find the given input is integer or string

class CheckValue 
{
    public boolean checkIfNumber(String in) {

        try {

            Integer.parseInt(in);

        } catch (NumberFormatException ex) {
            return false;
        }

        return true;
    }
    public static void main(String[] args) 
    {
        String str="22222";
        CheckValue v=new CheckValue();
        boolean value=v.checkIfNumber(str);
        if(value){
            System.out.println("Value is integer!");
        }
        else{
            System.out.println("Value is not integer!");
        }

    }
}