mycolor2.java

来自「java小程序」· Java 代码 · 共 36 行

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
//import MyWindowListener;
public class MyColor2 extends JFrame implements ActionListener
{
private JButton changeColor;
private Color color=Color.lightGray;
private Container c;
public MyColor2()
{
super("MyColor2:使用JColorChoose元件");
c=getContentPane();
c.setLayout(new FlowLayout());//以**为版面配置管理者；设置布局管理器
changeColor=new JButton("改变背景颜色");
changeColor.addActionListener(this);
c.add(changeColor);
setSize(300,80);
setVisible(true);//新方法。
//show();//旧方法。
}
public void actionPerformed(ActionEvent e)
{
color=JColorChooser.showDialog(this,"选色",color);
if(color==null) color=Color.lightGray;
c.setBackground(color);
c.repaint();
}
public static void main(String args[])
{
MyColor2 app=new MyColor2();
app.addWindowListener(new MyWindowListener());
}
}