Question

Assignment 4: Objects that contain objects

In this assignment, you will implement a Java application, called BankApplication, that can be used to manage bank accounts. The application is to be implemented using three classes, called Account, Customer, and BankDriver. The description of these classes is below.

Problem Description

class Account

The Account class keeps track of the balance in a bank account with a varying annual interest rate. The Account class is identified as follows:
• two double instance variables, called balance and annualRate.
• A constructor that takes two input parameters to initialize the balance and annualRate instance variables.
• No-argument constructor to set both the balance and annualRate to zero.
• Getters for both instance variables.
• deposit: a method than takes an amount (of type double) and adds that amount of money to account's balance.
• withdraw: a method than takes an amount (of type double) and withdraws that amount of money from the balance. If the amount to be withdrawn is greater than the current balance, then the method displays as error message and does not change the balance.
• addInterest: a method that adds interest to the balance at the current rate. The method takes an input (of type int) indicating how many years-worth of interest to be added. For example, if the account's balance is 1000 and annualRate is 0.05, the call addInterest(3) will add 3-years-worth of interest (i.e., 3*1000*0.05) to the current balance. (Note that interest calculations can be more complex if the second year's interest is to be calculated using the first's year balance after adding first year's interest and so on. However, for simplicity, you are not required to implement this more complex interest calculations).
• equals: a method to test the equality of two accounts. Two accounts are considered to be equal if they have the same balance and the same annualRate.
• toString: a method that returns a nicely formatted string description of the account.


class Customer

The Customer class represents a bank customer. A customer is identified by the following instance variables:
• name: a string that represents customer name
• checkingAccount: an instance variable of type Account
• savingAccount: an instance variable of type Account
Implement the following methods for the Customer class:

• A constructor that takes as input only the customer's name and creates a customer with zero balance and zero rate in both accounts.
• A constructor that takes five inputs that represent the customer's name and four double variables that represent the customer's checking account's balance, checking account's annual rate, saving account's balance, and saving account's annual rate.
• Getter methods for the saving and checking accounts.
• getTotalBalance: a method that calculates and returns the total balance of a customer (which is the sum of the checking account's balance and the saving account's balance).
• creditAccount: a method that takes two inputs to represent the account type and an amount of money to deposit. Note that account type is either 1 for saving account or 2 for checking account. The method then calls the appropriate Account's deposit method to add the specified amount of money. For example, the call creditAccount(1,500) adds 500 to the saving account while the call creditAccount(2,500) adds 500 to the checking account. The method should display an error message if the first input is any number other than 1 or 2.
• debitAccount: similar to creditAccount but it withdraws money form the specified account.
• addInterest: similar to creditAccount, this method takes as input account type and number of years. The method then adds interest to the specified account.
• toString: a method that returns a string representation of the customer that includes customer name, details of customer's accounts and customer’s total balance.

class BankDriver

Your driver class should do the following actions:
• creates two customers with your choice of names, balances, and annual rate values.
• adds 1 year-worth of interest to all checking accounts.
• adds 3 years-worth of interest to all saving accounts.
• Check whether the checking account of the first customer is equal to the checking account of the second cusomter.
• prints all customers’ information in a nicely formatted output.


Important Requirements

The output of our program must be nicely formatted.
• The programs should display your name.
• At the top of the program include your name, a brief description of the program and what it does and the due date.
• Add appropriate comments to your code.
• All code blocks must be indented consistently and correctly. Blocks are delimited by opening and closing curly braces. Opening and closing curly braces must be aligned consistently.
• Variable names should convey meaning.
• The program must be written in Java and submitted via D2L.

Draw a UML diagram of your application that includes the Account and Customer classes but not the BankDriver class.

Answer 1

Name:- Utkarsh Jain

This is a program for Bank called "BankApplication". It contains three classes named as Account that stores information about your Account, Customer that store information about customers and BankDriver that performs all the operations for your Bank.

