This class is the stand-alone class  .it does all the work
 N. Gattuso -- 01/13/2014
 ****************************************************************** */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MyWindowFrame extends JFrame {

	private Container pane;
	private JTextField textField;

   //The constructor
	public MyWindowFrame() {

		//create a pane to work in..
		pane=getContentPane();
	    //set the layout of the pane to null
      	pane.setLayout(null);

        JMenuBar menuBar = new JMenuBar();
        JMenu menuFile = new JMenu();
        JMenuItem menuFileExit = new JMenuItem();

        menuFile.setText("File");
        menuFileExit.setText("Exit");

        // Add action listener.for the menu button
        menuFileExit.addActionListener

        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    MyWindowFrame.this.windowClosed();
                }
            }
        );



        menuFile.add(menuFileExit);
        menuBar.add(menuFile);

        setTitle("Calculator");
        setJMenuBar(menuBar);
        setSize(new Dimension(600, 1000));


       JButton zero = new JButton("0");
        pane.add(zero);
        zero.setLocation(50, 850);
        zero.setSize(300, 100);
    	zero.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    zero.setText(text + "0");
                }
            }
        );



      JButton one= new JButton("1");
        pane.add(one);
        one.setLocation(50, 750);
        one.setSize(100, 100);
    	one.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {

                	String text = textField.getText();
                    one.setText(text + "1");

                }
            }
        );





      JButton two= new JButton("2");
        pane.add(two);
        two.setLocation(150, 750);
        two.setSize(100, 100);
    	two.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    two.setText(text + "1");

                }
            }
        );




      JButton four = new JButton("4");
        pane.add(four);
        four.setLocation(50, 650);
        four.setSize(100, 100);
    	four.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    four.setText(text + "1");
                }
            }
        );





      JButton five = new JButton("5");
        pane.add(five);
        five.setLocation(150, 650);
        five.setSize(100, 100);
    	five.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    five.setText(text + "1");
                }
            }
        );





      JButton six = new JButton("6");
        pane.add(six);
        six.setLocation(250, 650);
        six.setSize(100, 100);
    	six.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    six.setText(text + "6");
                }
            }
        );






      JButton seven = new JButton("7");
        pane.add(seven);
        seven.setLocation(50, 550);
        seven.setSize(100, 100);
    	seven.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    seven.setText(text + "7");
                }
            }
        );




      JButton eight = new JButton("8");
        pane.add(eight);
        eight.setLocation(150, 550);
        eight.setSize(100, 100);
    	eight.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    eight.setText(text + "8");
                }
            }
        );











      JButton nine= new JButton("9");
        pane.add(nine);
        nine.setLocation(250, 550);
        nine.setSize(100, 100);
    	nine.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    nine.setText(text + "9");
                }
            }
        );







        JButton minus= new JButton("--");
        pane.add(minus);
        minus.setLocation(450, 650);
        minus.setSize(100, 100);
    	minus.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    minus.setText(text + "--");
                }
            }
        );





        JButton divide= new JButton("÷");
        pane.add(divide);
        divide.setLocation(450, 450);
        divide.setSize(100, 100);
    	divide.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    divide.setText(text + "÷");
                }
            }
        );





        JButton times= new JButton("x");
        pane.add(times);
        times.setLocation(450, 550);
        times.setSize(100, 100);
    	times.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    times.setText(text + "x");
                }
            }
        );








        JButton three= new JButton("3");
        pane.add(three);
        three.setLocation(250, 750);
        three.setSize(100, 100);
    	three.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    three.setText(text + "3");
                }
            }
        );









        JButton equals = new JButton("=");
        pane.add(equals);
        equals.setLocation(450, 850);
        equals.setSize(100, 100);
    	equals.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    equals.setText(text + "=");
                }
            }
        );





          JButton button1 = new JButton("+");
        pane.add(button1);
        button1.setLocation(450, 750);
        button1.setSize(100, 100);
    	button1.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                	String text = textField.getText();
                    button1.setText(text + "+");
                }
            }
        );






        // Add window listener. to window
        this.addWindowListener
        (
            new WindowAdapter() {
                public void windowClosing(WindowEvent e) {
                    MyWindowFrame.this.windowClosed();
                }
            }
        );


    }


    /**
     * Shutdown procedure when run as an application.
     */
    protected void windowClosed() {

    	// TODO: Check if it is safe to close the application

        // Exit application.
        System.exit(0);
    }
}