JAVA的接口

用法：

1 1 interface A {
2 2     public static final int i = 10;
3 3 
4 4     public void runLoad();
5 5 }
6 6 
7 7 public class Demo implements A {
8 8     // 实现接口中的方法
9 9     @Override
1010     public void runLoad() {
1111         System.out.println("这是调用的接口中的方法");
1212     }
1313 
1414     public static void main(String[] args) {
1515         Demo d = new Demo();
1616         d.runLoad();
1717     }
1818 }

示例：

1 1 //铅笔
2 2 class Pencil {
3 3     String name;
4 4 
5 5     public Pencil(String name) {
6 6         this.name = name;
7 7     }
8 8 
9 9     public void writer() {
1010         System.out.println(name + "写字");
1111     }
1212 }
1313 
1414 //橡皮檫接口
1515 interface Eraser {
1616     public void remove();
1717 }
1818 
1919 //带橡皮檫的铅笔
2020 class PencilEraser extends Pencil implements Eraser {
2121     public PencilEraser(String name) {
2222         super(name);
2323     }
2424 
2525     @Override
2626     public void remove() {
2727         System.out.println(name + "涂改");
2828     }
2929 }
3030 
3131 public class DemoPencil {
3232     public static void main(String[] args) {
3333         PencilEraser p = new PencilEraser("2B铅笔");
3434         p.writer();
3535         p.remove();
3636     }
3737 }