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To return a value from a thread involves these steps: 1 Create a class that implements the Callable interface This interface defines only one method, call( ) The value returned by call( ) becomes the value returned by the thread 2 Obtain an ExecutorService by using one of the factory methods defined by the Executors class The executor will be used to execute an instance of the Callable created in Step 1 3 Create an instance of Future that will receive the value returned by the Callable after it has returned 4 Execute the Callable by passing it to the submit( ) method defined by the ExecutorService The value returned by submit( ) is assigned to the Future 5 Obtain the value returned by the thread by calling get( ) on the Future returned by submit( ) 6 When you are done with the ExecutorService, terminate it by calling shutdown( )
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Callable is a generic interface that is defined like this: interface Callable<V> Here, V indicates the type of data returned by the task Callable defines only one method, call( ), which is shown here: V call( ) throws Exception Inside call( ), you define the task that you want performed After that task completes, you return the result If the result cannot be computed, call( ) must throw an exception A Callable task is executed by an instance of ExecutorService An ExecutorService is obtained by calling one of the factory methods defined by the Executors class The one used by this recipe is newFixedThreadPool( ), shown here: static ExecutorService newFixedThreadPool(int num) This creates an executor service that uses a pool of threads to execute tasks The number of threads in the pool is fixed However, a thread can be reused In other words, when a thread completes a task, it can be used for another Reusing threads is more efficient than creating many separate threads
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Given an executor service, a Callable task is executed by calling the executor s submit( ) method There are three forms of submit( ), but only one is used to execute a Callable It is shown here: <T> Future<T> submit(Callable<T> task) Here, task is the Callable object that will be executed in its own thread The result is returned through an object of type Future Future is a generic interface that represents the value that will be returned by a Callable object Because this value is obtained at some future time, the name Future is appropriate Future is defined like this: interface Future<V> Here, V specifies the type of the result To obtain the returned value, you will call Future s get( ) method, which has two forms The one used by this recipe is shown here: V get( ) throws InterruptedException, ExecutionException This method will wait for the result indefinitely Thus, it will not return until the result is available When you are done with the ExecutorService, you should terminate it by calling shutdown( ) on it This method is shown here: void shutdown( ) This method allows all threads currently under the control of the invoking ExecutorService to complete and then stops the executor service After the call to shutdown( ) no new threads can be executed
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The following program shows how to return a value from a thread It creates three Callable threads The first averages an array of doubles The second computes the factorial of an integer The third writes a string to a file and returns true if successful and false otherwise All three actions occur concurrently because each runs in its own thread
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// // // // // // // Return a value from a thread This program creates three Callable threads The first averages an array of doubles The second computes the factorial of an integer The third writes a string to a file It returns true if successful and false otherwise
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import javautilconcurrent*; import javaio*; class ThrdRetValDemo { public static void main(String args[]) { ExecutorService es = ExecutorsnewFixedThreadPool(3);
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