import javax.swing.*;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

class MyCalc implements ActionListener {

JFrame frame;

public MyCalc() {

frame = new JFrame("Calculator");

Container c = new Container();

JPanel inputPanel = new JPanel();

inputPanel.setLayout(new BorderLayout());

JTextField inputField = new JTextField(50);

inputPanel.add(inputField, BorderLayout.CENTER);

JPanel outputPanel = new JPanel();

outputPanel.setLayout(new BorderLayout());

JTextField outputField = new JTextField(50);

outputPanel.add(outputField, BorderLayout.SOUTH);

JPanel buttons = new JPanel();

buttons.setLayout(new GridLayout(4, 4));

JButton b_0 = new JButton("0");

JButton b_1 = new JButton("1");

JButton b_2 = new JButton("2");

JButton b_3 = new JButton("3");

JButton b_4 = new JButton("4");

JButton b_5 = new JButton("5");

JButton b_6 = new JButton("6");

JButton b_7 = new JButton("7");

JButton b_8 = new JButton("8");

JButton b_9 = new JButton("9");

JButton b_CLR = new JButton("CLEAR");

JButton b_add = new JButton("+");

JButton b_sub = new JButton("-");

JButton b_mul = new JButton("*");

JButton b_div = new JButton("/");

JButton b_EQL = new JButton("=");

buttons.add(b_7);

buttons.add(b_8);

buttons.add(b_9);

buttons.add(b_add);

buttons.add(b_4);

buttons.add(b_5);

buttons.add(b_6);

buttons.add(b_sub);

buttons.add(b_1);

buttons.add(b_2);

buttons.add(b_3);

buttons.add(b_mul);

buttons.add(b_CLR);

buttons.add(b_0);

buttons.add(b_EQL);

buttons.add(b_div);

c.setLayout(new BorderLayout());

c.add(inputPanel, BorderLayout.NORTH);

c.add(buttons, BorderLayout.CENTER);

c.add(outputPanel, BorderLayout.SOUTH);

frame.add(c);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(500, 500);

frame.setVisible(true);

}

@Override

public void actionPerformed(ActionEvent e) {

}

}

public class calc {

public static void main(String[] args) {

MyCalc calc1 = new MyCalc();

}

}