接口（适配器）

　　

package workhome;

public class WindowDemo {
    public static void main(String[] args) {
        //匿名内部类对象，方法链编程
        new Window().addListener(new WindowAdapter() {
            public void max() {
                System.out.println("窗口最大化");
            }
            public void min() {
                System.out.println("窗口最小化");
            }
        }).winMax()
          .winMin();
    }
}

interface WindowListener{
    public void max();
    public void min();
    public void resize();
    public void restore();
    public void move();
    public void close();
}

//适配器
abstract class WindowAdapter implements WindowListener{
    public void max(){}
    public void min(){}
    public void resize(){}
    public void restore(){}
    public void move(){}
    public void close(){}
}

class Window{
    private WindowListener l;
    public Window addListener(WindowListener l) {
        this.l=l;
        return this;
    }
    
    public Window winMax() {
        l.max();
        return this;
    }
    
    public void winMin() {
        l.min();
    }
}