IDEA 2023.2.2已支持JDK21
Java 21发布，IntelliJ IDEA 2023.2.2已完美支持。
想要开发Java 21代码的开发者可以升级了！
Java新特性
Java 9 - 21：新特性解读
虚拟线程
虚拟线程创建
（1）使用静态构建器方法
（2）使用Thread.ofVirtual()
（3）使用虚拟线程工厂
（4）与ExecutorService结合使用
public static void main(String[] args) throws InterruptedException {Runnable runnable = () -> {System.out.println("Hello, jdk21");};// 使用静态构建器方法Thread.startVirtualThread(runnable);// 使用Thread.ofVirtual()Thread.ofVirtual().name("jdk21-virtual-thread").start(runnable);// 使用虚拟线程工厂ThreadFactory virtualThreadFactory = Thread.ofVirtual().name("jdk21", 0).factory();Thread factoryThread = virtualThreadFactory.newThread(runnable);factoryThread.start();// 与ExecutorService结合使用try (ExecutorService executorService = Executors.newVirtualThreadPerTaskExecutor()) {for (int i = 0; i < 100; i++) {executorService.submit(runnable);}}ExecutorService executorService = Executors.newThreadPerTaskExecutor(virtualThreadFactory);for (int i = 0; i < 10; i++) {executorService.submit(() -> {System.out.println(Thread.currentThread().getName() + " is running...");try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(Thread.currentThread().getName() + " is done.");});}executorService.shutdown();executorService.awaitTermination(1, TimeUnit.MINUTES);}
虚拟线程测试
public static void main(String[] args) {int timesCount = 1000;long l1 = System.currentTimeMillis();for (int i = 0; i < timesCount; i++) {int finalI = i;Thread.ofPlatform().name("平台线程").start(() -> {System.out.println("线程名称：" + Thread.currentThread().getName() + "线程ID" + Thread.currentThread().threadId() + "执行第" + finalI + "个平台线程");});}long l2 = System.currentTimeMillis();for (int i = 0; i < timesCount; i++) {int finalI = i;Thread.ofVirtual().name("虚拟线程").start(() -> {System.out.println("线程名称：" + Thread.currentThread().getName() + "线程ID" + Thread.currentThread().threadId() + "执行第" + finalI + "个平台线程");});}System.out.println("线程分别执行 " + timesCount + " 次压测...");System.out.println("平台线程执行耗时：" + (System.currentTimeMillis() - l1) + "毫秒");System.out.println("虚拟线程执行耗时：" + (System.currentTimeMillis() - l2) + "毫秒");try {Thread.sleep(20000);} catch (InterruptedException e) {e.printStackTrace();}}
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