java - Java中如何区分RUNNING状态和java.lang.Thread.State.RUNNABLE

Question

当线程RUNNABLE 时，它可以运行，也可以不运行。有没有办法将它与 java.lang.Thread.State#RUNNABLE 区分开来？

Java文档中线程的所有状态:

java.lang public class Thread.State

extends Enum

A thread state. A thread can be in one of the following states:

NEW A thread that has not yet started is in this state.

RUNNABLE A thread executing in the Java virtual machine is in this state.

BLOCKED A thread that is blocked waiting for a monitor lock is in this state.

WAITING A thread that is waiting indefinitely for another thread to perform a particular action is in this state.

TIMED_WAITING A thread that is waiting for another thread to perform an action for up to a specified waiting time is in this state.

TERMINATED A thread that has exited is in this state.

A thread can be in only one state at a given point in time. These states are virtual machine states which do not reflect any operating system thread states.

package bj.thread;

public class ThreadApp2 {

    public static void main(String[] args) {
        System.out.println(Thread.currentThread().getState());
    }
}

输出:

RUNNABLE

Answer 1

如您所说，可运行线程实际上可能正在运行，也可能未运行。由操作系统给线程运行时间。 不过，Java 规范并未将此称为单独的状态。一个正在运行的线程仍然处于可运行状态，无法通过 java 以简单的方式区分这两种状态。