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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.concurrent.*;
  4. import java.util.concurrent.locks.ReentrantLock;
  5.  
  6. /* Name of the class has to be "Main" only if the class is public. */
  7. class Ideone
  8. {
  9. static class DemoClass {
  10.     public int count =0;
  11.     public ReentrantLock lock = new ReentrantLock();
  12.     public void increment() {
  13.         lock.lock();
  14.         try {
  15.             count++;
  16.         } finally {
  17.             lock.unlock();
  18.         }
  19.     }
  20. }
  21.  
  22.     public static void main(String[] args) throws InterruptedException {
  23.         ExecutorService executor = Executors.newFixedThreadPool(2);
  24.         DemoClass demoClass = new DemoClass();
  25.         int i=0;
  26.         for(;i<=10000;i++) {
  27.             executor.submit(demoClass::increment);
  28.         }
  29.  
  30.         executor.shutdown();
  31.         executor.awaitTermination(2, TimeUnit.SECONDS);
  32.  
  33.         demoClass.lock.lock();
  34.         try {
  35.         	System.out.println( demoClass.count);  // 10000
  36.         } finally {
  37.             demoClass.lock.unlock();
  38.         }
  39.     }
  40. }
Success #stdin #stdout 0.15s 56920KB
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https://ideone.com/im8BVB
language:
Java (12.0.1)
created:
4 years ago
visibility:
public

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