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public class NumberOf1Bit {

public int hammingWeight(int n) {

if (n==0) return 0;

int count = 0;

//revert first bit if it's 1 to make the number positive

int pos_n = (n>0) ? n : n^(1<<31);

for(int i=1 ; i > 0 && i <= pos_n ; i = i << 1) {

if ((i ^ n) < n) {

count++;

}

}

return count + (n > 0 ? 0 : 1);

}

}