Question

Java   Project -  Queue ADT

Problem Statement and Assignment:
Design an inventory class that stores the following members
serialNum: an integer that holds a part’s serial number
manufactDate: a member that holds the date the part was manufactured
lotNum: an integer that holds the part’s lot number

The class should have appropriate member functions (interfaces) for storing data into, and retrieving data from, these members.  
Then, design a program that uses the queue class.  The type of the queue should be the above inventory.  The program should have a loop that asks the user whether he or she wishes to add a part to inventory or take a part from inventory.  The loop should repeat until the user is finished.

If the user wishes to add a part to inventory, the program should ask for the serial number, date of manufacture, and lot number.  The information should be stored in an inventory object using inventory interfaces and added into the inventory queue.

If the user wishes to take a part from inventory, the program should remove the front part from the queue and display the contents of its member variables.

When the user finishes, the program should display the contents of the member values of all the objects that remain in the queue.

Answer 1

package com.HomeworkLib1;

import java.util.Scanner;

class Inventory {
   PartsQueue inventoryQueue = new PartsQueue();

   public void addPartsToInventory(Parts item) {
       GenericNode node = new GenericNode(item);
       inventoryQueue.enqueue(node);
   }
  
   public Parts takePartsFromInventory() {
       return inventoryQueue.dequeue().data;
   }
  
   public void diplaayInventoryDetails() {
       inventoryQueue.printQueue();
   }

   public static void main(String[] args) {
       // TODO Auto-generated method stub
       Inventory inventory = new Inventory();
       Scanner console = new Scanner(System.in);
       // Add task
       boolean breakLoop = false;
       while(!breakLoop) {
           //Menu display
           System.out.println("Menu");
           System.out.println("1 Add parts to Inventory");
           System.out.println("2 Take parts from Queue");
           System.out.println("3 Display inventory details");
           System.out.println("4 Quit");
           System.out.print("Enter option: ");
          
           int option = console.nextInt();
          
           switch(option) {
           //Add employee to queue
           case 1:
               //Read Inventory details
               System.out.print("\nEnter Serial number:");
               int serialNum = console.nextInt();
              
               System.out.print("\nEnter date of manufacturing: ");
               String date = console.next();
               System.out.print("\nEnter lot number : ");
               int lotNo = console.nextInt();
               //Create Inventory object
               Parts part = new Parts(serialNum, date, lotNo);
              
               //Add to queue
               inventory.addPartsToInventory(part);
              
               break;
           case 2:
               //Remove from queue
               Parts removedPart = inventory.takePartsFromInventory();
               //Display detail
               System.out.println("Removed parts details from inventory: ");
               System.out.println(removedPart.toString());
               break;
           case 3:
               inventory.diplaayInventoryDetails();
               break;
           case 4:
               breakLoop = true;
               break;
           default:
               System.out.println("Wrong input");
           }
       }
   }
}
---------------------
package com.HomeworkLib1;

import java.util.Scanner;

class GenericNode {
   GenericNode next;
   Parts data;

   public GenericNode(Parts data) {
       this.data = data;
   }

}

class Parts {
   int serialNum;
   String manufactDate;
   int lotNum;

   /**
   * @param serialNum
   * @param manufactDate
   * @param lotNum
   */
   public Parts(int serialNum, String manufactDate, int lotNum) {
       super();
       this.serialNum = serialNum;
       this.manufactDate = manufactDate;
       this.lotNum = lotNum;
   }

   /*
   * (non-Javadoc)
   *
   * @see java.lang.Object#toString()
   */
   @Override
   public String toString() {
       return "Parts [serialNum=" + serialNum + ", "
               + (manufactDate != null ? "manufactDate=" + manufactDate + ", " : "") + "lotNum=" + lotNum + "]";
   }

}

public class PartsQueue {

   // Front and Rear Pointers to to point start and end of queue
   GenericNode front;
   GenericNode rear;
   double cost;

   // Enqueue methods
   void enqueue(GenericNode node) {

       // Create a new LL GenericNode
       GenericNode temp = node;

       // If queue is empty, then new GenericNode is front and rear both
       if (this.rear == null) {
           this.front = this.rear = temp;
           return;
       }

       // Add the new GenericNode at the end of queue and change rear
       this.rear.next = temp;
       this.rear = temp;
   }

   GenericNode dequeue() {
       // If queue is empty, return NULL.
       if (this.front == null)
           return null;

       // Store previous front and move front one GenericNode ahead
       GenericNode temp = this.front;
       this.front = this.front.next;

       // If front becomes NULL, then change rear also as NULL
       if (this.front == null)
           this.rear = null;
       return temp;
   }

   // Print queue method
   void printQueue() {
       GenericNode temp = front;
       while (temp != null) {
           System.out.println(temp.data.toString());
           temp = temp.next;
       }
   }

}
-------------------
Output
Menu
1 Add parts to Inventory
2 Take parts from Queue
3 Display inventory details
4 Quit
Enter option: 1

Enter Serial number:1000

Enter date of manufacturing: 12/12/2018

Enter lot number : 2000
Menu
1 Add parts to Inventory
2 Take parts from Queue
3 Display inventory details
4 Quit
Enter option: 1

Enter Serial number:1001

Enter date of manufacturing: 13/12/2018

Enter lot number : 2001
Menu
1 Add parts to Inventory
2 Take parts from Queue
3 Display inventory details
4 Quit
Enter option: 1

Enter Serial number:1002

Enter date of manufacturing: 14/12/2018

Enter lot number : 2003
Menu
1 Add parts to Inventory
2 Take parts from Queue
3 Display inventory details
4 Quit
Enter option: 2
Removed parts details from inventory:
Parts [serialNum=1000, manufactDate=12/12/2018, lotNum=2000]
Menu
1 Add parts to Inventory
2 Take parts from Queue
3 Display inventory details
4 Quit
Enter option: 1

Enter Serial number:1004

Enter date of manufacturing: 15/12/2018

Enter lot number : 2004
Menu
1 Add parts to Inventory
2 Take parts from Queue
3 Display inventory details
4 Quit
Enter option: 2
Removed parts details from inventory:
Parts [serialNum=1001, manufactDate=13/12/2018, lotNum=2001]
Menu
1 Add parts to Inventory
2 Take parts from Queue
3 Display inventory details
4 Quit
Enter option: 3
Parts [serialNum=1002, manufactDate=14/12/2018, lotNum=2003]
Parts [serialNum=1004, manufactDate=15/12/2018, lotNum=2004]
Menu
1 Add parts to Inventory
2 Take parts from Queue
3 Display inventory details
4 Quit
Enter option: 4