Gui.java

import java.awt.BorderLayout;
import java.awt.GridLayout;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Gui {
    Gui() {
        JFrame frame = new JFrame();
        JPanel panel = new JPanel();
        panel.setBorder(BorderFactory.createEmptyBorder(500, 500, 500, 500));
        panel.setLayout(new GridLayout());
        frame.add(panel, BorderLayout.CENTER);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("Frame");
        frame.pack();
        frame.setVisible(true);
    }

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