package graphics;

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

public class ButtonApplication {
   public static void main(String[] args) {
      JFrame window = new JFrame("Frame with buttons in a panel");
      window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      // Set up the primary panel
      JPanel primary = new JPanel();
      primary.setBackground(Color.black);

      // Add three buttons to the primary panel
      JButton button1 = new JButton("red");
      primary.add(button1);
      JButton button2 = new JButton("green");
      primary.add(button2);
      JButton button3 = new JButton("blue");
      primary.add(button3);

      // Add the primary panel to the frame and display
      window.getContentPane().add(primary); // component added to content pane
      window.pack(); // sets the frame's size to accommodate its components
      window.setVisible(true); // displays the frame
   }
}