[Solved] Reverse The Words In A Sentence But Not The Letters [duplicate]

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class Solution {
     public String reverseWords(String s) {
        if (s == null || s.length() == 0) {
            return "";
         }

    // split to words by space
    String[] arr = s.split(" ");
    StringBuilder sb = new StringBuilder();
    for (int i = arr.length - 1; i >= 0; --i) {
        if (!arr[i].equals("")) {
            sb.append(arr[i]).append(" ");
        }
    }
    return sb.length() == 0 ? "" : sb.substring(0, sb.length() - 1);
  }
}

solved Reverse The Words In A Sentence But Not The Letters [duplicate]