CalculatorCoding -1:import javax.microedition.midlet.*;import javax.microedition.lcdui.*;

public class CalcMidlet extends MIDlet implements CommandListener{ private Display display;private Form frm;private TextField txtfld1=new TextField("Number 1","",20,TextField.ANY);private TextField txtfld2=new TextField("Number 2","",20,TextField.ANY);private TextField txtfld3=new TextField("Result","",20,TextField.ANY);Command calculate=new Command("calculate",Command.SCREEN,1);Command exit= new Command("Exit",Command.EXIT,0);String menuArr[]={"+","-","*","/","%"};private ChoiceGroup radioChoice=new ChoiceGroup("Select",Choice.EXCLUSIVE,menuArr,null);

public void startApp(){frm=new Form("Calculator");frm.append(txtfld1);frm.append(txtfld2);frm.append(txtfld3);frm.append(radioChoice);frm.addCommand(calculate);frm.addCommand(exit);frm.setCommandListener(this);Display.getDisplay(this).setCurrent(frm);}

public void pauseApp(){}public void destroyApp(boolean unConditional){}public void commandAction(Command cmd, Displayable displayable){ if(cmd==exit) {destroyApp(false);notifyDestroyed();}else if(cmd==calculate){ int i1,i2,res=0; try {i1=Integer.parseInt(txtfld1.getString());i2=Integer.parseInt(txtfld2.getString());switch(radioChoice.getSelectedIndex()){case 0:{res=i1+i2;break; }case 1:{res=i1-i2;break;}case 2:{res=i1*i2;break;}case 3:{res=i1/i2;break;}case 4:{res=i1%i2;break;}default:break;}}catch(Exception e){System.out.println("Exception is caught"+e);e.printStackTrace();}txtfld3.setString(Integer.toString(res));} }}

Output:

Calculator Coding -2:

import javax.microedition.midlet.*;import javax.microedition.lcdui.*;

public class Calculator extends MIDlet implements CommandListener {

private Display display; // The display for this MIDlet private Form form; private TextField a,b,c; private Command add,sub,mul,exit; private Alert alert; public Calculator() { a = new TextField("n1:", "", 30, TextField.ANY); b = new TextField("n2:", "", 30, TextField.ANY); add = new Command("Add", Command.OK, 1); sub = new Command("Sub", Command.OK, 2); mul = new Command("Mul", Command.OK, 3); exit= new Command("Exit", Command.EXIT, 0); display = Display.getDisplay(this); }

public void startApp() { form = new Form("Calculator");form.append(a); form.append(b); form.addCommand(add);form.setCommandListener(this);

form.addCommand(sub);form.setCommandListener(this);

form.addCommand(mul);form.setCommandListener(this);

form.addCommand(exit); form.setCommandListener(this);

display.setCurrent(form);

}

public void pauseApp() { }

public void destroyApp(boolean unconditional) { }

public void commandAction(Command c, Displayable s) { String n1 = a.getString();String n2 = b.getString(); if (c == add) { display = Display.getDisplay(this);int res=Integer.parseInt(n1)+Integer.parseInt(n2);

alert=new Alert("result",res+"",null,AlertType.INFO); alert.setTimeout(Alert.FOREVER); display.setCurrent(alert,form); } if (c == sub) { display = Display.getDisplay(this);int res=Integer.parseInt(n1)-Integer.parseInt(n2);

alert=new Alert("result",res+"",null,AlertType.INFO); alert.setTimeout(Alert.FOREVER); display.setCurrent(alert,form); } if (c == mul) { display = Display.getDisplay(this);int res=Integer.parseInt(n1)*Integer.parseInt(n2);alert=new Alert("result",res+"",null,AlertType.INFO); alert.setTimeout(Alert.FOREVER); display.setCurrent(alert,form); } if(c==exit) { destroyApp(false); notifyDestroyed();

} }

}