java main是多线程的

 该段代码展示main方法中的所有线程

public class A1Test {

    public static void main(String[] args) {

        //线程管理接口中
        ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();

        ThreadInfo[] threadInfos = threadMXBean.dumpAllThreads(false, false);

        for (ThreadInfo threadInfo : threadInfos) {
            System.out.println(threadInfo.getThreadName());
        }

    }
}