如何有效二进制字符串转换为二进制字节数组在Java中？ [英] How to convert efficiently binary string to binary byte array in Java?

问题描述

作为输入我有二进制串字符串A =100110。作为输出我需要的二进制字节数组字节[] B = {1,0,0,1,1,0} 。
现在我使用

As an input I have binary string String a = "100110". As output I need to have binary byte array byte[] b = {1,0,0,1,1,0}. For now I'm using

的for（int i = 0; I＆LT;则为a.length;我++）{
   B〔Ⅰ〕=的Byte.parseByte（a.substring（I，I + 1））;
}

但是，这种方法是太慢了。任何人能给出更好的建议？谢谢

But this approach is too slow. Can any one give a better suggestion? Thank you

推荐答案

您可以不用使物体为子，像这样的：

You can do it without making objects for substrings, like this:

for (int i=0; i<a.length; i++) {
    b[i]= a.charAt(i)=='1' ? (byte)1 : (byte)0;
}

原因你的做法是比较慢的是，每次调用串产生一个新的字符串对象，有资格垃圾收集尽快 parseByte 与它完成。

The reason your approach is slower is that each call to substring produces a new String object, which becomes eligible for garbage collection as soon as parseByte is done with it.

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