Mine

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

public class TestPanels extends JFrame {
    public TestPanels() {
        JPanel p1 = new JPanel();
        JPanel p2 = new JPanel(new BorderLayout());
        p1.setLayout(new GridLayout(4,3));

        for(int i = 1; i <= 9; i++) {
            p1.add(new JButton("" + i));
        }

        p1.add(new JButton("0"));
        p1.add(new JButton("Start"));
        p1.add(new JButton("Stop"));

        p2.add(new JTextField("Time to be displayed"), BorderLayout.NORTH);
        p2.add(p1, BorderLayout.CENTER);

        add(p2, BorderLayout.EAST);
        add(new JButton("Food goes here"), BorderLayout.CENTER);
    }

    public static void main(String[] args) {
        TestPanels sfl = new TestPanels();

        sfl.setTitle("Microwave Oven");
        sfl.setLocationRelativeTo(null);
        sfl.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        sfl.setSize(400,250);
        sfl.setVisible(true);
    }
}