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

public class calculator9
{
  public static void main (String[] args)
  { CalcImage Calculator = new CalcImage();
    Calculator.setTitle("Calculator");
    Calculator.show();
  }
}

class CalcImage extends JFrame
{
  public CalcImage()
  {
    final int Window_Width  = 250;
    final int Window_Height = 300;
    setSize(Window_Width, Window_Height);

    // add so that the window closes upon exit
    addWindowListener(new WindowCloser());

    // now define the button elements

    BOne = new JButton("1");
    BTwo = new JButton("2");
    BThree = new JButton("3");
    Bfour = new JButton("4");
    Bfive = new JButton("5");
    Bsix = new JButton("6");
    Bseven = new JButton("7");
    Beight = new JButton("8");
    Bnine = new JButton("9");
    Bzero = new JButton("0");

//coloring the number buttons
    BOne.setBackground(Color.orange);
	BOne.setForeground(Color.blue);
	BTwo.setBackground(Color.orange);
	BTwo.setForeground(Color.blue);
	BThree.setBackground(Color.orange);
	BThree.setForeground(Color.blue);
	Bfour.setBackground(Color.orange);
	Bfour.setForeground(Color.blue);
	Bfive.setBackground(Color.orange);
	Bfive.setForeground(Color.blue);
	Bsix.setBackground(Color.orange);
	Bsix.setForeground(Color.blue);
	Bseven.setBackground(Color.orange);
	Bseven.setForeground(Color.blue);
	Beight.setBackground(Color.orange);
	Beight.setForeground(Color.blue);
	Bnine.setBackground(Color.orange);
	Bnine.setForeground(Color.blue);
	Bzero.setBackground(Color.orange);
	Bzero.setForeground(Color.blue);


    BPlus = new JButton("+");
    BMinus = new JButton("-");
    BDiv = new JButton("/");
    BMult = new JButton("x");
    BEquals = new JButton("=");
    Bclear = new JButton("c");

// colour rest of the buttons
	BPlus.setBackground(Color.yellow);
	BPlus.setForeground(Color.blue);
	BMinus.setBackground(Color.yellow);
	BMinus.setForeground(Color.blue);
	BDiv.setBackground(Color.yellow);
	BDiv.setForeground(Color.blue);
	BMult.setBackground(Color.yellow);
	BMult.setForeground(Color.blue);
	BEquals.setBackground(Color.yellow);
	BEquals.setForeground(Color.blue);
	Bclear.setBackground(Color.yellow);
	Bclear.setForeground(Color.blue);

   // define the listeners
   ActionListener NListener = new NumberListener();
   BOne.addActionListener(NListener);
   BTwo.addActionListener(NListener);
   BThree.addActionListener(NListener);
   Bfour.addActionListener(NListener);
   Bfive.addActionListener(NListener);
   Bsix.addActionListener(NListener);
   Bseven.addActionListener(NListener);
   Beight.addActionListener(NListener);
   Bnine.addActionListener(NListener);
   Bzero.addActionListener(NListener);

      ActionListener OpListener = new OperatorListener();
      BPlus.addActionListener(OpListener);
      BMinus.addActionListener(OpListener);
      BMult.addActionListener(OpListener);
      BDiv.addActionListener(OpListener);
      Bclear.addActionListener(OpListener);

      ActionListener EqListener = new EqualsListener();
      BEquals.addActionListener(EqListener);




    // Define 9-character display area of calculator

    JTextField DisplayArea = new JTextField(9);
    DisplayArea.setEditable(false);
    	DisplayArea.setBackground(Color.blue);

    JTextField DisplayArea2 = new JTextField(9);
    DisplayArea2.setEditable(false);
     	//DisplayArea.setBackground(Color.blue);

   // Define panel for all components

   JPanel SuperPanel = new JPanel();



   //Define the container to hold everything
   Container ScreenPane = getContentPane();

   //Add components to panel

   //DisplayPanel2.setLayout( new GridLayout(4,4));



   DisplayArea.setLayout(new GridLayout(4,4,10,10));

DisplayArea.add(BOne);
DisplayArea.add(BTwo);
DisplayArea.add(BThree);

DisplayArea.add(BPlus);

DisplayArea.add(Bfour);
DisplayArea.add(Bfive);
DisplayArea.add(Bsix);
DisplayArea.add(BMinus);

DisplayArea.add(Bseven);
DisplayArea.add(Beight);
DisplayArea.add(Bnine);
DisplayArea.add(BMult);

DisplayArea.add(Bclear);
DisplayArea.add(Bzero);
DisplayArea.add(BEquals);
DisplayArea.add(BDiv);


DisplayArea2.setLayout(new GridLayout(1,1,1,1));
   DisplayField = new JTextField(9);
   DisplayField.setEditable(false);
   DisplayField.setBackground(Color.white);

 DisplayArea2.add(DisplayField);




//ScreenPane.add(SuperPanel, "Center");

   ScreenPane.add(DisplayArea, "Center");
   ScreenPane.add(DisplayArea2, "South");
         DisplayArea2.setText(display);
}

// the action starts here

   private String     display = "";
   private String     opcode  = "";

  private JTextField DisplayField;

   private double NumericValue = 0;
   private double Total        = 0;


   private class NumberListener implements ActionListener
   // if a number button is clicked, add it to the string of #s


   {  public void actionPerformed(ActionEvent event)
      {
         Object source = event.getSource();

         if (source == BOne)
            display = display + "1";
         else if (source == BTwo)
            display = display + "2";
         else if (source == BThree)
            display = display + "3";
         else if (source == Bfour)
            display = display + "4";
         else if (source == Bfive)
            display = display + "5";
         else if (source == Bsix)
            display = display + "6";
         else if (source == Bseven)
            display = display + "7";
         else if (source == Beight)
            display = display + "8";
         else if (source == Bnine)
            display = display + "9";
         else if (source == Bzero)
            display = display + "0";

         DisplayField.setText(display);
      }
   }


   private class OperatorListener implements ActionListener
   // if an operator is clicked, save the number,
   //   and keep track of which operation will happen
   //   after the second number is entered

   {  public void actionPerformed(ActionEvent event)
      {
         NumericValue  = Double.parseDouble(display);
         Total         = NumericValue;
         display       = "";

         Object source = event.getSource();

         if (source == BPlus)
            opcode = "+";
         else if (source == BMinus)
            opcode = "-";
         else if (source == BMult)
            opcode = "*";
         else if (source == BDiv)
            opcode = "/";
         else if (source == Bclear)
         {  opcode = "";
            Total = 0;
            display = "";
            DisplayField.setText(display);
         }
      }
   }

      private class EqualsListener implements ActionListener
      // if the equals button is clicked, get the number
      // from the string and then update the Total
      // using the previously saved operation code

      {  public void actionPerformed(ActionEvent event)
         {
            NumericValue  = Double.parseDouble(display);

            if (opcode == "+")
               Total = Total + NumericValue;
            else if (opcode == "-")
               Total = Total - NumericValue;
            else if (opcode == "*")
               Total = Total * NumericValue;
            else if (opcode == "/")
               Total = Total / NumericValue;

            display = String.valueOf(Total);
            DisplayField.setText(display);

         }
      }


   private JButton  BOne, BTwo, BThree, Bfour, Bfive, Bsix, Bseven, Beight, Bnine, Bzero,
   BPlus, BMinus, BDiv, BMult, BEquals, Bdot, Bclear;

   private JTextField DisplayArea, DisplayArea2;


   private class WindowCloser extends WindowAdapter
   {  public void windowClosing(WindowEvent event)
     {  System.exit(0);
     }
 }

}