• Implement and test a TransactionManager class that manages objects that implement the PurchaseReceiptinterface in Java. These objects are Transaction objects and the objects of their derived classes.

• This is PurchaseReceipt.java or the Purchase Receipt interface package it313.proj4; public interface PurchaseReceipt extends Comparable { public int getId( ); public String getBuyer( ); public String getSeller( ); public double getAmount( ); }

• Deliverables: Cover document explaining what you implemented in your project, csource code files: Transaction.java, GoldTransaction.java, LumberTransaction.java, TransactionManager.java, Test3.java, generated Javadoc documentation.
• Details:
  1. Use this TransactionManager UML Diagram to help you implement the TransactionManager class..
  2. The TransactionManager contains one instance variable defined like this:

     private ArrayList _col; 

     This collection is instantiated in the TransactionManager constructor like this:

     _col = new ArrayList( ); 

  3. The specs of the TransactionManager methods:

     Method	Information	Parameter
     add	Append a PurchaseReceipt object to _col	PurchaseReceipt object
     clear	Clear out _col by removing all its objects.	None
     getCount	Return number of objects in _col	None
     getAll	Return array list of all objects sorted by _id	None
     findBuyer	Return array list of all objects from _col with specified buyer, sorted by _id.	Name of buyer (String)
     findSeller	Return array list of all objects from _col with specified seller, sorted by _id.	Name of buyer (String)
     findId	Return object with specified _id.	Id to find (int)
     save	Serialize transaction manager to file	None
     load	Deserialize transaction manager from file	None

  4. The Transaction and TransactionManager classes implement the Serializable interface so that it can be serialized to or deserialized from a .ser file.
  5. Write a traditional test class Test3 that tests your TransactionManager class.
  6. Optional: test your classes on using the CommandShell class.Change the name of the class file to CommandShell.java if necessary.
  7. Include Javadoc comments in each of your classes. When your project is finished, run the javadoc utility and copy the generated html files to a separate folder named javadoc in your project zipfile. Use Javadoc comments at the beginning of classes, constructors, and methods. Format of Javadoc comment before a class:

     /** * Short description of class * * @author Stan Smith * @version 1.6 9/26/17 */ public class MyClass { // class body } 

     Format of a Javadoc comment before a constructor or method:

     /** * Short one line description. * 
      * Longer description. If there were any, * it would be here. * 
      * And even more explanations to follow in * consecutive paragraphs separated by HTML * paragraph breaks. * 
      * @param parameter description. * @return return value description * @throws description of exceptions thrown */ public int methodName(...) { // method body } 

     Format of a Javadoc comment before a public field:

     /** * Description of variable here. */ public final int constantName = 1234; 

  Grading Breakdown: TransactionManager Functionality: 50, Test3: 25, Javadoc Comments and Eclipse generated documentation: 15, Indentation: 5, Submitted: 5. Deduction for not submitting cover document: -10. Extra Credit: up to 10 points extra credit for implementing the Command Shell.

This is the code for the Transaction class, GoldTransaction class, and the LumberTransaction class //The Transaction class implements the PurchaseReceipt interface, which inherits from the // Comparable interface. Test the compareTo method in the Transaction class to make sure that // its objects are compared correctly. public class Transaction implements PurchaseReceipt { private int _id; private String _buyer; private String _seller; private double _amount; private String _memo; private String _timestamp; public Transaction(int _id, String _buyer, String _seller, double _amount, String _memo, String _timestamp) { this._id = _id; this._buyer = _buyer; this._seller = _seller; this._amount = _amount; this._memo = _memo; this._timestamp = _timestamp; } public Transaction() { _id = 0; _buyer = ""; _seller = ""; _amount = 0.0; _memo = ""; _timestamp = ""; } public int getId() { return _id; } public String getBuyer() { return _buyer; } public String getSeller() { return _seller; } public double getAmount() { return _amount; } public String get_memo() { return _memo; } public String get_timestamp() { return _timestamp; } @Override public String toString() { return "ID: " + this.getId() + ", " + "Buyer: " + this.getBuyer() + ", " + "Seller: " + this.getSeller() + ", " + "Amount: $" + this.getAmount() + ", " + "Memo: " + this.get_memo() + ", " + "Timestamp: " + this.get_timestamp(); } //Implement the Comparable interface for the Transaction class so that the items in // the Project 4b TransactionManager collection can be sorted before being returned // by the various methods. This means that you must supply a compareTo method. @Override public int compareTo(PurchaseReceipt purchaseReceipt) { return (int) (this.getAmount() - purchaseReceipt.getAmount()); } } 

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public class GoldTransaction extends Transaction { public int _carats; public double _weight; public GoldTransaction() { super(); } public GoldTransaction(int _id, String _buyer, String _seller, double _amount, String _memo, String _timestamp, int _carats, double _weight) { super(_id, _buyer, _seller, _amount, _memo, _timestamp); this._carats = _carats; this._weight = _weight; } public int get_carats() { return _carats; } public double get_weight() { return _weight; } @Override public String toString() { return "ID: " + this.getId() + ", " + "Buyer: " + this.getBuyer() + ", " + "Seller: " + this.getSeller() + ", " + "Amount: $" + this.getAmount() + ", " + "Memo: " + this.get_memo() + ", " + "Carats: " + this.get_carats() + ", " + "Weight: " + this.get_weight() + ", " + "Timestamp: " + this.get_timestamp(); } } 

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public class LumberTransaction extends Transaction { private int _grade; private double _weight; public LumberTransaction() { super(); } public LumberTransaction(int _id, String _buyer, String _seller, double _amount, String _memo, String _timestamp, int _grade, double _weight) { super(_id, _buyer, _seller, _amount, _memo, _timestamp); this._grade = _grade; this._weight = _weight; } public int get_grade() { return _grade; } public double get_weight() { return _weight; } @Override public String toString() { return "ID: " + this.getId() + ", " + "Buyer: " + this.getBuyer() + ", " + "Seller: " + this.getSeller() + ", " + "Amount: $" + this.getAmount() + ", " + "Memo: " + this.get_memo() + ", " + "Grade: " + this.get_grade() + ", " + "Weight: " + this.get_weight() + ", " + "Timestamp: " + this.get_timestamp(); } }

TransactionManager col : ArrayList-PurchaseReceipt + add(PurchaseReceipt) + clear() +getCount(): int +getAll): ArrayList-PurchaseReceipt +findBuyer(String buyer) ArrayList PurchaseReceipt +findSeller(String seller) ArrayList PurchaseReceipt +findld(int id): PurchaseReceipt + save() +load()