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

public class SimpleGUI1 extends JFrame {
    public SimpleGUI1() {
        setTitle("Simple GUI #1");
        getContentPane().setBackground(new Color(0, 0, 255));
    }
    
    public static void main(String[] args) {
        SimpleGUI1 sg = new SimpleGUI1();
        sg.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        sg.setSize(400, 300);
        sg.setVisible(true);    
    }
}