java线程池示例

Java Thread join method can be used to pause the current thread execution until unless the specified thread is dead. There are three overloaded join functions.

Java Thread join方法可用于暂停当前线程执行，直到指定的线程死亡为止。 有三个重载的联接函数。

Java线程连接 (Java Thread join)

public final void join(): This java thread join method puts the current thread on wait until the thread on which it’s called is dead. If the thread is interrupted, it throws InterruptedException.

public final void join（） ：此java线程连接方法将当前线程置于等待状态，直到调用它的线程死亡为止。 如果线程被中断，则抛出InterruptedException。

public final synchronized void join(long millis): This java thread join method is used to wait for the thread on which it’s called to be dead or wait for specified milliseconds. Since thread execution depends on OS implementation, it doesn’t guarantee that the current thread will wait only for given time.

公共最终同步的void join（long millis） ：此java线程连接方法用于等待调用它的线程失效或等待指定的毫秒数。 由于线程执行取决于OS实现，因此不能保证当前线程将仅等待给定时间。

public final synchronized void join(long millis, int nanos): This java thread join method is used to wait for thread to die for given milliseconds plus nanoseconds.

公共最终同步void join（long millis，int nanos） ：此java线程连接方法用于在给定的毫秒数与纳秒之间等待线程死亡。

Here is a simple example showing usage of Thread join methods. The goal of the program is to make sure main is the last thread to finish and third thread starts only when first one is dead.

这是一个简单的示例，显示了线程连接方法的用法。 该程序的目标是确保main是最后一个线程完成而第三个线程仅在第一个线程死时才启动。

package com.journaldev.threads;public class ThreadJoinExample {public static void main(String[] args) {Thread t1 = new Thread(new MyRunnable(), "t1");Thread t2 = new Thread(new MyRunnable(), "t2");Thread t3 = new Thread(new MyRunnable(), "t3");t1.start();//start second thread after waiting for 2 seconds or if it's deadtry {t1.join(2000);} catch (InterruptedException e) {e.printStackTrace();}t2.start();//start third thread only when first thread is deadtry {t1.join();} catch (InterruptedException e) {e.printStackTrace();}t3.start();//let all threads finish execution before finishing main threadtry {t1.join();t2.join();t3.join();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println("All threads are dead, exiting main thread");}}class MyRunnable implements Runnable{@Overridepublic void run() {System.out.println("Thread started:::"+Thread.currentThread().getName());try {Thread.sleep(4000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("Thread ended:::"+Thread.currentThread().getName());}}

Output of the above program is:

上面程序的输出是：

Thread started:::t1
Thread started:::t2
Thread ended:::t1
Thread started:::t3
Thread ended:::t2
Thread ended:::t3
All threads are dead, exiting main thread

That’s all for a quick roundup on java thread join example.

这就是对Java线程连接示例的快速汇总。

翻译自: https://www.journaldev.com/1024/java-thread-join-example

java线程池示例