Question

​​​​​​public static int countCharacter(String str, char c)

{

// This recursive method takes a String and a char as parameters and

// returns the number of times the char appears in the String. You may

// use the function charAt(int i) described below to test if a single

// character of the input String matches the input char.

// For example, countCharacter(“bobbie”, ‘b’) would return back 3, while

// countCharacter(“xyzzy”, ‘y’) would return back 2.

// Must be a RECURSIVE SOLUTION

// You may need to use the following methods:

// str.substring(start,end) – returns the substring from start to end-1

// str.charAt(index) – returns the character at position index of str

// str.length() – returns the length of the string str

{

}

Answer 1

public class MyClass {
   public static int countCharacter(String s, char c) {
       if (s.length() == 0)
       return 0;
       else if (s.charAt(0) == c)
       return 1 + countCharacter(s.substring(1), c);
       else
       return countCharacter(s.substring(1), c);
       }
   public static void main(String[] args) {
       System.out.println(countCharacter("xyzzy", 'y'));
   }
  
}

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