Reversing the words in a Sentence

public class Rev_sentence {
 
  public static void main(String[] args) {
  String input = new String("HI ram");
  // op : mar IH => ram HI
  String reverse = new StringBuffer(input).reverse().toString();
  System.out.println(reverse);
 
  String[] str = input.split(" ");
 
  StringBuffer sb=new StringBuffer();
  for(int i=str.length-1;i>=0;i--){
    sb.append(str[i]);
    sb.append(" ");
  }
  System.out.println(sb);
 
  }

}