统计int类型-字节中1的个数

public class BytesToInt {
    public static int count1(int value){
        int count = 0;
        for (int i = 0; i < 32; i++){
            if ((value & 0x01) == 0x01){
                count++;
            }
            value = value >> 1;
        }
        return count;
    }

    public static void main(String[] args) {
        System.out.println(count1(0xff));   // 8
    }
}

参考博客： http://www.cnblogs.com/xiangxiaodong/archive/2012/10/20/2732666.html