Integer.bitCount
counts the number of one-bits in the two's complement binary representation of the specified int value. Example code: public class CountOnes { public static void main(String[] args) { int[] i = { 1, 4, 7, 15 }; for (int j = 0; j < i.length; j++) { System.out.printf("Number of 1's in %d: %d\n", i[j], Integer.bitCount(i[j])); } } }
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