buttondemo.java

这是一个按钮演示程序

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;


public class ButtonDemo extends JFrame {

	/**
	 * @param args
	 */
	private JButton button;
	private Container container;
	public ButtonDemo()
	{
		super("ButtonDemo");
		setSize(300,200);
		container=getContentPane();
		button=new JButton("abc");
		EventHandler eventHandler= new EventHandler();
		button.addActionListener(eventHandler);
		container.add(button,BorderLayout.SOUTH);
		setVisible(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	class EventHandler implements ActionListener{
		public void actionPerformed(ActionEvent event)
		{
		int red=(int)(Math.random()*256);
		int blue=(int)(Math.random()*256);
		int green=(int)(Math.random()*256);
		container.setBackground(new Color(red,green,blue));
		}
	}
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ButtonDemo a=new ButtonDemo();

	}

}