panbtn.java

Java语言

import java.awt.*;
import java.awt.event.*;
public class PanBtn extends Frame implements ActionListener
{
	Label lab=new Label("这是一个小测验的第一题");
	Button b1=new Button("显示");
	public static void main(String[] args)
	{
		new PanBtn();
	}	
	public void actionPerformed(ActionEvent e)
	{
		lab.setText("你喜欢绿色吗？");	
	}
PanBtn()
{
	super("面板中的组件");
	addWindowListener(new WindowAdapter()
	{
		    public void windowClosing(WindowEvent e)
		    {
			System.exit(0);	
		    }	
	});
	setBackground(Color.gray);
	setSize(250,150);
	setLayout(null);
	Panel p1=new Panel();
	Panel p2=new Panel();
	p1.setBackground(Color.green);
	        p2.setBackground(Color.yellow);
		p1.setSize(150,50);		
		p1.setLocation(10,30);
		p2.setSize(50,50);		
		p2.setLocation(160,30);		
		add(p1);
		add(p2);		
		p1.setLayout(new FlowLayout());
		p1.add(lab);
		p2.add(b1);
		b1.addActionListener(this);
		show();
	}
}