Drawing Squares

To draw shapes like squares in Swing, we use the paintComponent method. This method allows us to define how components are visually rendered inside a panel. Here's how to create a simple program that draws a square.

import javax.swing.*;
import java.awt.*;

public class Main {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Drawing a Square");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 400);

        JPanel panel = new JPanel() {
            @Override
            protected void paintComponent(Graphics g) {
                super.paintComponent(g); // Clears the panel for fresh drawing
                g.setColor(Color.BLUE);  // Set the drawing color to blue
                g.fillRect(50, 50, 100, 100); // Draw a square at (50, 50) with size 100x100
            }
        };

        frame.add(panel); // Add the panel to the frame
        frame.setVisible(true); // Make the frame visible
    }
}