请教

[roemin]

import javax.swing.*;
import java.awt.*;
public class DrawMessage extends JPanel{
public static void main(String[] a){
JFrame.frame=new JFrame("DrawMessage");
frame.getContentPane().add(new DrawMessage());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300,200);
frame.setVisible(true);
}

protected void paintComponent(Graphics g){
super.paintComponent(g);
g.drawString("Welcome to java!",40,40);
}

为什么说找不到方法。请各位帮我改改。谢谢~~~~~~

[numen_wlm]

import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JPanel;
public class Test extends JPanel{ 
 public static void main(String[] a){ 
   JFrame frame=new JFrame("DrawMessage"); 
   frame.getContentPane().add(new Test()); 
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
   frame.setSize(300,200); 
   frame.setVisible(true); 
} 

protected void paintComponent(Graphics g){ 
  super.paintComponent(g); 
  g.drawString("Welcome to java!",40,40); 
}
}

[li.jianfei]

第一位说的是对的

[anqini]

[Quote=引用 1 楼 yjntue 的回复:]
JFrame.frame=new JFrame("DrawMessage");
======================================
应该为:
JFrame frame=new JFrame("DrawMessage");
[/Quote]

[roemin]

为什么开头写上这个就没有错import java.awt.Graphics;
而写成这样就错了import java.awt.*;