Increment/Decrement operators

The increment/decrement operators can be applied before (prefix) or after (postfix) the operand.
The code result++; and ++result; will both end in result being incremented by one.
The only difference is thatthe prefix version (++result) evaluates to the incremented value,
whereas the postfix version (result++) evaluates to the original value.
If you are just performing a simple increment/decrement, it doesn't really matter which version you choose.
But if you use this operator in part of a larger expression, the one that you choose may make a significant difference.

The following program, PrePostDemo, illustrates the prefix/postfix unary increment operator:

class PrePostDemo {
     public static void main(String[] args){
            int i = 3;
	  i++;
  	  System.out.println(i);	// "4"
	  ++i;			   
  	  System.out.println(i);	// "5"
	  System.out.println(++i);	// "6"
  	  System.out.println(i++);	// "6"
	  System.out.println(i);	// "7"
       }
}

Reference
  

1. Java Language Basic