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可返回值的任务必须实现Callable接口，类似的，无返回值的任务必须Runnable接口。

执行Callable任务后，可以获取一个Future的对象，在该对象上调用get就可以获取到Callable任务返回的Object了。

package thread.callable;import java.util.concurrent.ExecutionException;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.Future;/** * Callable和Future * 
 * 1.可返回值的任务必须[实现Callable接口]，类似的，无返回值的任务必须[Runnable接口] * 2.执行Callable任务后，可以获取一个[Future的对象]，在该对象上调用get就可以获取到Callable任务返回的Object了。 * 
 * Created by heqianqian on 2017/4/15. */public class CallableDemo {
       public static void main(String[] args) throws ExecutionException, InterruptedException {        ExecutorService pool = Executors.newFixedThreadPool(2);        Future future1 = pool.submit(new MyCallable("A"));        Future future2 = pool.submit(new MyCallable("B"));        System.out.println(future1.get().toString());        System.out.println(future2.get().toString());        pool.shutdown();    }}

package thread.callable;import java.util.concurrent.Callable;/** * MyCallable * Created by heqianqian on 2017/4/15. */public class MyCallable implements Callable {
       private String name;    public MyCallable(String name) {        this.name = name;    }    @Override    public Object call() throws Exception {        return name + "返回的内容";    }}

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