Hacer calculadora cientifica hecha en java con jcreator por medio de una interfaz AWT usando eventos en los botones

Este código java muestra cómo hacer una calculadora científica, usando interfaces graficas awt y diferentes manejos de eventos, no tiene mucha complejidad lógica solo manejo de interfaces y los métodos de java para operaciones matemáticas, y el ordenar los componentes por gridlayout y el flowlayout. Poner todo el codigo en un archivo llamado Calc

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Container;

import java.awt.Cursor;

import java.awt.Dimension;

import java.awt.FlowLayout;

import java.awt.GridLayout;

import java.awt.Insets;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.io.IOException;

import javax.swing.ButtonGroup;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

import javax.swing.JTextField;

import javax.swing.UIManager;

import javax.swing.WindowConstants;

import javax.swing.border.EmptyBorder;

public class Calc extends JFrame implements ActionListener,MouseListener    //,KeyListener

{

  private JButton      jb_one,jb_two,jb_three,jb_four,jb_five,jb_six,jb_seven,jb_eight,jb_nine,jb_zero;

  private JButton      jb_plus,jb_minus,jb_divide,jb_multiply;

  private JButton      jb_sin,jb_cos,jb_tan,jb_asin,jb_acos,jb_atan,jb_pie,jb_E;

  private JButton      jb_decimalpoint,jb_equalto,jb_fact,jb_power,jb_changesign,jb_reciporcal;

  private JButton      jb_todeg,jb_torad,jb_round,jb_CA,jb_CE,jb_Backspace;

  private JRadioButton jrb_deg,jrb_rad;

  private ButtonGroup  jrb_group;

  private JTextField   jtf_display;

  private JLabel       jl_url;

  private double       tempdisplayNum;

  boolean              plusPressed,minusPressed,mulPressed,divPressed,equalPressed,powerPressed;

  public Calc()

  {

      super("Scientic Calculator ( Currently running on JVM Version " + System.getProperty("java.version") + " )");

 

   //   setIconImage(Toolkit.getDefaultToolkit().getImage(Calc.class.getResource("calc.gif"))); si quieres poner imagen

                          setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);

      addWindowListener(new WindowAdapter()

      {

         public void windowClosing(WindowEvent e)

            {

               Calc.this.dispose();

               System.runFinalization();

               System.gc();

               System.exit(0);

            }

      });

      tempdisplayNum = 0;

      resetAllButton();

      equalPressed = false;

      JPanel jp_main = new JPanel();

      jp_main.setLayout(new BorderLayout());

      jp_main.setBorder(new EmptyBorder(new Insets(3,5,5,5)));

      JPanel jp_top = new JPanel();

      jp_top.setLayout(new BorderLayout());

      JPanel jp_top_down = new JPanel();

      jp_top_down.setLayout(new BorderLayout());

      JPanel jp_top_west = new JPanel();

      jb_Backspace = new JButton("BackSpace");

      jp_top_west.setLayout(new FlowLayout(FlowLayout.LEFT,0,5));

      jp_top_west.add(jb_Backspace);

      JPanel jp_top_east = new JPanel();

      jp_top_east.setLayout(new FlowLayout(FlowLayout.RIGHT));

      jtf_display = new JTextField();

      jtf_display.setEditable(false);

      jtf_display.setHorizontalAlignment( JTextField.RIGHT );

      //  jtf_display.setFocusable(false);

      jtf_display.setRequestFocusEnabled(false);

      jtf_display.setBackground(Color.white);

      jrb_deg = new JRadioButton("Degrees");

      jrb_rad = new JRadioButton("Radian");

      jrb_deg.setSelected(true);

      jrb_group = new ButtonGroup();

      jrb_group.add(jrb_deg);

      jrb_group.add(jrb_rad);

      jp_top_east.add(jrb_deg);

      jp_top_east.add(jrb_rad);

      jp_top_down.add(jp_top_east,BorderLayout.EAST);

      jp_top_down.add(jp_top_west,BorderLayout.WEST);

      jp_top.setLayout(new BorderLayout());

      JPanel jp_top_top = new JPanel();

      jp_top_top.setLayout(new BorderLayout());

      jl_url = new JLabel("Rajesh's homepage");

      jl_url.setForeground(Color.blue);

      jl_url.addMouseListener(Calc.this);

      jp_top_top.add(new JLabel("This Calculator is created by: tu"),BorderLayout.WEST);

      jp_top_top.add(jl_url,BorderLayout.EAST);

      jp_top.add(jp_top_top,BorderLayout.NORTH);

      jp_top.add(jtf_display,BorderLayout.CENTER);

      jp_top.add(jp_top_down,BorderLayout.SOUTH);

