[英]Java Thread: How to execute a statement simultaneously
Consider I have a run method as below, I am trying to create four threads for MyThread. 考虑到我有一个运行方法如下,我试图为MyThread创建四个线程。 Statement 1 to 3 can either run at same time by threads or differently.
语句1到3可以同时在线程中运行,也可以不同地运行。 But I want Statement 4 to be executed by threads at a same time.
但是我希望语句4由线程同时执行。 Can I pool all threads before statement 4 and execute statement 4 at a same time by all threads?
我可以在语句4之前合并所有线程并由所有线程同时执行语句4吗?
class MyThread extends Thread
{
public void run()
{
//Statement 1
//Statement 2
//Statement 3
//Statement 4
}
}
Use CyclicBarrier, it is best suited for your requirement. 使用CyclicBarrier,它最适合您的要求。
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
public class CyclicBarrierUsage {
private static final int NUMBER_OF_THREADS = 2;
public static void main(String[] args) {
CyclicBarrier barrier = new CyclicBarrier(NUMBER_OF_THREADS);
Thread t1 = new Thread(new PrimaryParty(barrier));
Thread t2 = new Thread(new PrimaryParty(barrier));
t1.start();
t2.start();
}
}
class PrimaryParty implements Runnable {
private CyclicBarrier barrier;
public PrimaryParty(CyclicBarrier barrier) {
this.barrier = barrier;
}
@Override
public void run() {
//Statement 1
//Statement 2
//Statement 3
try {
barrier.await();
} catch (InterruptedException | BrokenBarrierException e) {
e.printStackTrace();
}
//Statement 4
}
}
There are a few ways to do what you want. 有几种方法可以做您想要的。 Perhaps the easiest way is by using Java's implementation of Future .
也许最简单的方法是使用Java的Future实现。 You can define one (or more) Futures which will execute on separate threads, block until they are all done with Future.get() , and then complete your other tasks based on the results.
您可以定义一个(或多个)Future,它们将在单独的线程上执行,阻塞,直到它们全部由Future.get()完成,然后根据结果完成其他任务。
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