Examples of problems caused by High concurrency in java

This article will explain in detail the examples of problems caused by high concurrency in java. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

The example simulates 10000 requests with a concurrent number of 100. for each request, the counter is added by 1, and the counter value is finally output.

The above code:

Package concurrent;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.Semaphore;/** * @ Description: concurrent testing * / public class ConcurrentSample {/ / number of concurrent threads private static int users = 100; / / visits private static int count = 10000; / / Total access private static int number = 0 Public static void main (String [] args) {/ / define thread pool ExecutorService executorService = Executors.newCachedThreadPool (); / / concurrency Semaphore semaphore = new Semaphore (users); for (int I = 0; I

< count; i++) { executorService.execute(() ->

{try {semaphore.acquire (); add (); semaphore.release ();} catch (Exception e) {e.printStackTrace ();}});} try {Thread.sleep (3000) } catch (Exception e) {e.printStackTrace ();} executorService.shutdown (); System.out.println (number);} public static void add () {number++;}}

Counter: 9997

Counter: 10000

Counter: 9997

Every time the output is inconsistent, it is caused by concurrency.

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