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  1. import java.util.concurrent.locks.ReentrantLock;
  2.  
  3. public class Program {
  4.  
  5.     public static void main(String[] args) {
  6.  
  7.         CommonResource commonResource= new CommonResource();
  8.         ReentrantLock locker = new ReentrantLock(); // создаем заглушку
  9.         for (int i = 1; i < 6; i++){
  10.  
  11.             Thread t = new Thread(new CountThread(commonResource, locker));
  12.             t.setName("Thread "+ i);
  13.             t.start();
  14.         }
  15.     }
  16. }
  17.  
  18. class CommonResource{
  19.  
  20.     int x=0;
  21. }
  22.  
  23. class CountThread implements Runnable{
  24.  
  25.     CommonResource res;
  26.     ReentrantLock locker;
  27.     CountThread(CommonResource res, ReentrantLock lock){
  28.         this.res=res;
  29.         locker = lock;
  30.     }
  31.     public void run(){
  32.  
  33.         locker.lock(); // устанавливаем блокировку
  34.         try{
  35.             res.x=1;
  36.             for (int i = 1; i < 5; i++){
  37.                 System.out.printf("%s %d \n", Thread.currentThread().getName(), res.x);
  38.                 res.x++;
  39.                 Thread.sleep(100);
  40.             }
  41.         }
  42.         catch(InterruptedException e){
  43.             System.out.println(e.getMessage());
  44.         }
  45.         finally{
  46.             locker.unlock(); // снимаем блокировку
  47.         }
  48.     }
  49. }
Compilation error #stdin compilation error #stdout 0s 0KB
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Standard input is empty
compilation info 
Main.java:3: error: class Program is public, should be declared in a file named Program.java
public class Program {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/Kl1JJ9
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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