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);

    }

}