      JPanel jp_center = new JPanel();

      jp_center.setLayout(new GridLayout(5,7,5,5));

      jb_one = new JButton("1");

      jb_two = new JButton("2");

      jb_three = new JButton("3");

      jb_four = new JButton("4");

      jb_five = new JButton("5");

      jb_six  = new JButton("6");

      jb_seven = new JButton("7");

      jb_eight = new JButton("8");

      jb_nine = new JButton("9");

      jb_zero = new JButton("0");

      jb_plus = new JButton("+");

      jb_minus = new JButton("-");

      jb_divide = new JButton("/");

      jb_multiply = new JButton("*");

      jb_sin = new JButton("Sin");

      jb_cos = new JButton("Cos");

      jb_tan = new JButton("Tan");

      jb_asin = new JButton("aSin");

      jb_acos = new JButton("aCos");

      jb_atan = new JButton("aTan");

      jb_pie = new JButton("PI");

      jb_E = new JButton("E");

      jb_decimalpoint = new JButton(".");

      jb_equalto = new JButton("=");

      jb_fact = new JButton("x!");

      jb_power = new JButton("x^n");

      jb_changesign = new JButton("+/-");

      jb_reciporcal = new JButton("1/x");

      jb_todeg = new JButton("toDeg");

      jb_torad = new JButton("toRad");

      jb_round = new JButton("Round");

      jb_CA = new JButton("CA");

      jb_CE = new JButton("CE");

       jb_one.addActionListener(Calc.this);

       jb_two.addActionListener(Calc.this);

       jb_three.addActionListener(Calc.this);

       jb_four.addActionListener(Calc.this);

       jb_five.addActionListener(Calc.this);

       jb_six.addActionListener(Calc.this);

       jb_seven.addActionListener(Calc.this);

       jb_eight.addActionListener(Calc.this);

       jb_nine.addActionListener(Calc.this);

       jb_zero.addActionListener(Calc.this);

       jb_plus.addActionListener(Calc.this);

       jb_minus.addActionListener(Calc.this);

       jb_divide.addActionListener(Calc.this);

       jb_multiply.addActionListener(Calc.this);

       jb_sin.addActionListener(Calc.this);

       jb_cos.addActionListener(Calc.this);

       jb_tan.addActionListener(Calc.this);

       jb_asin.addActionListener(Calc.this);

       jb_acos.addActionListener(Calc.this);

       jb_atan.addActionListener(Calc.this);

       jb_pie.addActionListener(Calc.this);

       jb_E.addActionListener(Calc.this);

       jb_decimalpoint.addActionListener(Calc.this);

       jb_equalto.addActionListener(Calc.this);

       jb_fact.addActionListener(Calc.this);

       jb_power.addActionListener(Calc.this);

       jb_changesign.addActionListener(Calc.this);

       jb_reciporcal.addActionListener(Calc.this);

       jb_todeg.addActionListener(Calc.this);

       jb_torad.addActionListener(Calc.this);

       jb_round.addActionListener(Calc.this);

       jb_CA.addActionListener(Calc.this);

       jb_CE.addActionListener(Calc.this);

       jb_Backspace.addActionListener(Calc.this);

       jp_center.add(jb_one);

       jp_center.add(jb_two);

       jp_center.add(jb_three);

       jp_center.add(jb_multiply);

       jp_center.add(jb_reciporcal);

       jp_center.add(jb_sin);

       jp_center.add(jb_asin);

       jp_center.add(jb_four);

       jp_center.add(jb_five);

       jp_center.add(jb_six);

       jp_center.add(jb_divide);

       jp_center.add(jb_power);

       jp_center.add(jb_cos);

       jp_center.add(jb_acos);

       jp_center.add(jb_seven);

       jp_center.add(jb_eight);

       jp_center.add(jb_nine);

       jp_center.add(jb_plus);

       jp_center.add(jb_changesign);

       jp_center.add(jb_tan);

       jp_center.add(jb_atan);

       jp_center.add(jb_zero);

       jp_center.add(jb_decimalpoint);

       jp_center.add(jb_equalto);

       jp_center.add(jb_minus);

       jp_center.add(jb_fact);

       jp_center.add(jb_pie);

       jp_center.add(jb_E);

       jp_center.add(jb_CA);

       jp_center.add(jb_CE);

       jp_center.add(jb_round);

       jp_center.add(jb_todeg);

       jp_center.add(jb_torad);

