how to reverse a string in java

public class ReverseString {
    public static void main(String[] args) {
        String s1 = "neelendra";
        for(int i=s1.length()-1;i>=0;i--)
            {
                System.out.print(s1.charAt(i));
            }
    }
}

public class StringReverseExample{
   public static void main(String[] args) {
      String string = "abcdef";
      String reverse = new StringBuffer(string).reverse().toString();
      System.out.println("\nString before reverse: "+string);
      System.out.println("String after reverse: "+reverse);
   }
}

public class ReverseStringByFavTutor

{

   public static void main(String[] args) {


       String stringExample  =  "FavTutor";

       System.out.println("Original string: "+stringExample);


       // Declaring a StringBuilder and converting string to StringBuilder

       StringBuilder reverseString = new StringBuilder(stringExample);


       reverseString.reverse();  // Reversing the StringBuilder


       // Converting StringBuilder to String

       String result = reverseString.toString();


       System.out.println("Reversed string: "+result); // Printing the reversed String


   }

}

String reverse(String s) { 
   if(s.length() == 0) 
     return ""; 
   return s.charAt(s.length() - 1) + reverse(s.substring(0,s.length()-1)); 
 }