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  1. package org.sample;
  2.  
  3. import java.util.concurrent.ExecutorService;
  4. import java.util.concurrent.Executors;
  5.  
  6. class A {
  7.  
  8.     Object o = new Object();
  9.  
  10.     public void hello(String holderName) {
  11.         synchronized (o) {
  12.             for (int i = 0; i < 10; i++) {
  13.                 System.out.println("hello " + holderName);
  14.                 try {
  15.                     Thread.sleep(1000);
  16.                 } catch (InterruptedException e) {
  17.                     throw new RuntimeException(e);
  18.                 }
  19.             }
  20.         }
  21.     }
  22.  
  23. }
  24.  
  25. class B implements Runnable {
  26.     private A a;
  27.     private String name;
  28.  
  29.     public A getA() {
  30.         return a;
  31.     }
  32.  
  33.  
  34.     public B(A a, String name) {
  35.         this.a = a;
  36.         this.name = name;
  37.     }
  38.  
  39.     @Override
  40.     public void run() {
  41.         a.hello(name);
  42.     }
  43. }
  44.  
  45.  
  46. public class Main {
  47.     public static void main(String[] args) throws InterruptedException {
  48.         A a = new A();
  49.         B b1 = new B(a, "b1");
  50.         B b2 = new B(a, "b2");
  51.  
  52.         ExecutorService executorService = Executors.newCachedThreadPool();
  53.         executorService.submit(b1);
  54.         Thread.sleep(1000);
  55.         a.o = new Object();
  56.         executorService.submit(b2);
  57.     }
  58. }
Runtime error #stdin #stdout #stderr 0.12s 320768KB
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Standard input is empty
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Standard output is empty
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Error: Could not find or load main class Main
https://ideone.com/zrJrYF
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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