Java Project Programming Help Please! Write a program that prompts for and reads

Question

Java Project Programming Help Please!

Write a program that prompts for and reads in a string, then prints a message saying how many lower case ‘x’ is in this string.

Your program should contain two methods: a main method reads in the string and a recursive (static) method countX that takes the string as input and returns the number of lowercase character ‘x’ in this string. Make sure your method solves the problem using a recursive way, not a loop structure.

The following methods might be helpful, but you are not required to use all of them:

For a string s in Java,

s.length() returns the number of charaters in s

s.charAt(i) returns the ith character of s, 0-based

s.substring(i,j) returns the substring that starts with the ith character of s and ends with the j-1st character of s (not the jth), both 0-based.

So if s=“happy”, s.length=5, s.charAt(1)=a, and s.substring(2,4) = “pp”.

Explanation / Answer

import java.util.Scanner;
public class CountCharacters
{

     public static void main(String[] args)
     {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a String: ");
        String s = sc.nextLine().toLowerCase(); //Reading string from the user
        int cn = countX(s, 'x',0, 0); // Calling function
        System.out.println("character 'x'" + " occurs " + cn + " times in String: " + s);
        sc.close();
    }
    private static int countX(String str, char c,int index,int count)
    {
          if ( str.length()>index)
          {
             if (c == str.charAt(index))
             {
                 count++;
             }
             index++;
             count = countX(str, c, index, count); //Recursive function
          }
         return count;
     }
}

Output:

Enter a String: x ix zzz xxx x

character 'x' occurs 6 times in String: x ix zzz xxx x

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