These are the easy possibilities you have.

Static Imports, to increase readability:

import static java.nio.file.StandardOpenOption.CREATE_NEW;
import static java.nio.file.StandardOpenOption.WRITE;

OpenOption[] options = new OpenOption[] { WRITE, CREATE_NEW };

Use defaults:

     //no Options anyway
     Files.newBufferedReader(path, cs)

     //default: CREATE, TRUNCATE_EXISTING, and WRITE not allowed: READ
     Files.newBufferedWriter(path, cs, options)

     //default: READ not allowed: WRITE
     Files.newInputStream(path, options)

     //default: CREATE, TRUNCATE_EXISTING, and WRITE not allowed: READ
     Files.newOutputStream(path, options)

     //default: READ do whatever you want
     Files.newByteChannel(path, options)

Finally it's possible to specify optionsets like this:

     Files.newByteChannel(path, EnumSet.of(CREATE_NEW, WRITE));

when you use the StandardOpenOption.TRUNCATE_EXISTING the length of the file is first "truncated to 0" if the file already exist before any writing:

$ jshell

jshell> import java.nio.file.*;

jshell> Path path = Paths.get("foo");
path ==> foo

jshell> Files.write(path, "AAAA".getBytes(), StandardOpenOption.WRITE, StandardOpenOption.CREATE)

I've just create a new file named "foo" containing the string "AAAA":

$ more foo
AAAA
$

now I write the string "BB" to the file without StandardOpenOption.TRUNCATE_EXISTING option:

jshell> Files.write(path, "BB".getBytes(), StandardOpenOption.WRITE, StandardOpenOption.CREATE)

and just the first two characters gets overwritten, the others are still there:

$ more foo
BBAA
$

now I write the string "BB" again but I add StandardOpenOption.TRUNCATE_EXISTING option:

jshell> Files.write(path, "BB".getBytes(), StandardOpenOption.WRITE, StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING)

the file contains just "BB" because its previous content has been "erased" by StandardOpenOption.TRUNCATE_EXISTING before the writing:

$ more foo
BB
$