Define six states: java.lang.Thread.State
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New: thread state of the thread has not been started.
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Runnable: Thread state runnable threads waiting for CPU scheduling.
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Blocked: the thread blocked waiting for the lock monitor thread state.
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Waiting: waiting thread state of the thread. Without timeout following way:
Object.waiting、Thread.join、LockSupport.port
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Timed Waiting: waiting thread with a specified waiting time thread state. In the following manner with timeout:
Thread.sleep、Object.wait、Thread.join、LockSupport.parkNanos、LockSupport.parkUntil
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Terminated: thread state to terminate the thread. Normal thread execution is completed or abnormal.
package firthChapter;
/**
* 示例二,多线程运行状态切换示意
* @author yekaifei
*/
public class Demo2 {
//第一种状态切换: 新建->运行->终止
//第二种状态切换: 新建->运行->等待->运行->终止
//第三种状态切换: 新建->运行->阻塞->运行->终止
public static void main(String[] args) throws InterruptedException {
System.out.println("第一种状态切换: 新建->运行->终止");
Thread thread1 = new Thread(new Runnable() {
public void run() {
System.out.println("thread1当前状态:" + Thread.currentThread().getState().toString());
System.out.println("thread1执行了");
}
});
System.out.println("thread1未运行时状态:" + thread1.getState().toString());
thread1.start();
Thread.sleep(2000);
System.out.println("线程睡眠两秒等待thread1运行完毕查看状态:" + thread1.getState().toString());
// thread1.start(); TODO 注意若线程终止后再调用会报一个java.lang.IllegalThreadStateException
System.out.println("-------------------------------------------------");
System.out.println("第二种状态切换: 新建->运行->等待->运行->终止");
Thread thread2 = new Thread(new Runnable() {
public void run() {
System.out.println("thread2当前状态:" + Thread.currentThread().getState().toString());
System.out.println("thread2正在执行");
try {
System.out.println("thread线程进入等待");
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("thread2睡眠完毕后当前状态:" + Thread.currentThread().getState().toString());
}
});
System.out.println("thread2未运行时状态:" + thread2.getState().toString());
thread2.start();
Thread.sleep(1000);
System.out.println("线程睡眠1s等待thread2进入睡眠查看状态:" + thread2.getState().toString());
Thread.sleep(1000);
System.out.println("线程再睡眠1s等待thread2运行完毕后查看状态:" + thread2.getState().toString());
System.out.println("-------------------------------------------------");
System.out.println("第三种状态切换: 新建->运行->阻塞->运行->终止");
Thread thread3 = new Thread(new Runnable() {
public void run() {
System.out.println("thread3当前状态:" + Thread.currentThread().getState().toString());
synchronized (Demo2.class){
System.out.println("thread3当前状态:" + Thread.currentThread().getState().toString());
}
}
});
synchronized (Demo2.class) {
System.out.println("thread3未运行时状态:" + thread3.getState().toString());
thread3.start();
Thread.sleep(500);
System.out.println("thread3进入阻塞状态:" + thread3.getState().toString());
}
Thread.sleep(2000);
System.out.println("线程睡眠2s等待thread3运行完毕查看状态:" + thread3.getState().toString());
}
}
运行结果:
firthChapter.Demo2
第一种状态切换: 新建->运行->终止
thread1未运行时状态:NEW
thread1当前状态:RUNNABLE
thread1执行了
线程睡眠两秒等待thread1运行完毕查看状态:TERMINATED
第二种状态切换: 新建->运行->等待->运行->终止
thread2未运行时状态:NEW
thread2当前状态:RUNNABLE
thread2正在执行
thread线程进入等待
线程睡眠1s等待thread2进入睡眠查看状态:TIMED_WAITING
thread2睡眠完毕后当前状态:RUNNABLE
线程再睡眠1s等待thread2运行完毕后查看状态:TERMINATED
第三种状态切换: 新建->运行->阻塞->运行->终止
thread3未运行时状态:NEW
thread3当前状态:RUNNABLE
thread3进入阻塞状态:BLOCKED
thread3当前状态:RUNNABLE
线程睡眠2s等待thread3运行完毕查看状态:TERMINATED
Process finished with exit code 0