JavaSE 事件监听器接口

package sup.orange.learn;

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.ImageObserver;
import java.text.AttributedCharacterIterator;

/**
 * Created by re-x on 11/2/14.
 */
public class AdapterDemo {

    private Frame f;
    Point start, end;
    Panel panel;

    public AdapterDemo () {
        f = new Frame("click or drag mouse");
        panel = new Panel();
        f.add("Center", panel);

        panel.addMouseListener(new MouseAdapter() {
            public void mousePressed(MouseEvent e) {
                start = e.getPoint();
                System.out.println("start "+start);
            }

            public void mouseReleased(MouseEvent e) {
                end = e.getPoint();
                System.out.println("end "+end);
                Graphics g = panel.getGraphics();
                panel.paint(g);
                g.drawLine(start.x, start.y, end.x, end.y);

            }
        });

        f.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                System.exit(1);
            }
        });

        f.setSize(300, 400);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        new AdapterDemo();
    }
}