尝试将 Project Loom/虚拟线程与 OpenJDK 19-loom JAVA 一起使用时出现问题

Question

我正在尝试用 Java 测试虚拟线程参考 loom 项目，并且使用以下 JDK 19-loom 版本：

  package com;

import java.util.concurrent.ThreadFactory;

    public class a {
    
    
        public static void main (String [] args) throws Exception{
            Runnable printThread = () -> System.out.println(Thread.currentThread());
    
            ThreadFactory virtualThreadFactory = Thread.builder().virtual().factory();
            ThreadFactory kernelThreadFactory = Thread.builder().factory();
    
            Thread virtualThread = virtualThreadFactory.newThread(printThread);
            Thread kernelThread = kernelThreadFactory.newThread(printThread);
    
            virtualThread.start();
            kernelThread.start();
    
        }
    }

我有以下 IntelliJ 配置：

但我有以下错误：

而且线程的构建者似乎没有被识别

我想知道我还需要什么？

Answer 1

您正在使用一个过时的示例。

根据 Loom 的当前状态，您的示例必须如下所示

public static void main(String[] args) throws InterruptedException {
    Runnable printThread = () -> System.out.println(Thread.currentThread());

    ThreadFactory virtualThreadFactory = Thread.ofVirtual().factory();
    ThreadFactory kernelThreadFactory = Thread.ofPlatform().factory();

    Thread virtualThread = virtualThreadFactory.newThread(printThread);
    Thread kernelThread = kernelThreadFactory.newThread(printThread);

    virtualThread.start();
    kernelThread.start();

    virtualThread.join();
    kernelThread.join();
}

但您也可以使用简化的

public static void main(String[] args) throws InterruptedException {
    Runnable printThread = () -> System.out.println(Thread.currentThread());

    Thread virtualThread = Thread.startVirtualThread(printThread);
    Thread kernelThread = Thread.ofPlatform().start(printThread);

    virtualThread.join();
    kernelThread.join();
}

请记住，这是一项正在进行的工作，文档可能很快就会过时。