OOPS-lab-codes/ColorSelector.java

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

public class ColorSelector extends JFrame implements ActionListener {

    JCheckBox redCheckBox, greenCheckBox, blueCheckBox;
    JButton applyButton;
    JLabel colorLabel;

    public ColorSelector() {

        setTitle("Color Selector");
        setSize(400, 250);
        setLayout(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Checkboxes
        redCheckBox = new JCheckBox("Red");
        greenCheckBox = new JCheckBox("Green");
        blueCheckBox = new JCheckBox("Blue");

        redCheckBox.setBounds(50, 30, 100, 30);
        greenCheckBox.setBounds(150, 30, 100, 30);
        blueCheckBox.setBounds(250, 30, 100, 30);

        // Button
        applyButton = new JButton("Apply Color");
        applyButton.setBounds(130, 80, 140, 30);
        applyButton.addActionListener(this);

        // Label
        colorLabel = new JLabel("Selected Color", JLabel.CENTER);
        colorLabel.setBounds(80, 130, 240, 60);
        colorLabel.setOpaque(true);                 // REQUIRED
        colorLabel.setBorder(BorderFactory.createLineBorder(Color.BLACK)); // REQUIRED

        // Add components
        add(redCheckBox);
        add(greenCheckBox);
        add(blueCheckBox);
        add(applyButton);
        add(colorLabel);

        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {

        boolean red = redCheckBox.isSelected();
        boolean green = greenCheckBox.isSelected();
        boolean blue = blueCheckBox.isSelected();

        if (red && !green && !blue) {
            colorLabel.setBackground(Color.RED);
            colorLabel.setText("RED");
        }
        else if (!red && green && !blue) {
            colorLabel.setBackground(Color.GREEN);
            colorLabel.setText("GREEN");
        }
        else if (!red && !green && blue) {
            colorLabel.setBackground(Color.BLUE);
            colorLabel.setText("BLUE");
        }
        else if (red && green && !blue) {
            colorLabel.setBackground(Color.YELLOW);
            colorLabel.setText("YELLOW");
        }
        else if (red && !green && blue) {
            colorLabel.setBackground(Color.MAGENTA);
            colorLabel.setText("MAGENTA");
        }
        else if (!red && green && blue) {
            colorLabel.setBackground(Color.CYAN);
            colorLabel.setText("CYAN");
        }
        else if (red && green && blue) {
            colorLabel.setBackground(Color.WHITE);
            colorLabel.setText("WHITE");
        }
        else {
            colorLabel.setBackground(null);
            colorLabel.setText("No color selected");
        }
    }

    public static void main(String[] args) {
        new ColorSelector();
    }
}