helloworld.java

中国水利水电出版社java程序设计教程,附源码

//HelloWorld

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

public class HelloWorld
{ 
	public static void main(String[] args)
	{  
		TextFrame frame = new TextFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.show();
	}
}

class TextFrame extends JFrame
{
	public TextFrame()
	{
		setTitle("HelloWorld");
		setSize(WIDTH, HEIGHT);
		
		//将panel加入到frame
		TextPanel panel = new TextPanel();
		Container contentPane = getContentPane();
		contentPane.add(panel);
	}
	
	public static final int WIDTH = 300;
	public static final int HEIGHT = 200;  	
}

class TextPanel extends JPanel
{  
	public void paintComponent(Graphics g)
	{  
		super.paintComponent(g);
		
		//显示文本
		g.drawString(" Hello, World!", x, y);
	}
	
	public int x = 100;
	public int y = 100;
}