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

public class Square extends JFrame implements ActionListener {
     
    private JTextField input = new JTextField();

    public Square() {
        super("Square GUI");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new GridLayout(1,2));
	JButton button;
	button= new JButton("Square");
        add(button);
        add(input);
        button.addActionListener(this);
        pack();
        setVisible( true );
    }

    public void actionPerformed(ActionEvent e) {
        int v = Integer.parseInt(input.getText());
        input.setText(Integer.toString(v*v));
    }

    public static void main(String[] args) {
	new Square();
    }
    
}