drawString在我当前窗口的屏幕快照上打印字符串 [英] drawString prints string over a screenshot of my current window

问题描述

当我在Eclipse中运行此代码时，我在新窗口中获得了字符串和行打印，但是它不是空白窗口，而是我当前窗口的屏幕快照，设置为我声明的大小.

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

关于我在做什么错的任何建议?

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);
}

如果这太含糊，请告诉我，我将对其进行更改或添加您需要的其他任何内容.

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

推荐答案

• 避免覆盖顶级组件的paint
• 避免打破油漆链，让您超级称呼super.paintXxx
• 改用JPanel之类的paintComponent代替
• 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

请参见执行自定义绘画

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