       Container cp = this.getContentPane();

       jp_main.add(jp_top,BorderLayout.NORTH);

       jp_main.add(jp_center,BorderLayout.CENTER);

       cp.add(jp_main,BorderLayout.CENTER);

       setSize(520,250);

       /* Packing all Commponent, so spaces are left */

       pack();

       /* Making Window to appear in Center of Screen */

       Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

       Dimension frameSize = this.getPreferredSize();

       setLocation(screenSize.width/2 - (frameSize.width/2),screenSize.height/2 - (frameSize.height/2));

       setVisible(true);

       this.requestFocus();

   }

  public void resetAllButton()

  {

     plusPressed  = false;

     minusPressed = false;

     mulPressed   = false;

     divPressed   = false;

     powerPressed = false;

  }

  public String factorial(double num)

  {

   int theNum = (int)num;

     if (theNum < 1)

     {

       JOptionPane.showMessageDialog(Calc.this,"Cannot find the factorial of numbers less than 1.","Facorial Error",JOptionPane.WARNING_MESSAGE);

         return ("0");

      }

      else

      {

         for (int i=(theNum -1); i > 1; --i)

         theNum *= i;

         return Integer.toString(theNum);

       }

    }

   private void doShowURL(String urlSpec)

   {

       String commandLine;

        if (System.getProperty("os.name").startsWith("Windows"))

        {

            commandLine = "rundll32.exe url.dll,FileProtocolHandler " + urlSpec;

        }

        else

        {

            commandLine = "netscape " + urlSpec;

        }

        try

        {

            Runtime.getRuntime().exec(commandLine);

        }

        catch (IOException ex) {}

    }

   public void actionPerformed(ActionEvent e)

   {

     String s = e.getActionCommand();

     String temptext  = jtf_display.getText();

     boolean decimalPointFound = false;

     double displayNumber = 0;

 

     try

     {

       displayNumber = Double.valueOf(jtf_display.getText()).doubleValue();

     }

    catch(NumberFormatException nfe) {}

    if(equalPressed)

    {

      jtf_display.setText("");

      equalPressed = false;

    }

     if(s.equals("1"))

      jtf_display.setText(jtf_display.getText()+"1");

     if(s.equals("2"))

      jtf_display.setText(jtf_display.getText()+"2");

     if(s.equals("3"))

      jtf_display.setText(jtf_display.getText()+"3");

     if(s.equals("4"))

      jtf_display.setText(jtf_display.getText()+"4");

     if(s.equals("5"))

      jtf_display.setText(jtf_display.getText()+"5");

     if(s.equals("6"))

      jtf_display.setText(jtf_display.getText()+"6");

     if(s.equals("7"))

      jtf_display.setText(jtf_display.getText()+"7");

     if(s.equals("8"))

      jtf_display.setText(jtf_display.getText()+"8");

     if(s.equals("9"))

      jtf_display.setText(jtf_display.getText()+"9");

     if(s.equals("0") && !temptext.equals(""))

      jtf_display.setText(jtf_display.getText()+"0");

     if(s.equals("E"))

      jtf_display.setText(Double.toString(Math.E));

     if(s.equals("PI"))

      jtf_display.setText(Double.toString(Math.PI));

     if(s.equals("toDeg"))

      jtf_display.setText(Double.toString(Math.toDegrees(displayNumber)));

     if(s.equals("toRad"))

      jtf_display.setText(Double.toString(Math.toRadians(displayNumber)));

     if(s.equals("CE"))

      jtf_display.setText("");

     if(s.equals("CA"))

     {

       resetAllButton();

       jtf_display.setText("");

     }

    if(s.equals("."))

    {

        for (int i =0; i < temptext.length(); ++i)

        {

          if(temptext.charAt(i) == '.')

          {

            decimalPointFound = true;

            continue;

          }

        }

         if(!decimalPointFound && temptext.length()==0)

          jtf_display.setText("0.");

         if(!decimalPointFound && temptext.length()!=0)

          jtf_display.setText(jtf_display.getText()+".");

     }

  /**

   * Calulation of sin,cos etc

   */

   if(s.equals("Sin"))

   {

    if(jrb_deg.isSelected())

      jtf_display.setText(Double.toString(Math.sin((displayNumber*Math.PI)/180)));

    else

    {

      jtf_display.setText(Double.toString(Math.sin(displayNumber)));

     // decimalPointpressed

     }

   }

  if(s.equals("Cos"))

   {

    if(jrb_deg.isSelected())

      jtf_display.setText(Double.toString(Math.cos((displayNumber*Math.PI)/180)));

    else

    {

      jtf_display.setText(Double.toString(Math.cos(displayNumber)));

