📚 Queue Class Overview

🎯 How It Works

🧱 Node Structure:

Each Node contains:

• A value (val) of type Object.
• A reference to the next node (next).

🧩 Attributes:

• head: Points to the front of the queue.
• tail: Points to the end of the queue.

🛠️ Methods:

• enqueue(Object v)

  Adds a new element to the end of the queue.

  Updates the tail reference.

• dequeue()

  Removes and returns the front element of the queue.

  Updates the head reference.

  Throws a RuntimeException if the queue is empty.

• peek()

  Returns the front element without removing it.

  Throws a RuntimeException if the queue is empty.

• isEmpty()

  Returns true if the queue is empty, otherwise false.

🏷️ Where It Is Implemented

The Queue class is used in src/expensetracker/Main.java to manage recent actions performed by the user.