Calling a variable by name, which isn't known while compiling

Question

Is it possible to set a variable, if i want to have it flexible? I think an exmaple makes it easier to understand.

String hallo1;
String hallo2;

for(int i = 0; i < 2; i++) {
 hallo & i = Integer.toString(i);
}

Answer 1

No, you cannot. There's (fortunately) no such thing as eval() in Java.

Your best bet is to grab an Array or an ArrayList. Here's an Array example:

String[] hallos = new String[2];

for (int i = 0; i < 2; i++) {
    hallos[i] = Integer.toString(i);
}

Answer 2

It's technically possible with reflection, but I would advise against it unless you have a really good reason to do it. It would make your code much more difficult to debug and to read.

EDIT:
As the comments stressed:

1. To clarify, I strongly suggest not to be tempted to use reflection. The other answers point out better ways to achieve your goal, such as an array.
2. Reflection won't help you with local variables.