bulgaria

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Color;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.Dimension;

public class bulgaria {
    public static void main(String[] args) {
        JFrame FlagBulgaria = new JFrame();
        FlagBulgaria.setTitle("The National Flag of Bulgaria");
        FlagBulgaria.getContentPane().setPreferredSize(new Dimension(360, 216));
        FlagBulgaria.pack();
        FlagBulgaria.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel PanelOne = new JPanel();
        PanelOne.setBackground(Color.WHITE); //White
        JPanel PanelTwo = new JPanel();
        PanelTwo.setBackground(new Color(0,153,0)); //Green
        JPanel PanelThree = new JPanel();
        PanelThree.setBackground(Color.RED); //Red

        Container pane = FlagBulgaria.getContentPane();
        pane.setLayout(new GridLayout(3, 1));
        pane.add(PanelOne);
        pane.add(PanelTwo);
        pane.add(PanelThree);

        FlagBulgaria.setVisible(true);
    }
}