کد ماشین حساب به زبان جـاوا

کد ماشین حساب به زبان جـاوا

Calculator In Java

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class CalculatorApplet extends Applet implements ActionListener
{
private Button keysArray[];
private Panel keyPad;
private TextField lcdField;
private double result;
private boolean first;
private boolean foundKey;
static boolean clearText;
private int prevOperator;

public void init()
{
lcdField = new TextField(20);
keyPad = new Panel ();
keysArray = new Button[17];
result = 0.0;
prevOperator = 0;
first = true;
clearText = true;

//Set frame layout manager setLayout(new BorderLayout());

lcdField.setEditable(false);

//Create buttons
for (int i = 0; i <=9; i++)
   keysArray[i] = new Button(String.valueOf(i));
   keysArray[10] = new Button("/");
   keysArray[11] = new Button("*");
   keysArray[12] = new Button("-");
   keysArray[13] = new Button("+");
   keysArray[14] = new Button("=");
   keysArray[15] = new Button(".");
   keysArray[16] = new Button("CLR");

//Set panel layout manager
keyPad.setLayout(new GridLayout (4,4));

   //Add button to keyPad panel
   for (int i = 7; i <=10; i++) //adds Button 7,8,9, and divide to
Panel
    keyPad.add(keysArray[i]);

for (int i = 4; i <6; i++) //adds buttons 4,5,6 to Panel
keyPad.add(keysArray[i]);

keyPad.add(keysArray[11]); //adds multiply button to Panel

for (int i = 1; i <= 3;i++) //adds buttons 1,2 and 3 to Panel
keyPad.add(keysArray[i]);

keyPad.add(keysArray[12]);//adds minus button to Panel

keyPad.add(keysArray[0]); //adds 0 key to Panel

for (int i = 15; i >=13; i--)
keyPad.add(keysArray[i]); //adds decimal point, equal, and addition
ke
ys Panel

    add(lcdField, BorderLayout.NORTH); //adds text field to top of
Frame
    add(keyPad, BorderLayout.CENTER); //adds Panel to center of Frame
    add(keysArray[16], BorderLayout.EAST); //adds Clear key to right
side
of applet

for(int i = 0; i < keysArray.length; i++)
keysArray[i].addActionListener(this);
}

public void actionPerformed(ActionEvent e)
{
foundKey = false;

   //Search for the key pressed
   for (int i = 0; i < keysArray.length && !foundKey; i++)
   if(e.getSource() == keysArray[i]) //key match found
   {
     foundKey = true;
     switch(i)
     {
     case 0: case 1: case 2: case 3: case 4: //number buttons
     case 5: case 6: case 7: case 8: case 9: //0-9
     case 15:
     if (clearText)
     {
     lcdField.setText("");
     clearText = false;
  }
  lcdField.setText(lcdField.getText() +
  keysArray[i].getLabel());
  break;

  case 10:// divide button
  case 11:// multiply button
  case 12:// minus button
  case 13:// plus button
  case 14:// equal button
    clearText = true;
    if (first) // First operand
    {
    if(lcdField.getText().length()==0)
     result = 0.0;
    else
     result = Double.valueOf(lcdField.getText()).doubleValue();

  first = false;
                prevOperator = i; //save previous operator
     }
       else //second operand already enter, so calculator total
       {
   switch(prevOperator)
   {
   case 10: //divide Button
    result /= Double.valueOf(lcdField.getText()).
    doubleValue();
  break;
  case 11: //multiply Button
  result *= Double.valueOf(lcdField.getText()).
  doubleValue();
  break;
  case 12: //minus button
  result -= Double.valueOf(lcdField.getText()).
  doubleValue();
  break;
  case 13: //plus button
  result += Double.valueOf(lcdField.getText()).
  doubleValue();
  break;
    }
    lcdField.setText(Double.toString(result));
    if (i==14)//equal button
     first = true;
    else
     prevOperator = i; //save previous opetator
     }
     break;

     case 16://Clear button
     clearText = true;
     first = true;
     lcdField.setText("");
     result = 0.0;
     prevOperator = 0;
     break;
     }
     }
    }
   }

کد ماشین حساب به زبان جـاوا

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کد ماشین حساب به زبان جـاوا

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