Summary

Add -source and -target and --release options to javac corresponding to JDK 16.

Problem

Part of starting development on a new JDK is adding .new -source and -target options to javac. These options are used in the compilation of the JDK sources.

Solution

Add 16 as a valid argument to the options in question.

Specification

Add support for javac -source 16 ..., and javac -target 16 ..., and javac --release 16 ....

The new value of -source/-target is also made the default.