How to increment the string value?

Question

For example:

 public static void main(String[] args)
{
String a="1";
int inc= Integer.parseInt(a+1);
System.out.println(inc);

 }

I'm getting 11 but i want to get 2. How can i do it in a very efficient way?

Answer 1

Integer.parseInt(a+1); parses the String that results from concatenating the value of the String a ("1") to the int literal 1, which is "11".

Change it to

int inc = Integer.parseInt(a) + 1;

This way "a" would be parsed to the integer 1 and then 1 would be added to it to give you the value 2.

Answer 2

Since a is a String object this operation is not giving the desired input

Integer.parseInt(a+1);

because will be equivalent to do

Integer.parseInt("1"+"1");

or

Integer.parseInt("11");

you need to parse the string first and then increment

 Integer.parseInt(a)+1