The second characteristic, late barrier enlargement, is meant to simplify the implementation of G1’s boundaries. The rubbish collector’s boundaries document details about utility reminiscence accesses, by shifting their enlargement from early within the C2 compilation pipeline to later. Objectives embrace decreasing the execution time of C2 compilation when utilizing the G1 collector, making G1 boundaries understandable to HotSpot builders who lack a deep understanding of C2, and guaranteeing that C2 preserves invariants concerning the relative ordering of reminiscence accesses, safepoints, and boundaries. A fourth characteristic is preserving the standard of C2-generated JIT (just-in-time)-compiled code, by way of velocity and measurement.
Extra options focusing on JDK 24 will probably be decided through the subsequent a number of months. Potential Java 24 options embrace additional previews or last releases of options being previewed in JDK 23. These embrace the class-file API, for parsing, producing, and remodeling Java class information; stream gatherers, to reinforce the stream API for customized intermediate operations; module import declarations, for succinctly importing all packages exported by a module and simplifying reuse of modular libraries; structured concurrency, to simplify concurrent programming; scoped values, for sharing immutable knowledge; and versatile constructor our bodies, giving builders larger freedom to specific habits of constructors.
One other characteristic in preview in JDK 23 and a contender for JDK 24 is primitive varieties in patterns, instanceof, and swap, which goals to reinforce sample matching by permitting primitive sort patterns in all sample contexts, and to increase instanceof and swap to work with all primitive varieties. One other potential JDK 24 characteristic is the vector API, now in an eighth incubation stage in JDK 23. The vector API is geared to expressing vector computations that reliably categorical at runtime to optimum vector directions on supported CPU architectures. Forward-of-time class loading, a characteristic designed to hurry Java startups, and string templates, a characteristic previewed in JDK 21 and JDK 22 however dropped from JDK 23, is also focused to JDK 24.
