In Javac 9, String concatenation is compiled to a dynamic invocation of a bootstrap that concatenates the string instead of using StringBuilder.
The feature should be enabled only if TARGET_PLATFORM: Option<Target> is Target.JAVA_9 and disabled if LEGACY_CONCAT: Option<Boolean> is true.
http://openjdk.java.net/jeps/280
In Javac 9, String concatenation is compiled to a dynamic invocation of a bootstrap that concatenates the string instead of using
StringBuilder.The feature should be enabled only if
TARGET_PLATFORM: Option<Target>isTarget.JAVA_9and disabled ifLEGACY_CONCAT: Option<Boolean>istrue.http://openjdk.java.net/jeps/280