Doubt in keyPressed() function!

Question

Hi to all,
Im doing project in J2ME. In my source code, i used keyPressed() function to get the user's choice by using switch case.Now my doubt is, should i use one more keyPressed() function in inside my previous keyPressed() func.(i.e. nested keypressed() func)?.. For eg: In my application, there will be four choices.. 1.Cars 2. Bikes 3.Mobiles 4.exit...If an user press the key '3' means, i need to giv him one more choice screen like 1.Nokia 2.Sony ericsson 3.Motorola.. If an user press '2' means, have to display the info about sony ericsson...Right now im using code like the following:
public void keyPressed(int key)
switch(key)
case KEY_NUM1:
break;
case KEY_NUM2:
break;
case KEY_NUM3:
break;
case KEY_NUM4:
break;
Now my doubt is....Should i use like the following:
public void keyPressed(int key)
switch(key)
case KEY_NUM1:
break;
case KEY_NUM2:
break;
case KEY_NUM3:
public void keyPressed(int key)
switch(key)
case KEY_NUM1:
break;
case KEY_NUM2:
break;
case KEY_NUM3:
break;
case KEY_NUM4:
break;
break;
case KEY_NUM4:
break;
}

Answer 1

My doubt is how to write code to insert data to table. I have written code like this.
try{
         String str1= wdContext.currentTestElement().getCode();
          String str2= wdContext.currentTestElement().getDesc();
          boolean str3= wdContext.currentTestElement().getAct();
          String str4= wdContext.currentTestElement().getOpt();
          String str5;
          if(str3)
          str5=new String("x");
          else
          str5=new String(" ");
          Zup_Desig12_Input input=new Zup_Desig12_Input();
          input.setDesg_Code(str1);
          input.setDesg_Desc(str2);
          input.setDesg_Act(str5);
          input.setDesg_Opt(str4);
          wdContext.nodeZup_Desig12_Input().bind(input);
          wdContext.currentZup_Desig12_InputElement().modelObject().execute();
    }catch(Exception e)
         wdComponentAPI.getMessageManager().reportSuccess(e.toString());
But i am getting      java.lang.ArrayIndexOutOfBoundsException: -1
in line
input.setDesg_Act(str5);
can any one help me plz