paneldemo.java

学习参考,java基本语法练习,包括一些常用的技巧

/*
 *该示例演示了使用JPanel布局组件
 */
 import javax.swing.*;
 import java.awt.*;
 public class PanelDemo extends JFrame
 {
 	JPanel pnlMain;
 	public PanelDemo()
 	{
	 	pnlMain=new JPanel(new GridLayout(2,1));//设置pnlMain为网格布局方式
 		TopPanel tPanel=new TopPanel();
 		BottomPanel bPanel=new BottomPanel();
 		this.setContentPane(pnlMain);//设置pnlMain为Frame的容器
 		//this.getContentPane().add(pnlMain);
 		pnlMain.add(tPanel);		 //将tPanel面板添加到pnlMain上
 		pnlMain.add(bPanel);		 //将bPanel面板添加到pnlMain上
 		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()
 	{
	 	lblWelcome=new JLabel("欢迎进入Java世界!");
	 	lblTop=new JLabel("上部面板");
	 	setLayout(new GridLayout(2,1));//设置topPanel为网格布局方式
	 	add(lblWelcome);
	 	add(lblTop);
 	}
 }
 //下部面板
 class BottomPanel extends JPanel
 {
 	JLabel lblBottom;
 	JButton btnExit;
 	
 	public BottomPanel()
 	{
	 	//bottomPanel缺为流布局方式
	 	lblBottom=new JLabel("下部面板");
	 	btnExit=new JButton("点击退出");
	 	add(lblBottom);
 		add(btnExit);
 	} 	
 }