JAVA 线程状态转换
2024-09-29 23:06:12
Thread类中State枚举定义：
public enum State {
/**
* Thread state for a thread which has not yet started.
*/
NEW,
/**
* Thread state for a runnable thread. A thread in the runnable
* state is executing in the Java virtual machine but it may
* be waiting for other resources from the operating system
* such as processor.
*/
RUNNABLE,
/**
* Thread state for a thread blocked waiting for a monitor lock.
* A thread in the blocked state is waiting for a monitor lock
* to enter a synchronized block/method or
* reenter a synchronized block/method after calling
* {@link Object#wait() Object.wait}.
*/
BLOCKED,
/**
* Thread state for a waiting thread.
* A thread is in the waiting state due to calling one of the
* following methods:
* <ul>
* <li>{@link Object#wait() Object.wait} with no timeout</li>
* <li>{@link #join() Thread.join} with no timeout</li>
* <li>{@link LockSupport#park() LockSupport.park}</li>
* </ul>
*
* <p>A thread in the waiting state is waiting for another thread to
* perform a particular action.
*
* For example, a thread that has called <tt>Object.wait()</tt>
* on an object is waiting for another thread to call
* <tt>Object.notify()</tt> or <tt>Object.notifyAll()</tt> on
* that object. A thread that has called <tt>Thread.join()</tt>
* is waiting for a specified thread to terminate.
*/
WAITING,
/**
* Thread state for a waiting thread with a specified waiting time.
* A thread is in the timed waiting state due to calling one of
* the following methods with a specified positive waiting time:
* <ul>
* <li>{@link #sleep Thread.sleep}</li>
* <li>{@link Object#wait(long) Object.wait} with timeout</li>
* <li>{@link #join(long) Thread.join} with timeout</li>
* <li>{@link LockSupport#parkNanos LockSupport.parkNanos}</li>
* <li>{@link LockSupport#parkUntil LockSupport.parkUntil}</li>
* </ul>
*/
TIMED_WAITING,
/**
* Thread state for a terminated thread.
* The thread has completed execution.
*/
TERMINATED;
}
- sleep(long)
public class MyThread implements Runnable {
@Override
public void run() {
System.out.println(Thread.currentThread().getName()+"========="+Thread.currentThread().getState());
try {
Thread.sleep(10000L);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
测试i类：
public class ThreadTest {
public static void main(String[] args) throws InterruptedException {
Thread t=new Thread(new MyThread());
t.start();
Thread.sleep(1000L);
System.out.println(t.getName()+">>>>>>>"+t.getState());
}
}
运行结果：
Thread-0=========RUNNABLE
Thread-0>>>>>>>TIMED_WAITING Process finished with exit code 0
- join()
public class MyThread implements Runnable {
private Thread parent;
public MyThread(Thread thread) {
parent = thread;
}
@Override
public void run() {
System.out.println(Thread.currentThread().getName() + "=========" + Thread.currentThread().getState());
long startTime = System.currentTimeMillis();
while ((System.currentTimeMillis() - startTime) / 1000 <= 2) {
}
System.out.println(parent.getName() + ">>>>" + parent.getState());
}
}
测试代码：
public class ThreadTest {
public static void main(String[] args) throws InterruptedException {
Thread t=new Thread(new MyThread(Thread.currentThread()));
t.start();
Thread.sleep(1000L);
System.out.println(t.getName()+">>>>>>>"+t.getState());
System.out.println(t.getName()+".join...");
t.join();
System.out.println(t.getName()+">>>>>>>"+t.getState());
System.out.println(Thread.currentThread().getName()+">>>>>>>"+Thread.currentThread().getState());
}
}
运行结果：
Thread-0=========RUNNABLE
Thread-0>>>>>>>RUNNABLE
Thread-0.join...
main>>>>WAITING
Thread-0>>>>>>>TERMINATED
main>>>>>>>RUNNABLE
- wait()
public class TestService {
private static Object lock=new Object();
public void test() throws InterruptedException {
synchronized (lock) {
System.out.println(Thread.currentThread().getName() + ":" + Thread.currentThread().getState());
lock.wait();
}
}
}
public class MyThread implements Runnable {
private TestService testService;
public MyThread(TestService testService) {
this.testService = testService;
}
@Override
public void run() {
try {
testService.test();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
测试代码：
public class ThreadTest {
public static void main(String[] args) throws InterruptedException {
Thread t=new Thread(new MyThread(new TestService()));
t.start();
Thread.sleep(1000L);
System.out.println(t.getName()+":"+t.getState());
}
}
运行结果：
Thread-0:RUNNABLE
Thread-0:WAITING
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