// Account Class
public class Account {
    
    private double balance; // Account Balance
    private final double annualRate; // Account AnnualRate

    // No Args Constructor
    public Account() {
        this.balance = 0;
        this.annualRate = 0;
    }

    // All Args Constructor
    public Account(double balance, double annualRate) {
        this.balance = balance;
        this.annualRate = annualRate;
    }

    // Getter for Balance
    public double getBalance() {
        return balance;
    }

    // Getter for AnnualRate
    public double getAnnualRate() {
        return annualRate;
    }

    // To Deposit your Amount
    public void deposit(double amount) {
        this.balance += amount;
    }

    // To Withdraw your Amount
    public void withdraw(double amount) {
        if (amount > this.balance) {
            System.out.println("Insufficient Balance, Your Account have only Rs. "+this.balance+" left.");
        }
        else {
            this.balance -= amount;
        }
    }

    // To Add Interest for particular year
    public void addInterest(int years) {
        this.balance += (this.balance*this.annualRate*years);
    }

    // Check whether 2 Accounts are equal or not
    public boolean equals(Account account) {
        return account.balance == this.balance && account.annualRate == this.annualRate;
    }

    // Return Account Details
    public String toString() {
        return "{" +
                "balance=" + balance +
                ", annualRate=" + annualRate +
                '}';
    }
}

// Customer Class
public class Customer {

    private final String name; // Customer Name
    private final Account checkingAccount; // Customer Checking Account
    private final Account savingAccount; // Customer Saving Account

    // 1 params Constructor 
    public Customer(String name) {
        this.name = name;
        this.checkingAccount = new Account();
        this.savingAccount = new Account();
    }

    // 5 params Constructor
    public Customer(String name,double ch_Balance,double ch_annualRate,double s_Balance,double s_annualRate) {
        this.name = name;
        this.checkingAccount = new Account(ch_Balance,ch_annualRate);
        this.savingAccount = new Account(s_Balance,s_annualRate);
    }

    // Getter for Checking Account
    public Account getCheckingAccount() {
        return checkingAccount;
    }

    // Getter for Saving Account
    public Account getSavingAccount() {
        return savingAccount;
    }

    // Get Total Balance of a Customer
    public double getTotalBalance() {
        return this.checkingAccount.getBalance()+this.savingAccount.getBalance();
    }

    // Credit Balance to your Account
    public void creditAccount(int type,double amount) {
        if (type == 1) {
            this.checkingAccount.deposit(amount);
        }
        else if (type == 2) {
            this.savingAccount.deposit(amount);
        }
        else {
            System.out.println("Invalid Account Type, It must lies in [1,2].");
        }
    }

    // Debit Balance to your Account
    public void debitAccount(int type,double amount) {
        if (type == 1) {
            this.checkingAccount.withdraw(amount);
        }
        else if (type == 2) {
            this.savingAccount.withdraw(amount);
        }
        else {
            System.out.println("Invalid Account Type, It must lies in [1,2].");
        }
    }

    // Add a Interest to your Account
    public void addInterest(int type,int years) {
        if (type == 1) {
            this.checkingAccount.addInterest(years);
        }
        else if (type == 2) {
            this.savingAccount.addInterest(years);
        }
        else {
            System.out.println("Invalid Account Type, It must lies in [1,2].");
        }
    }

    // Return Customer Details
    public String toString() {
        return "Customer{" +
                "name='" + name + '\'' +
                ", checkingAccount=" + checkingAccount +
                ", savingAccount=" + savingAccount +
                '}';
    }
}

// BankDriver Class
public class BankDriver {

    // Main Method
    public static void main(String[] args) {

        // Creates 1st Customer
        Customer customer1 = new Customer("Steve Job",10000,0.02,4000,0.05);
        // Creates 2nd Customer
        Customer customer2 = new Customer("Utkarsh Jain",100000,0.04,40000,0.06);
        // Add Interest in Checking Account of Customer 1 for 1 year
        customer1.addInterest(1,1);
        // Add Interest in Checking Account of Customer 2 for 1 year
        customer2.addInterest(1,1);
        // Add Interest in Saving Account of Customer 1 for 3 year
        customer1.addInterest(2,3);
        // Add Interest in Saving Account of Customer 2 for 3 year
        customer2.addInterest(2,3);
        // Check whether 2 Customer Checking Accounts are same or not
        if (customer1.getCheckingAccount().equals(customer2.getCheckingAccount())) {
            System.out.println("Both Customers have Same Checking Account.");
        }
        else {
            System.out.println("Both Customers have Different Checking Account.");
        }
        // Print Details of Customer 1
        System.out.println(customer1.toString());
        // Print Details of Customer 2
        System.out.println(customer2.toString());
    }
}