LeetCode 344. Reverse String

Topic description

• LeetCode 344. Reverse String
• Please write a function whose function is to reverse the input string.

Example

• Input: s = "hello"
  
• returns: "olleh"

Code

• Java

  class Solution {
      public String reverseString(String s) {
          if (s == null || s.length() <= 1) {
              return s;
          }
          char[] arr = s.toCharArray();
          int length = arr.length;
          for (int i = 0; i < length / 2; i++) {
              char temp = arr[i];
              arr[i] = arr[length - i - 1];
              arr[length - i - 1] = temp;
          }
          return String.valueOf(arr);
  
          //return new StringBuilder(s).reverse().toString();
      }
  }