Executor, ExecutorService And Executors

Anshu Kulshrestha

1 min read

·

Jul 4, 2024

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Executor: The Executor interface has execute method which has void return type. and accepts Runnable interface

ExecutorService : This is an interface extending the Executor interface and is responsible for Thread Pool creation and management. The ExecutorService has submit method which returns future object and accepts callable/Runnable.

Executors: It is a class which provides factory methods to create different kind of thread pools

public class ExecutorServiceEx {
 public static void main(String[] args) {
  ExecutorService executorService = Executors.newFixedThreadPool(2);

  executorService.execute(new Runnable() {
   public void run() {
    for (int i = 0; i < 100; i++) {
     System.out.println("Asynchronous task 1"+" : "+ Thread.currentThread());
    }
   }
  });
  
  executorService.execute(new Runnable() {
   public void run() {
    for (int i = 0; i < 100; i++) {
     System.out.println("Asynchronous task 2" + " : "+ Thread.currentThread());
    }
   }
  });
  
  executorService.execute(new Runnable() {
   public void run() {
    for (int i = 0; i < 100; i++) {
     System.out.println("Asynchronous task 3" + " : "+ Thread.currentThread());
    }
   }
  });
  
  
  Future<?> submit = executorService.submit(new Runnable() {
   public void run() {
    for (int i = 0; i < 100; i++) {
     System.out.println("Asynchronous task 4" + " : "+ Thread.currentThread());
    }
   }
  });

  System.out.println(submit.isDone());
  executorService.shutdown();
 }
}