JAVA进阶23

 1 package cn.intcast.demo17;
 2 
 3 public interface MyInterfaceDefault {
 4     //抽象方法
 5     public abstract void methodAbs();
 6 //    void AAA();
 7     public default void methodA(){
 8         System.out.println("this is a default method!");
 9     }
10 }

1 package cn.intcast.demo17;
2 
3 public class MyInterfaceDefaultA implements MyInterfaceDefault {
4     @Override
5     public void methodAbs() {
6         System.out.println("实现了抽象 方法，AAA；");
7     }
8 }

 1 package cn.intcast.demo17;
 2 
 3 public class Code01Interface {
 4     public static void main(String[] args) {
 5         //创建实现类对象
 6         MyInterfaceDefaultA s = new MyInterfaceDefaultA();
 7         //调用抽象方法，如果实现类当中没有，会向上找接口
 8         s.methodA();
 9         s.methodAbs();
10     }
11 }

1 package cn.intcast.demo17;
2 
3 public interface StaticInterface {
4     public static void staticmethod(){
5         System.out.println("this is a static method!");
6     }
7 }

1 package cn.intcast.demo17;
2 
3 public class CodeStatic {
4     public static void main(String[] args) {
5         StaticInterface.staticmethod();
6     }
7 }