Question

In Java, write a recursive function that accepts a string as its argument and prints the string in reverse order. Demonstrate the function in a driver program.

Answer 1

Answer)
Java program for the recursive function that accepts a string as its argument and prints the string in reverse order:

public class StringReversalRecursion {

   public static void main(String[] args) { // Driver main
  
       String input = "This is a Test";
      
       //Next stage, we pass the input string to the method
       String output = reverseMethod(input); // Receiving the output from the recursive method
       System.out.println("The output string is: " + output);
   }


   //Following method is used for reversal of the stirng and checking if the input stirng is empty or not. Recursion occurs in this method
   public static String reverseMethod(String input)
   {
       if (input.isEmpty()){ // checking if the input is empty or not
       System.out.println("String Reversal is complete.");  
       return input;
       }
       //Recursion calls
       return reverseMethod(input.substring(1)) + input.charAt(0); // recursive calls for the method
   }
}

Output:
String Reversal is complete.
The output string is: tseT a si sihT

Here we are using the string "This is a Test" as input and getting the output:
tseT a si sihT

using recursive method as defined : reverseMethod

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