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日期：2018-09-13 01:56

SENG1110/6110 Programming Assignment 1 – Semester 2, 2018

GOODMATES LOAN INSTITUTION

Introduction

The objective of this assignment is the implementation of an object oriented program using Java to receive information

from a potential client and calculate and display details of a possible loan from the GoodMates Loan Institution. The

assignment 2 will be an extension of this assignment.

Before you start

Carefully read the specification below. Make sure that you have all the information necessary to start the program. Do not

assume what is necessary. There is a discussion board forum: assignment 1. Post your questions there and check it

regularly. Start the assignment as soon as possible (after your computer lab this week). You will find the document

“HelpToStartAssign1” and some Java files in Blackboard, which gives you some initial steps to start the assignment. I will

answer questions and clarify any issue in the next week lecture (week 6).

Specification

The program will start asking for the following inputs:

• User name

• User age

• User income per year

• amount of money the user would like to borrow

• number of months the user would like to pay

• type of account (see below)

If the user inputs a negative number, the program should show a message and ask the input again.

There are two types of accounts the user can choose:

1) No fees. If the user chooses this option, the interest rate will be

a. 6.5% if n < 50

b. 7.5% if 50 <= n < =100

c. 8.5% if n > 100

where n is number of months

2) Fees. The interest rate will be 6%, but the user needs to pay an additional fee of $10 every month.

Next, the program will output the monthly payment, which will be calculated using the formula:

p = (1)

where d = amount to borrow, a = 1+r/12, r = interest rate and n = number of months

Then, the program will show the amortization table. Each row of the table will show:

• month

• initial balance

• payment

• interest paid

• principal paid

• final balance

The payment is calculated by the formula (1).

The interest paid will be (initial balance)*r/12.

12* ( a 1)

d * r* a

n

n

-

The principal paid will be (payment - interest paid)

The final balance will be (initial balance – payment + interest paid.)

The program will also inform

• Total payment

• Total interest paid

For example:

Suppose the following inputs:

Name = Joao da Silva

Age = 31

Income per year = 60000

Amount to borrow = 10000

Months to pay = 10

Account type = no fees

The output would be:

Joao Silva, age 31, income 60000

Amount to borrow = 10000 to pay in 10 months in accountType “no fees”.

The interest rate will be 6.5%.

The month payment will be p = $1030.03.

The total payment is 10300.34

Total interest paid is 300.34.

The amortization table is:

Month InitBalance MonthPayment InterestPaid PrincipalPaid FinalBalance

1 $10000.00 $1030.03 $54.17 $975.87 $9024.13

2 $9024.13 $1030.03 $48.88 $981.15 $8042.98

3 $8042.98 $1030.03 $43.57 $986.47 $7056.51

4 $7056.51 $1030.03 $38.22 $991.81 $6064.70

5 $6064.70 $1030.03 $32.85 $997.18 $5067.52

6 $5067.52 $1030.03 $27.45 $1002.58 $4064.94

7 $4064.94 $1030.03 $22.02 $1008.01 $3056.92

8 $3056.92 $1030.03 $16.56 $1013.47 $2043.45

9 $2043.45 $1030.03 $11.07 $1018.96 $1024.48

10 $1024.48 $1030.03 $5.55 $1024.48 $0.00

In the end, the program will ask the user if he/she would like to start the program again.

Program Requirements

There must be three classes: Client, Account and LoanCalculator.

• The Account class (the file needs to be Account.java)

It will hold the required instance data for an account and it will have suitable methods to access and modify the data

for an account.

The instance variables will be

• interestRate – double

• numberOfMonths – int

• amount – double

• accountType – String

You need to implement at least one constructor, which will initialize the instance variables with values from

parameters. The class needs to have methods to change and access all instance variables. It will also have the

following methods (at least):

• setInterestRate, which will set the value in the interestRate which will depend on the type of the

account (as explained above).

• calculateMontlyPayment, which will calculate the formula (1)

• setAmortizationTable - it will output a String with the table information.

• The Client Class (the file needs to be Client.java)

It will hold the required instance data for a client and it will have suitable methods to access and modify the data for a

client.

The instance variables will be:

• name – String

• age – int

• income – double

• loan – Account

You need to implement at least one constructor that will have the parameters name, age and income. The class needs

to have methods to change and access all instance variables.

• The LoanCalculator Class (the file needs to be LoanCalculator.java)

It will receive inputs and show outputs. It will have a Client variable. This is the only class that should have a main

method. The class LoanCalculator will also be the only one that will receive inputs and show outputs.

You can use TIO or GUI (it is your choice). On both cases, you should use only the classes have seen in lectures.

All the instance variables of your classes need to be private (this means that you are applying the principles of

encapsulation).

Marks will be awarded for: layout, both visual (variable names, indentation) and structural (scope of variables, use of

methods); documentation (comments); and ability of the submission to perform as specified. A more detailed marking

schema will be available in Blackboard.

You will find a document called HelpToStartAssign1 and a template of all classes in Blackboard. You do not need to use

these files neither follow the suggestions in the HelpToStartAssign1 document. It is optional.

What to submit.

You should submit the Java files (Client.java, Account.java and LoanCalculator.java) and the assignment cover sheet

(available in Blackboard) electronically under the Assignment 1 link in Blackboard. No .class files should be included in your

submission, only .java files.

Extra Work for SENG6110 students

You must to implement the LoanCalculator class using GUI. You need to provide a UML class diagram of your program. You

will find Powerpoint slides with an introduction of UML available in Blackboard in the area called ‘SENG6110 extra

material’. Ask Regina if you need any help.

Late Penalty and adverse circumstances

Note that your mark will be reduced by 10% for each day (or part day) that the assignment is late. This applies equally to

week and weekend days. You are entitled to apply for special consideration because adverse circumstances have had an

impact on your performance in an assessment item. This includes applying for an extension of time to complete an

assessment item.

In the Blackboard you will find a new forum in the discussion board: “assignment1”. Any question about the assignment 1

you can post there. Check this forum regularly.