Java 12 New Features from Coding compiler. It’s time for
Shenandoah: A Low-Pause-Time Garbage Collector
This experimental feature addresses Shenandoah, a new garbage collection (GC) algorithm. The algorithm is intended for applications that prefer responsiveness and predictability.
This feature reduces the interruption of programs running in available memory to a few milliseconds.
The algorithm reduces the pause time for garbage collection by performing cleanup at the same time as running Java threads. Shenandoah handles parallel processor cycles and space to improve performance. In this case, the pause time is the same and does not depend on the size of the heap.
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switch
This improvement extends the switch statement . A multithreaded operator sends expressions to be executed by other parts of the code.And here’s a good example. Overly verbose, a break statement often masks difficult debugging errors:
switch (day) {
case MONDAY:
case FRIDAY:
case SUNDAY:
System.out.println(6);
break;
case TUESDAY:
System.out.println(7);
break;
case THURSDAY:
case SATURDAY:
System.out.println(8);
break;
case WEDNESDAY:
System.out.println(9);
break;
}
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The new label case L -> means that the code on the right will be executed only if it matches the label. So the previous code can be rewritten as:
switch (day) {
case MONDAY, FRIDAY, SUNDAY -> System.out.println(6);
case TUESDAY -> System.out.println(7);
case THURSDAY, SATURDAY -> System.out.println(8);
case WEDNESDAY -> System.out.println(9);
}
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G1 Improvements
Java 12 contains two updates to the G1, the default garbage collector. The first helps G1 interrupt mixed collections when the pause time is exceeded.
G1 uses an analysis engine to select the amount of work needed for garbage collection. It collects live objects without stopping after defining a set and starting a cleanup. This causes the garbage collector to exceed the target pause time. This problem solves the improvement.
The second improvement of G1 is aimed at returning unused allocated memory.
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G1 returns memory from a heap in full GC or during a parallel loop. G1 tries to prevent a full GC and starts a parallel loop based on the distribution of the heap. We’ll have to force G1 to return memory from the heap.
The second improvement focuses on speed by automatically returning memory from the heap to the OS when G1 is not in use.
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Something else?
Yes, that’s not all. Other features introduced in Java 12:
- Microbenchmark Suite – adds a basic set of benchmarks to the JDK source code. This makes it easier for developers to run and create performance tests.
- JVM Constants API – represents an API for modeling nominal descriptions of key class files and run-time artifacts (constants from a pool of constants). This API will be useful for tools that manage Java classes and methods.
- Default CDS Archives – accelerates the build time of the JDK by creating a class data-sharing archive (CDS).
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Is it necessary?
Java does not stand still, and it’s great! With each update, the language acquires improvements. However, the new functionality is not easy to implement in large systems and in the corporate segment. Not to mention compatibility with legacy code and local crutches.
Java 8 is an old player who remains the leader. We assume that this picture will continue in the near future.
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It may seem that such a fast paced language update is redundant. The fact is that the six-month updates are designed to implement the “minor” functions as soon as possible. So Java tries to compete with other languages.
Java is heading for the preservation and expansion of the audience, giving its own power and popularity to novice developers and industry veterans. It remains to be impatiently wait for Java 13!
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