Paint Component Method不适用于JFrame [英] Paint Component Method not working for JFrame

问题描述

我试图在尝试使用JLabel之后在屏幕上绘制图像，现在我正在尝试使用paintComponent方法。我在看到没有结果后尝试插入断点，并且没有调用该方法，也没有出现任何结果。我该怎么办？这是我的重要代码 -

I'm trying to paint an image on the screen after trying to use JLabel's and am now trying the paintComponent method. I tried inserting breakpoints after seeing no results and the method doesn't get called, and nothing appears. What should I do? Here is my important code-

`

     public void createWindow(){        

            frame.setVisible(true);  
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLocationRelativeTo(null);
    frame.pack();
    frame.setSize(xSize, ySize);
            frame.setLocation(0, 0);
            frame.addComponentListener(this);
            //frame.add(im);             

    }

public void paintComponent（Graphics g ）{
super.paintComponent（g）;
g.drawImage（占位符，0,0，getWidth（），getHeight（），null）;
g.drawString（你好，100,100）;
}

此外，我使用JFrame代替JPanel或组件，如果这有所不同。

Also I'm using a JFrame instead of JPanel or component if that makes a difference.

推荐答案

JFrame 没有 paintComponent 方法。您应该避免直接绘制到框架，而是使用 JPanel 并覆盖其 paintComponent 方法

JFrame does not have a paintComponent method. You should avoid painting directly to a frame and instead use a JPanel and override its paintComponent method

您还应该使用@Override注释，如果父类没有您尝试覆盖的方法，则会引发编译器异常...

You should also make use of the @Override annotation, which will raise a compiler exception if the parent class does not have the method you are trying to override...

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