drawString prints string over a screenshot of my current window

问题

When I run this code in Eclipse I get a the string and line printing in a new windows, but instead of a blank window it simply is a screenshot of my current window, set to the size I declare.

http://i.imgur.com/nWFN9YJ.png

Any suggestions on what I'm doing wrong?

import java.awt.Graphics;
import javax.swing.JFrame;


public class EmptyFrame2 extends JFrame
{

public static void main(String args[])
{
    EmptyFrame2 JF=new EmptyFrame2();
    JF.setSize(1000,500);
    JF.setVisible(true);
}
public void paint(Graphics g)
{
    g.drawString("Hello",50,50);
    //g.drawLine(50-2, 50+2, 50+70, 50+2);
}

If this is too vague let me know and I'll change it or add whatever else you need.

回答1:

• Avoid overriding paint of top level components
• Avoid breaking the paint chain, making super you call super.paintXxx
• Override paintComponent of something like JPanel instead

See Performing Custom Painting

回答2:

Try adding super.paint(g) to your paint() method.

来源：https://stackoverflow.com/questions/21146397/drawstring-prints-string-over-a-screenshot-of-my-current-window