How to use

CharSequenceUtils$6

in

org.netbeans.modules.cnd.utils.cache

  @Override
  public String toString() {
    return new StringBuilder(length()).append(s1).append(s2).append(s3).append(s4).toString();
  }
};

@Override
public CharSequence subSequence(int start, int end) {
  return new StringBuilder(length()).append(s1).append(s2).append(s3).append(s4).subSequence(start, end);
}