code: @Deprecated
      @Override
      protected int write(int unit) {
          int newLength=charsLength+1;
          ensureCapacity(newLength);
          charsLength=newLength;
          chars[chars.length-charsLength]=(char)unit;
          return charsLength;
      }
docs: {@inheritDoc}
  @deprecated This API is ICU internal only.
  @hide draft / provisional / internal are hidden on Android