Java Data Type - 如何打印没有元音的扫描字符串

public class Main {

  public static void main(String argv[]) {

    String noVowels = takeOutVowel("Hello how are you?");
    System.out.println(noVowels); // prints "Hll hw r y?"
  }

  private static String takeOutVowel(String s) {
    return s.replaceAll("[aeiou]", "");
  }
}