Java:用于标志检查的按位操作 [英] Java: Bitwise operation for flag checking

问题描述

我正在尝试检查数字是否具有第二位标志(即0000 0010).我的代码如下:

I'm trying to check whether or not a number has the second bit flag (ie 0000 0010). My code is as follows:

int flags = Integer.parseInt(fields[1]);
String strflags = Integer.toBinaryString(flags);
flags = Integer.parseInt(strflags);
int secondBitTest = Integer.parseInt("00000010", 2);
if((flags & secondBitTest) == 2) {
    System.out.println("YES");
}

但是我认为我可能做错了，因为当我尝试输入147时，什么也不会返回.

However I think I might be doing this wrong, since when I try to input 147 nothing is returned.

推荐答案

您可以使用我发现的 x是您要检查的数字，n是您要检查的比特.该算法的工作原理是将数字1左移n，然后与x进行与"运算.

x is the number you wish to check, and n is the bit you want to check. The algorithm works by left-shifting the number 1 by n, and AND-ing it with x.

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