Java 5.0 在 java.util.concurrent 提供了一个新的创建执行线程的方式:Callable 接口
Callable 接口类似于 Runnable,两者都是为那些其实例可能被另一个线程执行的类设计的。但是 Runnable 不会返回结果,并且无法抛出经过检查的异常。
Callable 需要依赖FutureTask ,FutureTask 也可以用作闭锁。
例子:
package com.company; import java.util.concurrent.Callable; import java.util.concurrent.ExecutionException; import java.util.concurrent.FutureTask; /** * Created by MSI1 on 2017/3/30. */ public class TestCallableDemo { public static void main(String[] args) { try { DemoThread demoThread = new DemoThread(); FutureTask<Integer> integerFutureTask = new FutureTask<>(demoThread); new Thread(integerFutureTask).start(); Integer result = integerFutureTask.get(); System.out.println("result = " + result); } catch (InterruptedException e) { e.printStackTrace(); } catch (ExecutionException e) { e.printStackTrace(); } } } class DemoThread implements Callable<Integer> { @Override public Integer call() throws Exception { int sum = 0; for (int i = 0; i <= 100; i++) { sum = sum + i; } return sum; } }
結果:
result = 5050