Question

Write a method called makeStars. The method receives an int parameter that is guaranteed not to be negative. The method returns a String whose length equals the parameter and contains no characters other than asterisks. Thus, makeStars(8) will return ******** (8 asterisks). The method must not use a loop of any kind (for, while, do-while) nor use any String methods other than concatenation. Instead, it gets the job done by examining its parameter, and if zero returns an empty string otherwise returns the concatenation of an asterisk with the string returned by an appropriately formulated recursive call to itself.

Answer 1

Answer:

// import the Scanner class

// to allow the program receive user input

import java.util.Scanner;

// The class Solution is defined

public class Solution{

   // main method to begin program execution

   public static void main(String[] args) {

       // scanner object scan is declared

       Scanner scan = new Scanner(System.in);

       // Prompt the user to enter a number

       System.out.println("Enter the number of stars you want: ");

       // user input is assigned to numOfStar

       int numOfStar = scan.nextInt();

       // call the makeStars method

       makeStars(numOfStar);

   }

   

   // makeStars method print stars using recursion

   // the method call itself till starNum == 0

   public static void makeStars(int starNum){

       if (starNum != 0){

           System.out.print("*");

           makeStars(starNum -1);

       }

   }

}

Explanation:

The code is well comment and solve the problem using recursion.