import javax.swing.*;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class Set1_Calc {

public static void main(String[] args) {

JFrame frame = new JFrame();

Container container = new Container();

JTextField textfield = new JTextField(4);

JButton btn1 = new JButton("1");

JButton btn2 = new JButton("2");

JButton btn3 = new JButton("3");

JButton btnC = new JButton("C");

JButton btn4 = new JButton("4");

JButton btn5 = new JButton("5");

JButton btn6 = new JButton("6");

JButton btnadd = new JButton("+");

JButton btn7 = new JButton("7");

JButton btn8 = new JButton("8");

JButton btn9 = new JButton("9");

JButton btnsub = new JButton("-");

JButton btn0 = new JButton("0");

JButton btndot = new JButton(".");

JButton btndiv = new JButton("/");

JButton btnmultiply = new JButton("*");

JPanel mainPanel = new JPanel(new GridLayout(4, 4));

mainPanel.add(btn1);

mainPanel.add(btn2);

mainPanel.add(btn3);

mainPanel.add(btnC);

mainPanel.add(btn4);

mainPanel.add(btn5);

mainPanel.add(btn6);

mainPanel.add(btnadd);

mainPanel.add(btn7);

mainPanel.add(btn8);

mainPanel.add(btn9);

mainPanel.add(btnsub);

mainPanel.add(btn0);

mainPanel.add(btndot);

mainPanel.add(btndiv);

mainPanel.add(btnmultiply);

JPanel topRowPanel = new JPanel(new GridLayout(1, 4));

topRowPanel.add(textfield);

container.setLayout(new BorderLayout());

container.add(mainPanel, BorderLayout.CENTER);

container.add(topRowPanel, BorderLayout.NORTH);

frame.setSize(500, 500);

frame.setVisible(true);

frame.add(container);

btnC.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textfield.setText(null);

}

});

}

}