Submit Callable object to ExecutorService - Java Thread

Java examples for Thread:ExecutorService

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Description

Submit Callable object to ExecutorService

Demo Code


import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class SimpleMain {
  public static void main(String[] args) {
    ExecutorService executor = Executors.newSingleThreadExecutor();
    Callable<String> callable = new CallableDemo();
    // Thread will start automatically after submittion
    Future<String> future = executor.submit(callable);
    System.out.println("Thread Submitted");
    try {//from w  ww .  j  a  va  2 s  .c  o  m
      Thread.sleep(3000);
      System.out.println("Waiting For Response");
      executor.shutdown();
      System.out.println("Response:" + future.get());
      // you can get response multiple time but thread will execute only
      // once
      System.out.println("Response:" + future.get());
      // System.out.println(future.get());
    } catch (InterruptedException | ExecutionException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    executor.shutdown();
    try {
      Thread.sleep(3000);
      System.out.println("Waiting For Response");
      System.out.println("Response:" + future.get());
      // you can get response multiple time but thread will execute only
      // once
      System.out.println("Response:" + future.get());
      // System.out.println(future.get());
    } catch (InterruptedException | ExecutionException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
}

class CallableDemo implements Callable<String> {
  @Override
  public String call() throws Exception {
    for (int i = 0; i < 10; i++) {
      Thread.sleep(1000);
      System.out.println("I :" + i);
    }
    return Thread.currentThread().getName();
  }
}

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