线程有6个状态,可以查看java.lang.Thread.State
| 状态 | 描述 |
|---|---|
| New | 尚未启动的线程的线程状态 |
| Runnable | 可运行线程的线程状态,等待CPU调度 |
| Blocked | 线程阻塞等待监视器锁定的线程状态 |
| Waiting | 等待线程的线程状态.下列不带超时的方式:Object.wait,Thread.join,LockSupport.park |
| Timed Waiting | 具有制定等待时间的等待线程的线程状态.下列带超时的方式:Thread.sleep,Object.wait,Thread.join,LockSupport.parkNanos,LockSupport.parkUntil |
| Terminated | 终止线程的线程状态,线程正常完成执行或者出现异常 |
/**
* 多线程运行状态切换示例 <br/>
*/
public class Demo2 {
public static Thread thread1;
public static Demo2 obj;
public static void main(String[] args) throws Exception {
// 第一种状态切换 - 新建 -> 运行 -> 终止
System.out.println("#######第一种状态切换 - 新建 -> 运行 -> 终止################################");
Thread thread1 = new Thread(new Runnable() {
@Override
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("没调用start方法，thread1当前状态：" + thread1.getState().toString());
thread1.start();
Thread.sleep(2000L); // 等待thread1执行结束，再看状态
System.out.println("等待两秒，再看thread1当前状态：" + thread1.getState().toString());
// thread1.start(); TODO 注意，线程终止之后，再进行调用，会抛出IllegalThreadStateException异常
System.out.println();
System.out.println("############第二种：新建 -> 运行 -> 等待 -> 运行 -> 终止(sleep方式)###########################");
Thread thread2 = new Thread(new Runnable() {
@Override
public void run() {
try {// 将线程2移动到等待状态，1500后自动唤醒
Thread.sleep(1500);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("thread2当前状态：" + Thread.currentThread().getState().toString());
System.out.println("thread2 执行了");
}
});
System.out.println("没调用start方法，thread2当前状态：" + thread2.getState().toString());
thread2.start();
System.out.println("调用start方法，thread2当前状态：" + thread2.getState().toString());
Thread.sleep(200L); // 等待200毫秒，再看状态
System.out.println("等待200毫秒，再看thread2当前状态：" + thread2.getState().toString());
Thread.sleep(3000L); // 再等待3秒，让thread2执行完毕，再看状态
System.out.println("等待3秒，再看thread2当前状态：" + thread2.getState().toString());
System.out.println();
System.out.println("############第三种：新建 -> 运行 -> 阻塞 -> 运行 -> 终止###########################");
Thread thread3 = new Thread(new Runnable() {
@Override
public void run() {
synchronized (Demo2.class) {
System.out.println("thread3当前状态：" + Thread.currentThread().getState().toString());
System.out.println("thread3 执行了");
}
}
});
synchronized (Demo2.class) {
System.out.println("没调用start方法，thread3当前状态：" + thread3.getState().toString());
thread3.start();
System.out.println("调用start方法，thread3当前状态：" + thread3.getState().toString());
Thread.sleep(200L); // 等待200毫秒，再看状态
System.out.println("等待200毫秒，再看thread3当前状态：" + thread3.getState().toString());
}
Thread.sleep(3000L); // 再等待3秒，让thread3执行完毕，再看状态
System.out.println("等待3秒，让thread3抢到锁，再看thread3当前状态：" + thread2.getState().toString());
}
}