str.reverse java code example

Example 1: reverse string java

// Use StringBuilder for non-thread environment, it is faster
String string="whatever";
String reverse = new StringBuilder(string).reverse().toString();
System.out.println(reverse);

Example 2: string reverse in java

String str = "Hello";
String reverse(String str){
  StringBuilder sb = new StringBuilder();
  sb.append(str);
  sb.reverse();
  return sb.toString();
}

Example 3: Reverse a string in java

// reverse a string using toCharArray() method
class ReverseUsingToCharArrayMethod
{
   public static void main(String[] args)
   {
      String str = "Hello World Java";
      char[] chTemp = str.toCharArray();
      int left, right = 0;
      right = chTemp.length - 1;
      for(left = 0; left < right ; left++, right--)
      {
         // swap values
         char temp = chTemp[left];
         chTemp[left] = chTemp[right];
         chTemp[right]=temp;
      }
      for(char c : chTemp)
         System.out.print(c);
      System.out.println();
   }
}