Program to reverse the order of words in a sentence

Reverse the order of words in a sentence, but keep words themselves unchanged. Words in a sentence are divided by blanks. For instance, the reversed output should be “student. a am I” when the input is “I am a student”..

 public class ReverseWords 

{

public static void main(String[] args) 

{  

    String s="I am a student";

    String result=reverseWord(s);  

    System.out.println(result.substring(1));  

}  

    public static String reverseWord(String s)  

{  

    String[] str=s.split(" ");

    String rev="";

    for(int i=str.length-1;i>=0;i--)

          {  

                rev=rev+" "+str[i];  }  return rev;  

           } 

}