个匿名内部类过去，来简化传统代码  */   public class JumppingDemo {       public static void main(String[] args) {         JumppingOperator jo = new JumppingOperator();   //        Jumpping j = new Cat(); //        jo.method(j); // //        Jumpping j2 = new Dog(); //        jo.method(j2);           //省去单独编写Cat Dog类         jo.method(                 new Jumpping() {                     @Override                     public void jump() {                         System.out.println("兔子跳多高");                     }                 }         );           jo.method(                 new Jumpping() {                     @Override                     public void jump() {                         System.out.println("猪猪跳多高");                     }                 }         );     }   }

　　

?

1 2 3 4 5 6 7

package day3.yub4by02.p4;   public class JumppingOperator {     public void method(Jumpping j){ //new Cat();new Dog();new xxx(); .....         j.jump();     } }

　　

?

1 2 3 4 5

package day3.yub4by02.p4;   public interface Jumpping {     void jump(); }

　　

?

1 2 3 4 5 6 7 8

package day3.yub4by02.p4;   public class Cat implements Jumpping{     @Override     public void jump() {         System.out.println("猫猫跳多高");     } }

　　

?

1 2 3 4 5 6 7 8

package day3.yub4by02.p4;   public class Dog implements Jumpping{     @Override     public void jump() {         System.out.println("狗狗跳多高");     } }