Reverse words in a given String using recursion

Reverse words in a given String using recursion. We need to reverse words by words in a given line and not the character in a given string. We need to solve this by using backtracking and recursion logic.

Let's see simple Java code for getting the given of words in a reverse order by using recursion.

public class ReverseLineByWords {

 public static void main(String[] args) {
  
  String str = "Hello Java Discover";
  
  String finalStr = new ReverseLineByWords().reverseLine(str);
  
  System.out.println(finalStr);
  
 }
 
 public String reverseLine(String str){
  String word = "";
  int i = 0;
  for(;i<str.length();i++){
   if(str.charAt(i) == ' ') {
    word = word + " ";
    break;
   }else{
    word = word + str.charAt(i);
   }
  }

  if(i < str.length()) 
   return reverseLine(str.substring(i+1)) + word;
  
  return (word + " ");
 }
}

OUTPUT:

Discover Java Hello