     // decimalPointpressed

     }

   }

if(s.equals("Tan"))

   {

    if(jrb_deg.isSelected())

      jtf_display.setText(Double.toString(Math.tan((displayNumber*Math.PI)/180)));

    else

    {

      jtf_display.setText(Double.toString(Math.tan(displayNumber)));

     // decimalPointpressed

     }

   }

   if(s.equals("aSin"))

   {

    if(jrb_deg.isSelected())

      jtf_display.setText(Double.toString(Math.asin((displayNumber*Math.PI)/180)));

    else

    {

      jtf_display.setText(Double.toString(Math.asin(displayNumber)));

  

     }

   }

if(s.equals("aCos"))

   {

    if(jrb_deg.isSelected())

      jtf_display.setText(Double.toString(Math.acos((displayNumber*Math.PI)/180)));

    else

    {

      jtf_display.setText(Double.toString(Math.acos(displayNumber)));

    

     }

   }

  if(s.equals("aTan"))

   {

    if(jrb_deg.isSelected())

      jtf_display.setText(Double.toString(Math.atan((displayNumber*Math.PI)/180)));

    else

    {

      jtf_display.setText(Double.toString(Math.atan(displayNumber)));

   

     }

   }

  if(s.equals("*"))

  {

   resetAllButton();

   mulPressed = true;

   try

   {

    tempdisplayNum = displayNumber;

   }

   catch(NumberFormatException mule)

    { tempdisplayNum = 0; }

   jtf_display.setText("");

  }

  if(s.equals("+"))

  {

   resetAllButton();

   plusPressed = true;

   try

   {

   tempdisplayNum = displayNumber;

   }

   catch(NumberFormatException pluse)

    { tempdisplayNum = 0; }

   jtf_display.setText("");

  }

  if(s.equals("-"))

  {

   resetAllButton();

   minusPressed = true;

   try

   {

   tempdisplayNum = displayNumber;

   }

   catch(NumberFormatException sube)

    { tempdisplayNum = 0; }

   jtf_display.setText("");

  }

  if(s.equals("/"))

  {

   resetAllButton();

   divPressed = true;

   try

   {

   tempdisplayNum = displayNumber;

   }

   catch(NumberFormatException dive)

    { tempdisplayNum = 0; }

   jtf_display.setText("");

  }

  if(s.equals("x^n"))

  {

   powerPressed = true;

   try

   {

   tempdisplayNum = displayNumber;

   }

   catch(NumberFormatException dive)

    { tempdisplayNum = 0; }

   jtf_display.setText("");

  }

  if(s.equals("="))

  {

    if(mulPressed)

    jtf_display.setText(Double.toString(tempdisplayNum*displayNumber));

    if(plusPressed)

    jtf_display.setText(Double.toString(tempdisplayNum+displayNumber));

    if(minusPressed)

    jtf_display.setText(Double.toString(tempdisplayNum-displayNumber));

    if(divPressed)

    jtf_display.setText(Double.toString(tempdisplayNum/displayNumber));

    if(powerPressed)

    jtf_display.setText(Double.toString(Math.pow(tempdisplayNum,displayNumber)));

    resetAllButton();

    equalPressed = true;

   }

  if(s.equals("1/x"))

  jtf_display.setText(Double.toString(1/displayNumber));

  if(s.equals("+/-") && displayNumber!=0)

  jtf_display.setText(Double.toString(-displayNumber));

  if(s.equals("x!"))

  jtf_display.setText(factorial(displayNumber));

  if(s.equals("Round"))

  jtf_display.setText(Double.toString(Math.round(displayNumber)));

  if(s.equals("BackSpace"))

  {

  String temptextt = jtf_display.getText();

  if(!temptextt.equals(""))

  jtf_display.setText(temptextt.substring(0, temptextt.length() - 1));

  }

 }

  public void mouseClicked(MouseEvent me)

  {

                        doShowURL("http://programacionparajava.blogspot.com");

  }

  public void mouseEntered(MouseEvent me)

  {

                          jl_url.setForeground(Color.red);

                          setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));

  }

  public void mouseExited(MouseEvent me)

  {

                          jl_url.setForeground(Color.blue);

                          setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));

  }

  public void mouseReleased(MouseEvent me) {}

  public void mousePressed(MouseEvent me) {}

  public static void main(String args[])

   {

 

                         try

                         {

                           UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

                       }

                       catch(Exception e)

                       {}

     new Calc();

   }

}