Count Vowels and Consonants in String

Count the number of vowels and consonants in a given string. Return a Map with keys 'vowels' and 'consonants' containing the respective counts. Only count alphabetic characters (a-z, A-Z). Ignore spaces, numbers, and special characters.

Method Signature

public static Map<String, Integer> countVowelsConsonants(String str)

Examples

Example 1:

Input: "Hello World"
Output: {"vowels" => 3, "consonants" => 7}
Explanation: Vowels are 'e', 'o', 'o' (3 total). Consonants are 'H', 'l', 'l', 'W', 'r', 'l', 'd' (7 total).

Example 2:

Input: "AEIOU"
Output: {"vowels" => 5, "consonants" => 0}
Explanation: All characters are vowels.

Example 3:

Input: "xyz123"
Output: {"vowels" => 0, "consonants" => 3}
Explanation: Only 'x', 'y', 'z' are consonants. The numbers '123' are ignored.

Example 4:

Input: null
Output: null
Explanation: Return null for null input.
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