Java-将字符串(4个字符)转换为int并返回的乐趣 [英] Java - fun converting a string (4 chars) to int and back

问题描述

请不要问为什么，但是我必须将一个字符串(最多4个字符)存储在一个整数值(即4个字节)中.

Please don't ask why but I have to store a string (max 4 char) in an integer value (so 4 bytes).

首先，我写了这个，它起作用了:

First I wrote this and it works:

String value = "AAA";
int sum = IntStream.range(0, value.length())
                   .limit(4)
                   .map(i -> value.charAt(i) << (i * 8))
                   .sum();

System.out.println(sum);

我无法想出可行的解决方案.

I was unable to think a functional solution for the way back.

StringBuffer out = new StringBuffer();
while (sum > 0) {
    int ch = sum & 0xff;
    sum >>= 8;
    out.append((char) ch);
}

有任何想法以实用的方式写回"AAA"的方法吗?

Any idea to write the way back (to "AAA") in a functional way?

推荐答案

与您的非常相似，但可能会有所帮助

That's pretty similar to yours, but maybe will be helpful

    String str = IntStream.iterate(sum, s -> s > 0, s -> s >> 8)
            .mapToObj(s -> String.valueOf((char)(s & 0xff)))
            .collect(Collectors.joining());

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