paneldemo.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

package chapter14;
import javax.swing.*;
import java.awt.*;
public class PanelDemo extends JFrame
{
	JPanel pnlMain;
	public PanelDemo()
	{
		 	pnlMain=new JPanel(); 
	 		TopPanel tPanel=new TopPanel();
	 		BottomPanel bPanel=new BottomPanel();
	 		this.setContentPane(pnlMain); 
	 		pnlMain.add(tPanel); 
	 		pnlMain.add(bPanel); 
			setTitle("Panel程序演示");
	 		setSize(250,150);
	 		setVisible(true);
	 		setDefaultCloseOperation(EXIT_ON_CLOSE);
	} 	
	public static void main(String args[])
	{
		new PanelDemo();
	}
}
//上部面板
 class TopPanel extends JPanel
 {
 	JLabel lblWelcome;
 	JLabel lblTop;
 	public TopPanel()
 	{
	 	lblTop=new JLabel("上部面板");
	 	lblWelcome=new JLabel("欢迎进入Java世界!");
	 	add(lblTop);
	 	add(lblWelcome);
 	}
 }
//下部面板
 class BottomPanel extends JPanel
 {
 	JLabel lblBottom;
 	JButton btnExit;
	public BottomPanel()
 	{
	 	lblBottom=new JLabel("下部面板");
	 	btnExit=new JButton("点击退出");
	 	add(lblBottom);
 		add(btnExit);
 	} 	
}