web-study/java/samples/FutureExample.java at master · iTasks/web-study

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import java.util.concurrent.*;

import java.util.concurrent.Callable;

class FactorialTask implements Callable<Long> {

private int number;

public FactorialTask(int number) {

this.number = number;

}

@Override

public Long call() throws Exception {

return factorial(number);

}

private long factorial(int n) {

long result = 1;

for (int i = 2; i <= n; i++) {

result *= i;

}

return result;

}

public class FutureExample {

public static void main(String[] args) {

ExecutorService executor = Executors.newSingleThreadExecutor();

FactorialTask task = new FactorialTask(5);

Future<Long> future = executor.submit(task);

try {

// You can do other tasks here in the meantime

// This will block until the future's task completes

Long result = future.get(); // You can also use future.get(timeout, TimeUnit.SECONDS) to timeout

System.out.println("Factorial of 5 is: " + result);

} catch (InterruptedException e) {

// handle the case where the task was interrupted during processing

Thread.currentThread().interrupt();

System.err.println("Task was interrupted");

} catch (ExecutionException e) {

// handle the case where the task threw an exception

System.err.println("Error occurred: " + e.getCause());

} finally {

// It's important to shutdown your executor service!

executor.shutdown();

}

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