Goal: Implement and test the base class Transaction, and the derived classes GoldTransaction, and LumberTransaction.

Deliverables: PurchaseReceipt.java, Transaction.java, GoldTransaction.java, LumberTransaction.java, Test1.java (traditional tests), Test2.java (JUnit tests).

Details:

Implement the classes using the design specified by this UML diagram.

Use a package that contains the Transaction class and its derived classes. Use this package statement:

package it313.proj4.>;

The Test1 and Test2 classes should not be placed in this package.

You may use Eclipse to generate your constructors, getters, and toString methods for your classes. Recall how to set Eclipse to use the underscore ( _ ) prefix for instance variables and a prefix for the parameters, such as the if you want one.

Instance variable information:

Class	Instance Variable	Information
Transaction	_id	4 digit value identifying the transaction
Transaction	_seller	Person or organization selling the commodity
Transaction	_buyer	Person or organization buying the commodity
Transaction	_amount	Amount paid for the commodity
Transaction	_memo	Details about the transaction
Transaction	_timestamp	Date and time of the transaction
GoldTransaction	_carats	Purity of the gold, value from 1 to 24
GoldTransaction	_weight	Weight of gold sold in grams
LumberTransaction	_grade	Grade of lumber, value from 1 (best) to 4
LumberTransaction	_weight	Weight of lumber sold in tons

The Transaction class implements the PurchaseReceipt interface,

// This interface is implemented by the Transaction class in Project 4.

package it313.proj4;

public interface PurchaseReceipt extends Comparable {

public int getId( );

public String getBuyer( );

public String getSeller( );

public double getAmount( ); }

which inherits from the Comparable interface. This means that in addition to supplying the methods getId, getBuyer, getSeller, and getAmount, a compareTo method must be supplied. It should return 1 if this._id > other._id, it should return -1 if this._id > other._id; it should return 0 if this._id == other._id. Test the compareTo method in the Transaction class to make sure that its objects are compared correctly.

Include a traditional test class Test1 and a JUnit test class Test2 that test all of the methods in the Transaction class, and all of the non-inherited methods in the derived classes. Overridden methods must be tested again for the derived classes.

Start writing JavaDoc comments for your classes. They are required in Project 4b.

Would really appreciate some help on how to do this and write all the classes, including the tests Test1 and Test2.

Also what should be written as seperate files and what to import not import and everything else.

Gold Iransaction +_carats int + weight: double + GoldTransaction) + GoldTransaction(id: int, seller String, buyer: String, amt: double, memo String, ts: String, carats: int, weight: double) + getCarats(): int +getWeight): double toString String Transaction id int seller String interface>> Comparable PurchaseReceipt> buyer: String +compareTo(other: Object): int amount: double memo String timestamp String Transaction(id: int, seller: String, buyer String, getld) int + Transaction) interface PurchaseReceipt +getld): int + getBuyer) String +getSeller) String +getAmount): double + compareToother: Object): int amt: double, memo String, ts: String) + getBuyer) String +getSeller) String +getMemo) String +toString) String +getAmount) double +getTimeStamp): String LumberTransaction _grade int _weight: double +LumberTransaction() + LumberTransaction(id: int, seller: String, buyer String, amt: double, memo String, ts: String, grade int, weight: double) + getGrade): int getWeigh) double toString String