// TestDrawString.java
import java.awt.*;
import javax.swing.*;
//主框架类
public class TestDrawString extends JFrame
{
	public TestDrawString()
	{
		setTitle("TestDrawString");
		this.getContentPane().add(new MyPanel());
	}
	public static void main(String[] args)
	{
		TestDrawString frame = new TestDrawString();
		frame.setSize(200,100);
		frame.setVisible(true);
	}
}
//定义一个可以显示图形的面板类
class MyPanel extends JPanel
{
	public void paintComponent(Graphics g)
	{
		//调用父类的paintComponent方法进行初始绘制
		super.paintComponent(g);
		//绘制文本
		g.drawString("Hello World!!!",20,30);
	}
}