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import javax.swing.*;

class First{
    public static void main(String args[]){

        JFrame frame = new JFrame("Title");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Second s = new Second();
        frame.add(s);
        frame.setSize(400, 250);
        frame.setVisible(true);
        frame.setResizable(false);
    }
}

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.Formatter;
import java.util.Scanner;

// Making a class that inherits JPanel methods etc.
public class Second extends JPanel {


    // Creating a paintComponent method from JPanel libraries
    public void paintComponent(Graphics g){

        // Calling the super class component methods
        super.paintComponent(g);

        // Setting the background to WHITE
        this.setBackground(Color.WHITE);


        // Making a rectangle and setting its color to blue
        g.setColor(Color.BLUE);
        // Making the rectangle and positioning it and giving it proportions
        g.fillRect(25, 25, 100, 30);

        // Making a custom RGB colorw
        g.setColor(new Color(215, 67, 53));
        g.fillRect(25, 65,100, 30);

        // Making colored text
        g.setColor(Color.BLUE);
        g.drawString("Colored Text", 25, 120);

    }

}