I am working on a Java program to draw the Botswana flag. Here are my instructio

Question

I am working on a Java program to draw the Botswana flag. Here are my instructions:

Write a Java program to produce the flag of Botswana. Make sure the shape is rectangular.The blue
hue is azure blue. Center the flag on the screen.

Here is what I have written:

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

public class Flag extends JComponent
{

    public void flagComponent(Graphics g)
    {
        Color azure = new Color(0,127,255);
        g.setColor(azure);
        g.fillRect(100,100,90,22);
       
        g.setColor(Color.WHITE);
        g.fillRect(100,122,90,3);
       
        g.setColor(Color.BLACK);
        g.fillRect(100,125,90,10);
       
        g.setColor(Color.WHITE);
        g.fillRect(100,135,90,3);
       
        g.setColor(azure);
        g.fillRect(100,138,90,22);
    }
}

class flagViewer
{   
    public static void main(String[] args)
    {
        JFrame frame = new JFrame();
       
        frame.setSize(290,260);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JComponent component = new Flag();
        frame.add(component);
        frame.setVisible(true);
    }
}

It doesn't work. Where did I go wrong? Help!

Explanation / Answer

2 things:

your render method must be called internally by java. Java calls the paint(Graphics g) method whenver the component needs to be rendered. Renaming flagComponent to paint should suffice

Also, I believe main has to be inside the public class, so putting your main method inside your flag class would suffice. You do not need a separate class for flag viewer anyway

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