java语言自定义一个按钮鼠标移入和移出，点击左键时能改变外观

import java.awt.*;
import javax.swing.*;
public class TextDemo
{
JFrame f;
Container c;
JButton b;
static JLabel l;
public TextDemo()
{
f=new JFrame();
c=f.getContentPane();
c.setLayout(new FlowLayout());

b=new JButton("OKOK");
b.addMouseListener(new MouseService());
l=new JLabel("");
Font font=new Font("楷体",Font.BOLD,16);
l.setFont(font);
l.setForeground(Color.red);

c.add(b);
c.add(l);

f.setSize(400,400);
f.setVisible(true);
}
public static void main(String args[])
{
new TextDemo();
}
}

import java.awt.event.*;
public class MouseService implements MouseListener
{
//鼠标的单击事件
public void mouseClicked(MouseEvent m)
{
TextDemo.l.setText("鼠标被单击了一下");
if(m.isMetaDown())
{
System.out.println("右键被点击");
}
else if(m.isAltDown())
{
System.out.println("中键被点击");
}
else
{
System.out.println("左键被点击");
}
}
//鼠标光标进入组件时产生的事件
public void mouseEntered(MouseEvent m)
{
TextDemo.l.setText("鼠标的光标进入了按钮组件");
}
//鼠标光标离开组件时产生的事件
public void mouseExited(MouseEvent m)
{
TextDemo.l.setText("鼠标的光标离开按钮组件");
}
//鼠标按键按下事件
public void mousePressed(MouseEvent m)
{
TextDemo.l.setText("鼠标的按键被按下");
}
//鼠标按键被释放时的事件
public void mouseReleased(MouseEvent m)
{
TextDemo.l.setText("鼠标的按键被释放");
}
}

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