反转字符串而不更改Java中的空格

Question

I'm working on reversing the string word by word and making sure that all the spaces, tabs and white spaces character etc. are not changed or removed. I have tried few solution using Java, but ending up with no good result. For example , to convert following string

 The rule       about++[]      the     input

        stream.

And get output like this without removing any white space character.

 ehT elur       tuoba++[]      eht     tupni

        maerts.

My code

String reverseString(String str) {
    StringBuilder temp = new StringBuilder();
    StringBuilder result = new StringBuilder();
    for (char ch : str.toCharArray()) {
        if (Character.isAlphabetic(ch)) {
            temp.append(ch);
        } else {
            result.append(temp.reverse()).append(ch);
            temp.delete(0, temp.length());
        }
    }
    result.append(temp);
    return result.toString();
}

I getting same result with one issue that word about++[] , should be ][++tuoba0 where as it is showing like this tuoba++[] . Any way to resolve this issue?

Answer 1

+ and [] are not alphabetical, so you are treating them the same way you treat whitespace. Character.isWhitespace can help you solve your problem.

Answer 2

Try changing

if (Character.isAlphabetic(ch)) {

to

if (!Character.isWhitespace(ch)) {

This way you will include all characters that are not whitespaces. Otherwise you will reverse only alphabetic characters which [ ] + are not.