Solution using Binary String

  • 0

    class Solution {
    public boolean isPowerOfTwo(int n) {

        String binaryRep = null;
        binaryRep = Integer.toBinaryString(n);
        boolean result = false;
        int bitCount = 0;
        if (n > 0){
            for (char c : binaryRep.toCharArray()){
                if (c == '1'){
            if(bitCount == 1){
                result = true;
        return result;


    If the input is negative, that number will never be the power of two. So the result must be false.
    And for non-negative numbers, we first convert the number into a binary string, and if there is more than one '1' in that string, the result should be false.
    For other cases, the result should be true.

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