如何在Java中使用单独的线程调用方法？ [英] How to call a method with a separate thread in Java?

问题描述

假设我有一个方法 doWork（）。如何从单独的线程（而不是主线程）调用它。

let's say I have a method doWork(). How do I call it from a separate thread (not the main thread).

推荐答案

创建一个实现<$ c的类$ c> Runnable 界面。将您想要运行的代码放在 run（）方法中 - 这是您必须编写的方法，以符合 Runnable 界面。在主线程中，创建一个新的 Thread 类，将构造函数传递给 Runnable 的实例，然后调用 start（）就可以了。 start 告诉JVM创建一个新线程，然后在该新线程中调用 run 方法。

Create a class that implements the Runnable interface. Put the code you want to run in the run() method - that's the method that you must write to comply to the Runnable interface. In your "main" thread, create a new Thread class, passing the constructor an instance of your Runnable, then call start() on it. start tells the JVM to do the magic to create a new thread, and then call your run method in that new thread.

public class MyRunnable implements Runnable {

    private int var;

    public MyRunnable(int var) {
        this.var = var;
    }

    public void run() {
        // code in the other thread, can reference "var" variable
    }
}

public class MainThreadClass {
    public static void main(String args[]) {
        MyRunnable myRunnable = new MyRunnable(10);
        Thread t = new Thread(myRunnable)
        t.start();
    }    
}

看看 Java的并发教程开始使用。

如果你的方法将被频繁调用，然后每次创建一个新线程可能都不值得，因为这是一个昂贵的操作。最好使用某种线程池。看一下 Future ， Callable ， Executor 中的类 java.util.concurrent 包。

If your method is going to be called frequently, then it may not be worth creating a new thread each time, as this is an expensive operation. It would probably be best to use a thread pool of some sort. Have a look at Future, Callable, Executor classes in the java.util.concurrent package.

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