import java.awt.*;
import javax.swing.*;
public class AppGUI extends JFrame {
 public AppGUI(){
 setTitle("AppGUI");
 JPanel p1 = new JPanel();
 JPanel p2 = new JPanel();
 //p1.setBackground(Color.RED);
 JTextField display = new JTextField("0.0");
 JButton b1 = new JButton("MC");
 JButton b2 = new JButton("MR");
 JButton b3 = new JButton("MS");
 JButton b4 = new JButton("M+");
 p1.setLayout(new GridLayout(4,4));
 JButton a1 = new JButton("1");
 JButton a2 = new JButton("2");
 JButton a3 = new JButton("3");
 JButton a4 = new JButton("4");
 JButton a5 = new JButton("5");
 JButton a6 = new JButton("6");
 JButton a7 = new JButton("7");
 JButton a8 = new JButton("8");
 JButton a9 = new JButton("9");
 JButton a10 = new JButton("0");
 JButton a11 = new JButton(".");
 JButton a12 = new JButton("=");

 JButton c1 = new JButton("+");
 JButton c2 = new JButton("-");
 JButton c3 = new JButton("*");
 JButton c4 = new JButton("/");

 p2.setLayout(new GridLayout(4,1));
 p2.add(b1);
 p2.add(b2);
 p2.add(b3);
 p2.add(b4);

 p1.add(a9);
 p1.add(a8);
 p1.add(a7);
 p1.add(c1);
 p1.add(a6);
 p1.add(a5);
 p1.add(a4);
 p1.add(c2);
 p1.add(a3);
 p1.add(a2);
 p1.add(a1);
 p1.add(c3);
 p1.add(a10);
 p1.add(a11);
 p1.add(a12);
 p1.add(c4);

 add(display,BorderLayout.PAGE_START);
 add(p2,BorderLayout.LINE_START);
 add(p1, BorderLayout.CENTER);
 }
 public static void main(String[] args){
 AppGUI frame = new AppGUI();
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setSize(600, 500);
 frame.setVisible(true);
 }
}