How to merge two strings into another variable

Question

The following is the situation:

I have three String parameters a1,a2,a3

Each of the parameter has a different number inside

a1: 12

a2: 34

a3: 56

So using a for -loop i want to insert these number into a method

items = the amount of parameters so in this case 3

 for (int i=1;i<=items;i++){
    popupCmplx_RPM(a+i);
    sleep(2);
    }

So the problem is if I run the functionality it will create for the String a1: a+i -> 121 instead of 12

The parameters are already set I can't change that part of the code so help is appreciated. I sure there is an easier way without the parameters, but other that adding new code I can't remove those

The total amount of parameters set at the moment are 16 some of which can be 0 so in this example there are only three and the rest are zero. with the int items variable the amount of parameters used is given

Answer 1

It looks like you're looping and trying to use the index of the loop to reference a variable. You cannot do that (without reflection) in Java.

^{(If that's an incorrect interpretation of your question, please update it to clarify.)}

You probably have a couple options:

1. Just reference the variables without looping:

   popupCmplx_RPM(a1);
   sleep(2);
   popupCmplx_RPM(a2);
   sleep(2);
   popupCmplx_RPM(a3);
   sleep(2);
   

2. Store the values in a collection instead of individual variables:

   List<Integer> list = new ArrayList<Integer>();
   list.add(12);
   list.add(34);
   list.add(56);
   
   for(Integer value : list) {
       popupCmplx_RPM(value);
       sleep(2);
   }
   

Answer 2

You have to parse the String as an int, and then add one to it, like

int myInt = Integer.parseInt(a) + 1;
popupCmplx_RPM(myInt);

Careful, this can throw NumberFormatException if a isn't a valid integer.