Java中adapter适配器

1. Java中adapter适配器

适配器adapter实现了全部接口的方法，并且是空实现。

import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.Label;
import java.awt.TextField;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class TwoListenAdapter {
    private Frame frame;
    private TextField textField;
    public void go(){
        frame = new Frame("Two Listeners Example");
        frame.add(new Label("click"), BorderLayout.NORTH);
        textField = new TextField(30);
        frame.add(textField, BorderLayout.SOUTH);
        frame.addMouseListener(new MyAdapter());
        frame.setSize(300, 200);
        frame.setVisible(true);
    }
    public static void main(String[] args) {
        TwoListen two = new TwoListen();
        two.go();
    }
}
class MyAdapter extends MouseAdapter{
    @Override
    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub
        String str = "The mouse has entered the Frame";
        System.out.println(str);
    }
    @Override
    public void mouseExited(MouseEvent e) {
        // TODO Auto-generated method stub
        String str = "The mouse has exited the Frame";
        System.out.println(str);
    }
}