342. Power of Four Java solutions

Given an integer (signed 32 bits), write a function to check whether it is a power of 4.

Example:
Given num = 16, return true. Given num = 5, return false.

Follow up: Could you solve it without loops/recursion?

Credits:
Special thanks to @yukuairoy for adding this problem and creating all test cases.

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public class Solution {
    public boolean isPowerOfFour(int num) {
        if(num == 1) return true;
        if(num < 4) return false;
        while(num%4 == 0){
            num = num >> 2;
        }
        if(num == 1) return true;
        return false;
    }
}