Standard Java. Long.

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public String reverseWords(String s) {
    String[] strs = s.split(" ");
    StringBuilder sb = new StringBuilder();
    String space = " ";
    for (String str : strs) {
        sb.append(reverse(str));
        sb.append(space);
    }
    return sb.toString().trim();
}
String reverse(String str) {
    char[] arr = str.toCharArray();
    int s = 0, e = str.length() - 1;
    while (s < e) {
        char tmp = arr[s];
        arr[s] = arr[e];
        arr[e] = tmp;
        s++;
        e--;
    }
    return new String(arr);
}

Ruby:

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def reverse_words(s)
    s.split().map(&:reverse).join(' ')
end

The reverse String method above: standard.

Python:

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return ' '.join(x[::-1] for x in s.split())

Or : reverse the order of words, then reverse the entire string.

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return ' '.join(s.split()[::-1])[::-1]