为什么我的字符串不显示在窗口中？

Question

I am trying to create a simple application that shows a red circle that when clicked displays different messages under it. I believe that this part of the code:

g.drawString("DO NOT PRESS", 100, 100);

is coded correctly but no text is displayed on the window that opens. Here is the full code so far:

import java.awt.Graphics;

import javax.swing.JFrame;

public class BigRedButton extends JFrame {

    public BigRedButton() {

        setTitle("Big Red Button");
        setSize(500, 500);
        setResizable(false);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

    public void graphics(Graphics g) {

        g.drawString("DO NOT PRESS", 100, 100);
}
    public static void main(String[] args){

        new BigRedButton();
    }
}

Answer 1

1. There is no such method graphics in JFrame , so nothing is calling it.
2. You should avoid painting directly to top level containers, apart from everthing else, they're not double buffered and will flicker when painted. You should, instead, create a custom component (extending from something like JPanel ) and override it's paintComponent method.
3. You should take the time to read through Performing Custom Painting , Painting in AWT and Swing and 2D Graphics

Also, while your reading up, you should have a read through Initial Threads

Amendment

As pointed out by Andrew, you should use the @Override annotation to ensure that the method you think you are overriding is actually the method being overridden in the first place. This would stop the program from being compiled and save lots of lost time trying to figure out why things aren't working the way you expect them.