Java program to reverse a string without worrying about a null.

ReverseString.java

public class ReverseString{

     public static void main(String []args){
        String myString = "this is the test";
        System.out.println(reverse(myString));
     }
     
     public static String reverse(String str){
         System.out.println("Original Length " + str.length());
         char[] data = str.toCharArray();
         int i = 0;
         int j = data.length - 1;
         char temp;
         
         while(i<j){
             temp = data[i];
             data[i] = data[j];
             data[j] = temp;
             i++;
             j--;
         }
         
         String s = new String(data);
         System.out.println("Modified Length " + s.length());
         return s;
         
     }
}