51,397
社区成员




public class TJApplet extends Applet{
@Override
public void start() {
super.start();
JPanel p = new JPanel();
Graphics g = p.getGraphics();
System.out.println(g); //输出null
this.add(p);//关键在这里
g = p.getGraphics();
System.out.println(g);//输出非null
}
}
相信你能看懂