changebgbutton.java

这是一个在applet中“改背景颜色的按钮”的程序。当鼠标放在按钮上

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

//改变背景与前景颜色的按钮
public class ChangeBgButton extends JButton {
  //改变背景与前景颜色的类
  public ChangeBgButton(String title){
    super(title);
    this.addMouseListener(new ActiveButtonEvent());
  }
  //改变控钮的背景颜色与前景颜色的鼠标事件类
  class ActiveButtonEvent extends MouseAdapter{
    //鼠标移入按钮的背景颜色与前景颜色
    public void mouseEntered(MouseEvent e) {
      ((JButton)e.getSource()).setBackground(new Color(98, 112, 200));
      ((JButton)e.getSource()).setForeground(Color.white);
    }
    //鼠标移出按钮的背景颜色与前景颜色
    public void mouseExited(MouseEvent e) {
      ((JButton)e.getSource()).setBackground(new Color(212, 208, 200));
      ((JButton)e.getSource()).setForeground(Color.black);
    }
    //鼠标单击按钮的背景颜色与前景颜色
    public void mouseClicked(MouseEvent e) {
      ((JButton)e.getSource()).setBackground(new Color(248, 58, 0));
      ((JButton)e.getSource()).setForeground(Color.white);
    }
  }
}