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Write a function that takes an unsigned integer and returns the number of ’1‘ bits it has (also known as the Hamming weight).

For example, the 32-bit integer ’11‘ has binary representation 00000000000000000000000000001011, so the function should return 3.

题目解析：输出一个数字二进制中1的个数

解法解析：有个小技巧而已 n&（n-1）每次都能消灭一个1，比较简单，直接上AC代码

public int hammingWeight(int n) {
		if(n==0)
			return 0;
		int count = 0;
		while(n!=0){
			n = n&(n-1);
			count++;
		}
		return count;
	}

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原文：http://blog.csdn.net/xsf50717/article/details/47374939