<?php
// Example of using Semaphore in Java
import java.util.concurrent.Semaphore;
public class SemaphoreExample {
private static final Semaphore semaphore = new Semaphore(1); // Allows one thread at a time
public static void main(String[] args) {
Thread thread1 = new Thread(new Task(), "Thread 1");
Thread thread2 = new Thread(new Task(), "Thread 2");
thread1.start();
thread2.start();
}
static class Task implements Runnable {
public void run() {
try {
// Acquire the semaphore
semaphore.acquire();
System.out.println(Thread.currentThread().getName() + " is running.");
Thread.sleep(2000); // Simulate work
System.out.println(Thread.currentThread().getName() + " is done.");
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} finally {
// Release the semaphore
semaphore.release();
}
}
}
}
?>
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