下面是一个使用Future和Callable的例子: importjava.util.concurrent.*;publicclassFutureAndCallableExample{publicstaticvoidmain(String[] args)throwsExecutionException, InterruptedException {ExecutorServiceexecutor=Executors.newSingleThreadExecutor(); Future<Integer> future = executor.submit(newCallable<Integer>() {@...
CallableExample.java package com.howtodoinjava.demo.multithreading; import java.util.ArrayList; import java.util.List; import java.util.Random; import java.util.concurrent.Callable; import java.util.concurrent.ExecutionException; import java.util.concurrent.Executors; import java.util.concurrent.Future; ...
In this tutorial, we will learn to executeCallabletasks (which return a result of typeFutureafter execution) usingExecutorServiceimplementations in this simple Callable Future example. 1. JavaCallableandFutureInterfaces 1.1. Callable InJava concurrency,Callablerepresents a task that returns a result.Execut...
importjava.util.concurrent.CountDownLatch;publicclassCountDownLatchExample{publicstaticvoidmain(String[]...
Runnablewas introduced in java 1.0 version While Callable is an extended version of Runnable and introduced in java 1.5 to address the limitation of Runnable. Runnable does not return any value; its return type is void, while Callable have a return type.So, after completion of task, we can ...
Example #2Source File: CachingArtifactResolvingHelper.java From thorntail with Apache License 2.0 6 votes private Set<ArtifactSpec> resolveInParallel(Collection<ArtifactSpec> toResolve) throws InterruptedException { ExecutorService threadPool = Executors.newFixedThreadPool(Runtime.getRuntime()....
【Thinking in Java】Java Callable的使用 Callable<>和Runable类似,都是用于Java的并发执行。 唯一的区别是,Runable的run方法的返回是void,而Callable的call方法是有返回值的。 call方法返回的类型是实现Callable<?>泛型接口时所指定的类型,不然会编译出错。
importcom.google.common.base.Stopwatch;importjava.util.ArrayList;importjava.util.List;importjava.util...
Java并发编程:Callable、Future和FutureTask在前面的文章中我们讲述了创建线程的2种方式,一种是直接继承Thread,另外一种就是实现Runnable接口。这2种方式都有一个缺陷就是:在执行完任务之后无法获取执行结果。如果需要获取执行结果,就必须通过共享变量或者使用线程通信的方式来达到效果,这样使用起来就比较麻烦。而自从Java ...
Exceptioninthread"main"java.util.concurrent.CancellationException at java.util.concurrent.FutureTask.report(FutureTask.java:121) at java.util.concurrent.FutureTask.get(FutureTask.java:192) atFutureCancelExample.main(FutureCancelExample.java:34) 如果你运行上面的程序,它会抛出一个异常,因为如果任务被取消,futu...