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Java的Object.wait(long)在等待时间过去后会继续往后执行吗
Object.wait(long)方法相比于wait，多了个等待时长，那么当等待时长过去后，线程会继续往下执行吗？
单个线程执行
多个线程并发执行
public class ThreadWaitDemo {
public static final int WAIT_IN_SECONDS = 2;
public static final int NOTIFY_IN_SECONDS = 6;public static void main(String[] args) throws InterruptedException {ThreadWaitDemo threadWait = new ThreadWaitDemo();Thread a = new Thread(threadWait::justWaitAndPrint, "t1");Thread b = new Thread(threadWait::justNotify, "t2");a.start();// ① 先注释这段，让t1自己执行b.start();
}public synchronized void justWaitAndPrint() {try {System.out.println(Thread.currentThread().getName() + ": I am in");System.out.println(Thread.currentThread().getName() + ": I am gonna wait");long start = System.currentTimeMillis();wait(WAIT_IN_SECONDS * 1000);// 如果时间过了就可以解除等待状态的话，那么这里的时间间隔就会接近2sSystem.out.println("wait end " + (System.currentTimeMillis() - start) / 1000.0 + "seconds");} catch (Exception e) {System.out.println(Thread.currentThread().getName() + ": Oops, something bad happen " + e);}System.out.println(Thread.currentThread().getName() + ": I am out");
}public synchronized void justNotify() {try {TimeUnit.SECONDS.sleep(NOTIFY_IN_SECONDS);System.out.println(Thread.currentThread().getName() + ": I am in");} catch (Exception e) {System.out.println(Thread.currentThread().getName() + ": Oops, something bad happen " + e);}System.out.println(Thread.currentThread().getName() + ": I am out");
}
}
第一种情况下，运行结果
t1: I am in
t1: I am gonna wait
wait end 2.004seconds
t1: I am out
第二种情况下，运行结果
t1: I am in
t1: I am gonna wait
t2: I am in
t2: I am out
wait end 6.002seconds // 等待时间会随NOTIFY_IN_SECONDS变化
t1: I am out
结论：wait(long)在无锁竞争情况下，在等待时间过去后就直接重新获取锁，往后执行；但是在竞争条件下，都会等获取到锁了才可以往下执行
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