RFR (JDK11/NIO) 8201276: (fs) Add methods to Files for reading/writing a string from/to a file

[Joe Wang]

Hi,

We're looking into adding methods to Files to read a file into a 
String/write a String to a file. Below is the current proposal. Please 
review.

JBS: https://bugs.openjdk.java.net/browse/JDK-8201276

webrev: http://cr.openjdk.java.net/~joehw/jdk11/8201276/webrev/

specdiff: 
http://cr.openjdk.java.net/~joehw/jdk11/8201276/specdiff/java/nio/file/Files.html


Thanks,
Joe