线程状态
线程状态
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系统调度
- 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。处于synchronized同步代码块或方法中被阻塞。
- 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:具有指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。
示例1
package com.study.hc.thread.chapter1.thread;
/**
* 示例2 - 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:" + thread3.getState().toString());
}
}
执行结果
记得加油学习哦^_^