exam11_5.java

java学习课件

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Exam11_5 extends JFrame implements ActionListener 
{
  JButton bt1=new JButton("改变颜色");
  JPanel jp1=new JPanel(); 
  public Exam11_5()
  {
	Container pane=this.getContentPane();
	pane.setLayout(new FlowLayout());
	pane.add(jp1);
	jp1.add(new JLabel("这是一个改变对象背景的示例!"));
	pane.add(bt1);
	bt1.addActionListener(this);
	setSize(200,200);
	setVisible(true);
	setTitle("演示颜色对话框");
	setDefaultCloseOperation(3);
  }
  public static void main(String args[])
  {
	new Exam11_5();
  }
  public void actionPerformed(ActionEvent e)
  {
	Color c=JColorChooser.showDialog(null,"调色板",jp1.getBackground());
	jp1.setBackground(c);		
  }	
}