What is difference between submit () and execute () in Java?

What is the difference between submit and execute in Java?

The difference is that execute simply starts the task without any further ado, whereas submit returns a Future object to manage the task. You can do the following things with the Future object: The Future interface is more useful if you submit a Callable to the pool.

What is the difference between the submit () and execute () method thread pool in Java?

In this article, we will see the difference between the two such methods called execute() and submit(). In Java, in order to perform asynchronous tasks, the runnable interface is implemented.

Output:

Execute Method Submit Method
This method has a return type of void. This method has a return type of Future.

What is the difference between submit () and execute () method of executor and ExecutorService in Java?

Main differences between the two methods: The execute() method is declared in Executor interface while submit() method is declared in ExecutorService interface. The submit() method can accept both Runnable as well as Callable tasks, but execute() method can only accept a Runnable Task.

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What is the difference between executor and ExecutorService?

1 Answer. Executor just executes stuff you give it. ExecutorService adds startup, shutdown, and the ability to wait for and look at the status of jobs you’ve submitted for execution on top of Executor (which it extends).

What is deadlock in Java?

Deadlock describes a situation where two or more threads are blocked forever, waiting for each other. … A Java multithreaded program may suffer from the deadlock condition because the synchronized keyword causes the executing thread to block while waiting for the lock, or monitor, associated with the specified object.

What is ScheduledExecutorService in Java?

The java. util. concurrent. ScheduledExecutorService is an ExecutorService which can schedule tasks to run after a delay, or to execute repeatedly with a fixed interval of time in between each execution.

What is Executor in Java?

An object that executes submitted Runnable tasks. This interface provides a way of decoupling task submission from the mechanics of how each task will be run, including details of thread use, scheduling, etc. An Executor is normally used instead of explicitly creating threads.

What is future get in Java?

As mentioned earlier, a Java Future represents the result of an asynchronous task. To obtain the result, you call one of the two get() methods on the Future . The get() methods both return an Object , but the return type can also be a generic return type (meaning an object of a specific class, and not just an Object ).

What is a fork join pool?

ForkJoinPool

It is an implementation of the ExecutorService that manages worker threads and provides us with tools to get information about the thread pool state and performance. Worker threads can execute only one task at a time, but the ForkJoinPool doesn’t create a separate thread for every single subtask.

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Do we need to shutdown ExecutorService?

When finished using an ExecutorService , you need to shut it down explicitly. From its javadoc: “An unused ExecutorService should be shut down to allow reclamation of its resources.” Calling shutdown initiates a gradual and orderly shutdown.

How do I create an ExecutorService in Java?

A simple program of Java ExecutorService

  1. public class ExecutorServiceExample {
  2. public static void main(String[] args) {
  3. ExecutorService executorService = Executors.newFixedThreadPool(10);
  4. executorService.execute(new Runnable() {
  5. @Override.
  6. public void run() {
  7. System.out.println(“ExecutorService”);
  8. }

What is callable in Java?

The Java Callable interface, java. … Callable , represents an asynchronous task which can be executed by a separate thread. For instance, it is possible to submit a Callable object to a Java ExecutorService which will then execute it asynchronously.

What is executor and ExecutorService in Java?

1)Executor just executes stuff you give it. ExecutorService adds startup, shutdown, and the ability to wait for and look at the status of jobs you’ve submitted for execution on top of Executor (which it extends).

Who is called an executor?

An executor is a person/institution who is the legal representative, named in a will or implied as such, to carry out the process of the distribution of the assets of the testator.