@Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; TaskCharSet other = (TaskCharSet) obj; if (taskChars == null) { if (other.taskChars != null) return false; } else { return this.toJoinedStringOfIdentifiers().equals(other.toJoinedStringOfIdentifiers()); } return true; }