package test;

import java.awt.*;
import javax.swing.*;

public class demo extends JFrame{
	
	private JButton jb = null;;
	
	public static void main(String[] args){
		
		demo demo1 = new demo();
		
	}
	
	//建構函式
	public demo(){
		jb = new JButton("點我");		
		this.add(jb);
		this.setTitle("你好啊！");
		this.setLocation(100,200);
		this.setSize(300,200) ;
		
		//關閉視窗時保證JVM依然退出
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		this.setVisible(true) ; 
	}
	
}