Simple Java class containing methods for performing common actions on Strings.

StringUtilities.java

public class StringUtilities
{
  /**
   * Check if input string is a vowel
   * Author: http://stackoverflow.com/users/1357341/arshajii
   **/
  public static boolean isVowel(String inStr)
  {
    return "aeiou".indexOf(inStr.toLowerCase()) >= 0; 
    
  }
  
  /** 
   * Check if input string is a consonant
   * Author: http://stackoverflow.com/users/1357341/arshajii
   **/
  public static boolean isConsonant(String inStr)
  {
    return "bcdfghjklmnpqrstvwxyz".indexOf(inStr.toLowerCase()) >= 0;
  }
  
  /** Given a String array containing words, 
   *  join the elements of the array with the 
   *  given separator and return to caller
   *  Author: http://stackoverflow.com/users/4108825/ivanp
   **/
  public static String join(String[] strArr, String separator)
  {
    String returnVal = "";
    for(String s: strArr){ returnVal += separator + s; }
    return returnVal.replaceFirst(separator, "");
  }