Create Object in if-statement and use it later

Question

I am writing a Parser for Infix Notation. In the if-statement I declare the variable newchild. Otherwise I want it to throw an exception. But when I am out of the scope the Comp

Answer 1

you can do:

int value = = -1;
Leaf res = null;
if(Character.isDigit(tokenList.get(i).charAt(1))){
      value =Integer.parseInt(tokenList.get(i));                
      res = new Leaf(value);
 }

and check out of the if what values are stored in the variables value and res