hi friend try the code given below this may helpful for you

public class ReverseString
{
     public static void main(String args[])
       {
            String str = "hello";
            int len = str.length();
            char tempArr[]=new char[len ];
            char revArr[]=new char[len ];
            tempArr = str.toCharArray();
            int k = 0;
            for(int i=len-1; i >=0; i--)
              {
                revArr[k] = tempArr[i];
                k++;
              }

           System.out.println("Original String = "+str);
           System.out.print("Reverse String = ");
           for(int j = 0; j < len; j++)
              {
                System.out.print(revArr[j]);
              }
       }
}