import java.awt.*;
import javax.swing.*;
public class AppGUI extends JFrame {
 public AppGUI(){
	 setTitle("AppGUI");
	 JPanel leftPanel = new JPanel();
	 JPanel centerPanel = new JPanel();

	 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+");

	 leftPanel.add(b1);
	 leftPanel.add(b2);
	 leftPanel.add(b3);
	 leftPanel.add(b4);

	 JButton c1 = new JButton("7");
	 JButton c2 = new JButton("8");
	 JButton c3 = new JButton("9");
	 JButton c4 = new JButton("4");
	 JButton c5 = new JButton("5");
	 JButton c6 = new JButton("6");
	 JButton c7 = new JButton("1");
	 JButton c8 = new JButton("2");
	 JButton c9 = new JButton("3");
	 JButton c10 = new JButton("0");
	 JButton c11 = new JButton(".");
	 JButton c12 = new JButton("=");

	 JButton r1 = new JButton("+");
	 JButton r2 = new JButton("-");
	 JButton r3 = new JButton("*");
	 JButton r4 = new JButton("/");

centerPanel.add(c1);
centerPanel.add(c2);
centerPanel.add(c3);
centerPanel.add(c4);
centerPanel.add(c5);
centerPanel.add(c6);
centerPanel.add(c7);
centerPanel.add(c8);
centerPanel.add(c9);
centerPanel.add(c10);
centerPanel.add(c11);
centerPanel.add(c12);
	 centerPanel.add(r1);
	 centerPanel.add(r2);
	 centerPanel.add(r3);
	 centerPanel.add(r4);

	 leftPanel.setLayout(new GridLayout(4,1, 20, 20));
	centerPanel.setLayout(new GridLayout(4,4, 20, 20));


	 add(display, BorderLayout.PAGE_START);
	 add(leftPanel, BorderLayout.LINE_START);
	 add(centerPanel, 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);
 }
}