JAVA的接口

用法：

interface A {
    public static final int i = 10;

    public void runLoad();
}

public class Demo implements A {
    // 实现接口中的方法
    @Override
    public void runLoad() {
        System.out.println("这是调用的接口中的方法");
    }

    public static void main(String[] args) {
        Demo d = new Demo();
        d.runLoad();
    }
}

示例：

//铅笔
class Pencil {
    String name;

    public Pencil(String name) {
        this.name = name;
    }

    public void writer() {
        System.out.println(name + "写字");
    }
}

//橡皮檫接口
interface Eraser {
    public void remove();
}

//带橡皮檫的铅笔
class PencilEraser extends Pencil implements Eraser {
    public PencilEraser(String name) {
        super(name);
    }

    @Override
    public void remove() {
        System.out.println(name + "涂改");
    }
}

public class DemoPencil {
    public static void main(String[] args) {
        PencilEraser p = new PencilEraser("2B铅笔");
        p.writer();
        p.remove();
    }
}