Solve task

src/main/java/mate/academy/TicketBookingSystem.java

@@ -1,12 +1,37 @@
 package mate.academy;
 
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
 public class TicketBookingSystem {
+    private final Semaphore semaphore;
+    private int totalSeats;
+    private final Lock lock;
 
     public TicketBookingSystem(int totalSeats) {
-
+        this.totalSeats = totalSeats;
+        this.semaphore = new Semaphore(totalSeats);
+        this.lock = new ReentrantLock();
     }
 
     public BookingResult attemptBooking(String user) {
-        return null;
+        BookingResult bookingResult;
+        lock.lock();
+        try {
+            semaphore.acquire();
+            if (totalSeats > 0) {
+                bookingResult = new BookingResult(user, true, "Booking successful.");
+                totalSeats--;
+            } else {
+                bookingResult = new BookingResult(user, false, "No seats available.");
+            }
+            semaphore.release();
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        } finally {
+            lock.unlock();
+        }
+        return bookingResult;
     }
 }