*Happy Number

Write an algorithm to determine if a number is "happy".
A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers.
Example: 19 is a happy number

• 1² + 9² = 82
• 8² + 2² = 68
• 6² + 8² = 100
• 1² + 0² + 0² = 1

public class Solution {
    private int getNextHappy(int n) {
        int sum = 0;
        while (n != 0) {
            sum += (n % 10) * (n % 10);
            n /= 10;
        }
        return sum;
    }
    
    public boolean isHappy(int n) {
        HashSet<Integer> hash = new HashSet<Integer>();
        while (n != 1) {
            if (hash.contains(n)) {
                return false;
            }
            hash.add(n);
            n = getNextHappy(n);
        }
        return true;
    }
}