implements Callable interface and submit to ExecutorService - Java Thread

Java examples for Thread:ExecutorService

  1. HOME
  2. Java
  3. Thread
  4. ExecutorService

Description

implements Callable interface and submit to ExecutorService

Demo Code


import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.*;

public class MyCallable implements Callable<String> {
    public static void main(String args[]) {
        //Get ExecutorService from Executors utility class, thread pool size is 10
        ExecutorService executor = Executors.newFixedThreadPool(2);
        //create a list to hold the Future object associated with Callable
        List<Future<String>> list = new ArrayList<Future<String>>();
        //Create MyCallable instance
        Callable<String> callable = new MyCallable();
        for (int i = 0; i < 5; i++) {
            //submit Callable tasks to be executed by thread pool
            Future<String> future = executor.submit(callable);
            //add Future to the list, we can get return value using Future
            list.add(future);//from  w w w  .  ja va 2 s .c o m
        }
        for (Future<String> fut : list) {
            try {
                //print the return value of Future, notice the output delay in console
                // because Future.get() waits for task to get completed
                System.out.println(new Date() + "::" + fut.get());
            } catch (InterruptedException | ExecutionException e) {
                e.printStackTrace();
            }
        }
        //shut down the executor service now
        executor.shutdown();
        // No threads can be execute further
    }

    @Override
    public String call() throws Exception {
        Thread.sleep(1000);
        //return the thread name executing this callable task
        return Thread.currentThread().getName();

    }
}

Related Tutorials