Please Follow The Instructions Of The Professor And Use The
Please Follow The Instruction Of The Proffessor And Use The Main Meth
Please Follow the instruction of the professor and use the main method given by the professor and try to give the same output as the professor.
Writing programs that solve the programming projects helps to solidify understanding of the material and demonstrates how chapter concepts are applied.
The assignment includes the following tasks:
1. Write a method for the Queue class in the queue.java program (Listing 4.4) that displays the contents of the queue from the first inserted item to the last, not simply showing the underlying array. The display should handle cases where the queue is empty or has wrapped around, showing the actual sequence in order.
2. Create a Deque class based on the chapter discussion. It should include insertLeft(), insertRight(), removeLeft(), removeRight(), isEmpty(), and isFull() methods. Supports wraparound at the end of the array, similar to queues.
3. Write a program that implements a stack class based on the Deque class created in task 2, matching the methods and capabilities of the StackX class in stack.java (Listing 4.1).
4. Rewrite the priority queue shown in Listing 4.6 to have O(1) insertion time but slower removal of the high-priority item. Implement a method to display the contents.
5. Write a simulation program modeling supermarket checkout lines using the Queue class from queue.java. Show multiple lines, allow adding customers, and simulate processing time by user input, as described.
The main functions provided in the sample code demonstrate the typical structure for user interaction. Ensure your solutions follow the same structure, use input prompts similar to those shown, and produce output in the same format to match the professor's expectations.
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Paper For Above instruction
Introduction
Programming projects are vital in mastering programming concepts by applying theoretical knowledge to practical scenarios. This paper addresses several programming tasks based on Chapter 4 materials, primarily focusing on queue, deque, stack, and priority queue implementations, along with simulation modeling of supermarket checkout lines. Adherence to the main method and output conventions demonstrated by the professor's examples is emphasized to ensure consistency and comprehension.
Task 1: Display Method for Queue Class
The first task involves enhancing the Queue class to include a display method that presents the queue's contents from front to rear, regardless of wraparound in the underlying array. In a typical queue implementation using arrays, front and rear indices may wrap around when they reach the end. A robust display method must traverse the queue in order, starting at the front and moving through the elements to the rear, considering possible wraparound cases.
This can be implemented by calculating the number of elements in the queue, then iterating from front through either linear or wrapped-around indices, printing each element without exposing the underlying array's structure. Handling empty queues involves displaying a message indicating no items, while wrapping scenarios require modular arithmetic to accurately traverse the structure.
Task 2: Deque Class Design
The second task entails creating a Deque (double-ended queue) class supporting insertions and removals at both ends. This class must support wraparound at the array's bounds, similar to a circular buffer. Methods include insertLeft(), insertRight(), removeLeft(), removeRight(), isEmpty(), and isFull().
Implementation considerations involve managing two indices, front and rear, updating them upon insertions and removals, and ensuring correct operation under wraparound conditions. For example, insertLeft() decreases the front index (wrapping if necessary), while insertRight() increases the rear index. Removal methods adjust the corresponding indices accordingly. Empty and full conditions depend on the relative positions of front and rear, which can be checked with specific logic.
Task 3: Stack Implementation Using Deque
The third task requires developing a stack class based on the Deque class from Task 2. The stack should support push() and pop() operations, akin to the StackX class in Listing 4.1. Since a stack operates on a Last-In-First-Out basis, the Deque can be used by consistently inserting and removing at one end (e.g., insertRight() and removeRight()) to emulate stack behavior.
This design simplifies stack implementation by leveraging the deque's flexibility. The push() method calls insertRight(), and the pop() method calls removeRight(). Additional methods include isEmpty() and isFull(), which mirror the deque's counterparts, facilitating robust stack operations.
Task 4: Priority Queue with O(1) Insertion
The fourth task revises the priority queue to achieve constant-time insertion while accommodating slower removal of the highest-priority item. This can be implemented using an auxiliary data structure, such as a separate reference to the highest-priority item, or by maintaining an unordered array with quick insertion.
For example, inserting an element involves appending it to an array, updating the reference to the highest priority if necessary. Removing the highest-priority item involves traversing the array to find and remove it, which is slower. Additionally, a display method should iterate over the internal structure, printing all items.
Task 5: Simulation of Supermarket Checkout Lines
The fifth task involves modeling checkout lines using the Queue class. Multiple lines are maintained, with the user able to add customers to a line based on criteria such as shortest queue or random choice. Several customers are displayed at each step, along with their queue contents.
Simulation proceeds by user input: pressing a key advances time, with checkers processing customers (processing times randomized). Customers are removed upon checkout completion, and new customers can join lines. The display method helps visualize the current state of each queue, providing insights into customer flow and efficiency.
Conclusion
Following the main method and output conventions outlined by the professor ensures clarity and comparability of results. The exercises deepen understanding of data structure implementation and simulation modeling, critical to advancing programming proficiency. Accurate replication of examples and method usage solidifies skills necessary for complex software development tasks.
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