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  1.  
  2. import java.util.Random;
  3. import java.util.concurrent.atomic.AtomicBoolean;
  4.  
  5. public class Main {
  6.     public static void main(String[] args) {
  7.         final AtomicBoolean flag = new AtomicBoolean(false);
  8.  
  9.         final Thread[] runners = new Thread[5];
  10.  
  11.         final Random random = new Random();
  12.  
  13.         for (int i = 0 ; i < runners.length; i++){
  14.             runners[i] = new Thread("Runner # " + i){
  15.                 @Override
  16.                 public void run() {
  17.                     try {
  18.                         // wait for random time
  19.                         Thread.sleep(1000 + random.nextInt(1000));
  20.  
  21.                         // try to claim the flag
  22.                         boolean claimed = flag.compareAndSet(false,true);
  23.  
  24.                         if(claimed){
  25.                             System.out.println(this.getName() + " has won the race.");
  26.  
  27.                             // interrupt others
  28.                             for (Thread t : runners){
  29.                                 if(!t.equals(this)){
  30.                                     t.interrupt();
  31.                                 }
  32.                             }
  33.                         }else {
  34.                             System.out.println(this.getName() + " has very closely lost the race.");
  35.                         }
  36.  
  37.                     } catch (InterruptedException e) {
  38.                         System.out.println(this.getName() + " has lost the race.");
  39.                     }
  40.                 }
  41.             };
  42.         }
  43.  
  44.         // get set go
  45.         for (int i = 0 ; i < runners.length; i++){
  46.             runners[i].start();
  47.         }
  48.     }
  49. }
Success #stdin #stdout 0.08s 381824KB
comments (?)
stdin 
Standard input is empty
stdout 
Runner # 1 has won the race.
Runner # 0 has lost the race.
Runner # 2 has lost the race.
Runner # 4 has lost the race.
Runner # 3 has lost the race.
https://ideone.com/1F3bkH
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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