[JAVA] Turn off the format function only in the specified part in Eclipse

Confirmed with Eclipse IDE for Enterprise Java Developers 2019-06 (4.12.0).

Open Window-> Preferences-> Java-> Code Style-> Formatter-> Edit-> Off / On Tags and check Enable Off / On tags.

In the source code, use `// @ formatter: off``` to start the format OFF and use `//@ formatter: on``` to restart it with ON. It looks like the following.

//@formatter:off
list
  .stream()
  .filter(s -> s.endsWith(".txt"))
  .map(s -> NumberUtils.toInt(s))
  .collect(Collectors.toList());
//@formatter:on