A semaphore : Semaphore « Threads « Java

1. Java
2. Threads
3. Semaphore

A semaphore

  
import java.util.concurrent.Semaphore;

public class Main {
  public static void main(String args[]) throws Exception {
    Semaphore sem = new Semaphore(1, true);
    Thread thrdA = new Thread(new SyncOutput(sem, "Message 1"));
    Thread thrdB = new Thread(new SyncOutput(sem, "Message 2!"));

    thrdA.start();
    thrdB.start();

    thrdA.join();
    thrdB.join();

  }
}

class SyncOutput implements Runnable {
  Semaphore sem;
  String msg;
  SyncOutput(Semaphore s, String m) {
    sem = s;
    msg = m;
  }

  public void run() {
    try {
      sem.acquire();
      System.out.println(msg);
      Thread.sleep(10);
    } catch (Exception exc) {
      System.out.println("Error Writing File");
    }
    sem.release();
  }
}

   
    
  

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