timerj2me.java

package hello;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*; 
import java.io.*;

public class kkk extends MIDlet implements CommandListener
{
 private Form form;
 private Display display;
 private TextField input1, input2;
 private Command add, sub, mul,div,start_timer,stop_timer;
 private StringItem item,timer_item;
 private long start_time; 
 private long stop_time;
 
 public void startApp()
 {
  display = Display.getDisplay(this);
  Form form = new Form("Calculator");
  form.append("Welcome to scientific calculator ");
  item = new StringItem("Result", "");
  timer_item = new StringItem("Timer" , "");
  
  

  input1 = new TextField("First Number:", "", 30, TextField.NUMERIC);
  input2 = new TextField("Second Number", "", 30, TextField.NUMERIC);
  form.append(input1);
  form.append(input2);
  add = new Command("Addition", Command.OK, 1);
  sub = new Command("Subtraction", Command.OK, 1);
  mul = new Command("Multiplication", Command.OK, 1);
  div = new Command("Division", Command.OK, 1);
  start_timer = new Command("StartTime",Command.OK,1);
  stop_timer = new Command("StopTime",Command.OK,1);
  
  form.addCommand(add);
  form.addCommand(sub);
  form.addCommand(mul);
  form.addCommand(div);
  form.addCommand(start_timer);
  form.addCommand(stop_timer);
  form.append(item);
  form.append(timer_item);
  

  form.setCommandListener(this);
  
  display.setCurrent(form);
 }

 public void pauseApp() { }

 public void destroyApp(boolean uncondn)
 {
  notifyDestroyed();
 }
 
    private void calculate()
  {
    int one=Integer.parseInt(input1.getString());
    int two= Integer.parseInt(input2.getString());
    int result=one+two;
    item.setText( result + "" );

  }
    private void startTimer()
    {
    	start_time = System.currentTimeMillis();
    	
    	timer_item.setText("Timer started" + System.currentTimeMillis() );
    }
    
    private void stopTimer()
    {
    	stop_time = System.currentTimeMillis();
    	timer_item.setText("Timer stopped " + (stop_time- start_time )/1000);
    }
 
    private void calculate1()
 {
  int one = Integer.parseInt(input1.getString());
  int two = Integer.parseInt(input2.getString());
  int result = one - two;
  item.setText(result + "");

 }
 private void calculate2()
 {
  int one = Integer.parseInt(input1.getString());
  int two = Integer.parseInt(input2.getString());
  int result = one * two;
  item.setText(result + "");

 }
 private void calculate3()
 {
  int one = Integer.parseInt(input1.getString());
  int two = Integer.parseInt(input2.getString());
  int result = one / two;
  item.setText(result + "");

 }
 public void commandAction(Command c, Displayable d)
 {
  String label = c.getLabel();
  if (label.equals("Addition"))
  {
   calculate();
   
  }
  
  else if (label.equals("Subtraction"))
  {
   calculate1();
   
  } 
  
  else if (label.equals("Multiplication"))
  {
   calculate2();
   form.append("The Answer is:");
  }
  
  else if (label.equals("Division"))
  {
   calculate3();
   form.append("The Answer is:");
  }
  else if(label.equals("StartTime"))
  {
	  startTimer();
  }
  else if(label.equals("StopTime"))
  {
	  stopTimer();
  }
  
  
 }
}