Interview Question for Software Engineer at Google:

package asaf;

public class ReverseWordsInString {
    public static void main(String[] args) {
        System.out.println(reverse("Reverse all the words in a string"));
    }

    private static String reverse(String s) {
        String result = "";
        String space = "";
        for (String word : s.split(" ")) {
            result = word + space + result;
            space = " ";
        }
        return result;
    }
}

This post has been removed. Please see our Community Guidelines or Terms of Service for more information.

This is another version that will reverse each word in place

package asaf;

public class ReverseWordsInString {
    public static void main(String[] args) {
        System.out.println(reverse(new StringBuffer("Reverse all the words in a string!")));
    }

    private static StringBuffer reverse(StringBuffer s) {
        int fromIndex = 0;
        int toIndex;
        boolean reachTheEnd = false;
        do {
            toIndex = s.indexOf(" ", fromIndex);
            if (toIndex == -1) {
                reachTheEnd = true;
                toIndex=s.length();
            }
            reverseWord(s, fromIndex, toIndex-1);
            fromIndex = toIndex + 1;
        } while (!reachTheEnd);
        return s;
    }

    private static void reverseWord(StringBuffer s, int start, int end) {
        while (start < end) {
            char temp = s.charAt(start);
            s.setCharAt(start++, s.charAt(end));
            s.setCharAt(end--, temp);
        }
    }
}

// will print "esreveR lla eht sdrow ni a !gnirts"

public class hello {

    public static void main( String[] args) {

        //reverse all words in a string

        String reverseString =null;
        StringBuffer reverseWord = null;

        String string = "my name is hello";
        String[] newstring = string.split(" ");
        int i, j;
        int wordLength = 0;
        StringBuffer sb = new StringBuffer();

        for (i = 0; i<newstring.length; i++){

            wordLength = newstring[i].length();
            for (j = wordLength;j>0;j--){
                char character= newstring[i].charAt(j-1);
                 reverseWord =sb.append(character);

            }
            reverseWord = reverseWord.append(" ");
            reverseString = reverseWord.toString();

        }
        System.out.print(reverseString);

        }

}