java - Java 中的多线程

Question

我有一个循环，例如 for (int i=1;i<=10;i++)我想在其中创建 10 个线程，每个线程对一组数据执行相同的任务并返回结果。然后在循环内处理这个结果。有什么想法可以做到这一点吗？

for (int i=1;i<=10;i++) {
    Work w = new Work();
    Thread t = new Thread(w);
    w.getResultFromThread();
    //process w
}

class Work implements Runnable {
     public void run() {
      //perform tasks
     }

     public int getResultFromThread() {
          return result;
     }
}

我希望每个线程并行工作，但是当我收到结果时，它是一一的。

Answer 1

如果您不想使用执行器，您可以通过以下方式进行:

int size = 10;
Thread[] threads = new Thread[size];
Work[] works = new Work[size];
for (int i = 1; i <= size; i++) {

    Work w = new Work();
    works[i - 1] = w;
    Thread t = new Thread(w);
    threads[i - 1] = t;

    // Start the thread
    t.start();
}
// now you have started all the threads


for (int i = 0; i < size; i++) {

    // wait for each thread to complete execution, before extracting the result
    // [here i am assuming that getResultFromThread() does not block
    // till we get the result, if it blocks, then no need to join]
    threads[i].join();

    int result = works[i].getResultFromThread();
    // do something with the result
}