diff --git a/scala_project_2025/bank_system/src/main/scala/Transaction.scala b/scala_project_2025/bank_system/src/main/scala/Transaction.scala
index d959748..5b20b52 100644
--- a/scala_project_2025/bank_system/src/main/scala/Transaction.scala
+++ b/scala_project_2025/bank_system/src/main/scala/Transaction.scala
@@ -1,24 +1,22 @@
+import java.util.concurrent.ConcurrentLinkedQueue
+import scala.collection.JavaConverters._
+
 object TransactionStatus extends Enumeration {
   val SUCCESS, PENDING, FAILED = Value
 }
 
 class TransactionPool {
+  private val queue = new ConcurrentLinkedQueue[Transaction]()
 
-  // Remove and the transaction from the pool
-  def remove(t: Transaction): Boolean = ???
+  def add(t: Transaction): Boolean = queue.offer(t)
 
-  // Return whether the queue is empty
-  def isEmpty: Boolean = ???
+  def remove(t: Transaction): Boolean = queue.remove(t)
 
-  // Return the size of the pool
-  def size: Integer = ???
+  def isEmpty: Boolean = queue.isEmpty
 
-  // Add new element to the back of the queue
-  def add(t: Transaction): Boolean = ???
-
-  // Return an iterator to allow you to iterate over the queue
-  def iterator: Iterator[Transaction] = ???
+  def size: Integer = queue.size
 
+  def iterator: Iterator[Transaction] = queue.iterator.asScala
 }
 
 class Transaction(