java futuretask callable

Consuming Futures 3. A FutureTask can be created by providing its constructor with a Callable. 在介绍 Callable 时我们知道它可以有返回值，返回值通过 Future 进行封装。FutureTask 实现了 RunnableFuture 接口，该接口继承自 Runnable 和 Future 接口，这使得 FutureTask 既可以当做一个任务执行，也可以有返回值。 This guide teaches you concurrent programming in Java 8 with easily understood code examples. submit() will take care of starting the task and return a FutureTask object, which is an implementation of the Future interface. Java FilenameFilter Example. Executors class provide useful methods to execute Callable in a thread pool. Once we have an ExecutorService object, we just need to call submit() passing our Callable as an argument. My favorite for simple tasks: Executors.newSingleThreadExecutor().submit(task); little bit shorter than creating a Thread (task is a Callable or a Runnable) FutureTask. Then the FutureTask object is provided to the constructor of Thread to create the Thread object. Since callable tasks run in parallel, we have to wait for the returned Object. We can use FilenameFilter in java to find all the files of a specific extension in a directory. Welcome to the first part of my Java 8 Concurrency tutorial. Below is the program showing how to use FileNameFilter in java. The FutureTask class is an implementation of Future that implements Runnable, and so may be executed by an Executor. The Callable interface uses Generics to define the return type of Object. From Java 8 onwards, FileNameFilter is a functional interface since it has a single method. FutureTask is a good option as the other options from the java.util.concurrent package. Callable tasks return java.util.concurrent.Future object. The Java library has the concrete type FutureTask, which implements Runnable and Future, combining both functionality conveniently. It's the first part out of a series of tutorials covering the Java Concurrency API. For example, the above construction with submit could be replaced by: FutureTask future = new FutureTask(new Callable() { public String call() { return searcher.search(target); }}); executor.execute(future);
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