JavaSE 鼠标事件类（MouseEvent）实现

{相关信息}
鼠标事件类(MouseEvent)指组件中发生的鼠标动作事件,例如按下鼠标、释放鼠标、单击鼠标、鼠标光标进入或离开组件的几何 图形、移动鼠标、拖动鼠标。当鼠标移动到某个区域或鼠标单击某个组件时就会触发鼠标事件。使用鼠标事件必须给组件添加一个MouseListener 接口的事件处理器,该接口包含以下 5 个方法：
void mouseClicked(MouseEvent e):当鼠标在该区域单击时发生
void mouseEntered(MouseEvent e):当鼠标进入该区域时发生
void mouseExited(MouseEvent e):当鼠标离开该区域时发生
void mousePressed(MouseEvent e):当鼠标在该区域按下时发生
void mouseReleased(MouseEvent e):当鼠标在该区域放开时发生

{实现效果图}
实验过程中，在panel区，明显可以看出单击可按下的区别。按一下马上松开是一个点击，获取一次位置信息。
如果按下不松开，移动后一会儿，再松开，不会获取位置信息。

{相关代码}

package sup.orange.learn;

import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

/**
 * Created by re-x on 11/2/14.
 */
public class MouseEventDemo extends Frame {

    Panel panel;
    TextField textfield1, textfield2;

    public MouseEventDemo () {
        super();
        init();
    }

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

    public void init() {
        setLayout(new GridLayout(3, 1));
        textfield1 = new TextField(30);
        textfield2 = new TextField();
        add(textfield1);
        add(textfield2);

        panel = new Panel();
        panel.setBackground(Color.CYAN);
        add(panel);

        panel.addMouseListener(new MouseListener() {
            @Override
            public void mouseClicked(MouseEvent e) {
                textfield2.setText("x="+e.getX()+";y="+e.getY());
            }

            @Override
            public void mousePressed(MouseEvent e) {
                textfield1.setText("mouse pressed");
            }

            @Override
            public void mouseReleased(MouseEvent e) {
                textfield1.setText("mouse released");
            }

            @Override
            public void mouseEntered(MouseEvent e) {
                textfield1.setText("mouse entered");
            }

            @Override
            public void mouseExited(MouseEvent e) {
                textfield1.setText("mouse exited");
            }
        });

        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                dispose();
                System.exit(0);
            }
        });

        setSize(200, 300);
        setVisible(true);
    }
}