j2me calculater example in netbeans IDE by R4R Team

package hello;

import javax.microedition.lcdui.*;

import javax.microedition.midlet.*;

* @alok sharma

public class Calc1 extends MIDlet implements CommandListener

{

TextField inp;

Display display;

Command add,OK,Exit,sub,div,mul,History;

int result;

Ticker tk;

public Calc1()

{

tk=new Ticker("Start");

History=new Command("History", Command.OK, 6);

inp = new TextField("Input", "", 10, TextField.NUMERIC);

add = new Command("ADD", Command.OK, 1);

div=new Command("Divide", Command.OK, 3);

mul=new Command("Multiply", Command.OK, 5);

sub=new Command("Subtract", Command.OK, 2);

OK = new Command("OK", Command.STOP, 4);

Exit=new Command("EXIT", Command.EXIT, 7);

}

public void startApp()

{

display =Display.getDisplay(this);

Form f1=new Form("CALCULATOR BY ALOK SHARMA");

f1.setTicker(tk);

f1.append(inp);

f1.addCommand(History);

f1.addCommand(add);

f1.addCommand(OK);

f1.addCommand(Exit);

f1.addCommand(sub);

f1.addCommand(div);

f1.addCommand(mul);

f1.setCommandListener(this);

display.setCurrent(f1);

}

public void pauseApp() {

}

public void destroyApp(boolean unconditional)

{

notifyDestroyed();

}

int kpress=0;

void ad()

{

kpress=0;

if(inp.size()!=0)

{

tk.setString(tk.getString()+"+"+inp.getString());

String input=inp.getString();

result+=Integer.parseInt(input);

}

}

void sb()

{

kpress=1;

if(inp.size()!=0)

{

tk.setString(tk.getString()+"-"+inp.getString());

String input=inp.getString();

if(result==0)

result=Integer.parseInt(input);

result-=Integer.parseInt(input);

}

}

void ml()

{

kpress=2;

if(inp.size()!=0)

{

tk.setString(tk.getString()+"x"+inp.getString());

String input=inp.getString();

if(result==0)

result=Integer.parseInt(input);

result*=Integer.parseInt(input);

}

}

void dv()

{

kpress=3;

if(inp.size()!=0)

{

tk.setString(tk.getString()+"/"+inp.getString());

String input=inp.getString();

if(result==0)

result=Integer.parseInt(input);

result/=Integer.parseInt(input);

}

}

catch(Exception ex)

{

result=0;

}

}

public void commandAction(Command c,Displayable d)

{

if(c==add)

ad();

if(c==sub)

sb();

if(c==mul)

ml();

if(c==div)

dv();

if(c==History)

{

Alert nalt=new Alert("History",tk.getString(),null,AlertType.INFO);

nalt.setTimeout(Alert.FOREVER);

display.setCurrent(nalt);

}

if(c==OK)

{

if(kpress==0)

ad();

else if(kpress==1)

sb();

else if(kpress==2)

ml();

else if(kpress==3)

dv();

else{}

}

catch(Exception ex)

{}

tk.setString(tk.getString()+"="+result);

Alert res=new Alert("Result","RESULT = "+result, null, AlertType.INFO);

res.setTimeout(5000);

display.setCurrent(res);

}

}

if(c==Exit)

destroyApp(true);

inp.setString("");

}

}