Remove specified chars from a string

 
import java.util.HashSet;
import java.util.Set;

public class Main {

  public static String removeCharsFromString(String aString, char[] unWantedCharArray) {
      Character character = null;
      Set unWantedCharSet = new HashSet();
      for (int i = 0; i < unWantedCharArray.length; i++) {
          character = new Character(unWantedCharArray[i]);
          unWantedCharSet.add(character);
      }
      StringBuffer result = new StringBuffer(aString.length());
      for (int i = 0; i < aString.length(); i++) {
          character = new Character(aString.charAt(i));
          if (!unWantedCharSet.contains(character)) {
              result.append(aString.charAt(i));
          }
      }
      return result.toString();
  }
}