cheking on symmetric number

Question

How check number on symmetrics?

public static int Symmetric(int a) {
    if(new StringBuilder(Integer.toString(a)) ==
        new StringBuilder(Integer.toString(a)).reverse())
        return  a;
    else
        return 0;
}

I try do it smth like this but always return 0.

Answer 1

You can't use == to compare Strings (or StringBuilders), you need to use equals().
Also, you need to turn the StringBuilders back to Strings before comparing:

EDIT: Also, there is really no need for the first StringBuilder:

public static int symmetric(int a) {
    if (Integer.toString(a).equals(new StringBuilder(Integer.toString(a)).reverse().toString()))
        return a;
    else
        return 0;
}