Java Concurrency - Executor Interface

Quiz

A java.util.concurrent.Executor interface is a simple interface to support launching new tasks.

ExecutorService Methods

Sr.No.	Method & Description
1	void execute(Runnable command) Executes the given command at some time in the future.

Example

The following TestThread program shows usage of Executor interface in thread based environment.

import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class TestThread {

   public static void main(final String[] arguments) throws InterruptedException {
      Executor executor = Executors.newCachedThreadPool();
      executor.execute(new Task());
      ThreadPoolExecutor pool = (ThreadPoolExecutor)executor;
      pool.shutdown();
   }  

   static class Task implements Runnable {
      
      public void run() {
         
         try {
            Long duration = (long) (Math.random() * 5);
            System.out.println("Running Task!");
            TimeUnit.SECONDS.sleep(duration);
            System.out.println("Task Completed");
         } catch (InterruptedException e) {
            e.printStackTrace();
         }
      }
   }
}

This will produce the following result.

Output

Running Task!
Task Completed

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