Examine & add comments to the Bank Account class: The following code defines a v

Question

Examine & add comments to the Bank Account class:

The following code defines a very simple class called BankAccount. Observe that the class is similar but not the same as the one that was used in Assignment 6. It contains 3 data items (or attributes) and a collection of instance methods (or behaviours) for changing the values of that data. import java.util.*;

public class BankAccount {

private int accountNumber; private String ownerName;

private double balance;

public BankAccount() { accountNumber = 0; ownerName = ""; balance = 0.0; }

public BankAccount(int number, String name, double initialDeposit) { accountNumber = number; ownerName = name; balance = initialDeposit; }

public int getAccountNumber() { return accountNumber; }

public void setAccountNumber(int number) { accountNumber = number; }

public String getOwnerName() { return ownerName; }

public void setOwnerName(String name) { ownerName = name; }

public double getBalance() { return balance; }

public void setBalance(double newAmount) { balance = newAmount; }

public void deposit(double amount) { balance += amount; }

public void withdrawl(double amount) { balance -= amount; }

public String toString() { return accountNumber + " " + ownerName + " " + balance; } }

Use this code, including its methods where-ever possible: there is no need to change it.

The Bank: A program that uses the BankAccount class:

In a different Java class, called TheBank.java create a Bank program with the following specifications:

? The Bank’s client file information is loaded from a file (named AccountBackUp.dat) that contains at most 1000 lines. Each line of the file contains a string representing the customer name, a unique integer identification number for the account and the current account balance in the account. (An array of BankAccounts should be created to hold the client file information. Use a constructor from the BankAccount class to instantiate each of the accounts.)

? Next, the Bank’s monthly transaction file (named TransactionsJanuary.dat) containing a month of transaction information is loaded from a file. (There is no limit on the number of lines in the file.) Each line contains a customer name and unique identification number, the type of transaction and the amount of the transaction. The transaction type could be one of (deposit, withdrawal, interest, charge). The amount of a deposit must be added to the BankAccount’s balance; the amount of a withdrawal or (service) charge must be subtracted from the balance; and interest requires adding ‘amount’ % interest to the BankAccount. Before applying each transaction, the name and identification number must be checked to see that they correspond to a single account; an error log must be added to an error log file (called error.dat) if they do not. Use member methods of the BankAccount class to alter the attributes of the appropriate BankAccount object.

? Output the entire updated Bank client file information (including customer name, identification number and account balance) into a file, called TransactionsFebruary.dat, ensuring that it is sorted in order of ascending identification number. Observe that the instance method toString() can be used to make a single String containing all attributes of a BankAccount object.

? Output, to the screen, the Bank client file information (just the customer name and account balance) to the screen, ensuring that it is sorted in order of descending account balance amount. This output should be output in groups of 20 lines, then the output stops waits for the user to hit the ‘Enter’ key.

The following code defines a very simple class called BankAccount. Observe that the class is similar but not the same as the one that was used in Assignment 6. It contains 3 data items (or attributes) and a collection of instance methods (or behaviours) for changing the values of that data. import java.util.*;

public class BankAccount {

private int accountNumber; private String ownerName;

private double balance;

public BankAccount() { accountNumber = 0; ownerName = ""; balance = 0.0; }

public BankAccount(int number, String name, double initialDeposit) { accountNumber = number; ownerName = name; balance = initialDeposit; }

public int getAccountNumber() { return accountNumber; }

public void setAccountNumber(int number) { accountNumber = number; }

public String getOwnerName() { return ownerName; }

public void setOwnerName(String name) { ownerName = name; }

public double getBalance() { return balance; }

public void setBalance(double newAmount) { balance = newAmount; }

public void deposit(double amount) { balance += amount; }

public void withdrawl(double amount) { balance -= amount; }

public String toString() { return accountNumber + " " + ownerName + " " + balance; } }

Use this code, including its methods where-ever possible: there is no need to change it.

The Bank: A program that uses the BankAccount class:

In a different Java class, called TheBank.java create a Bank program with the following specifications:

? The Bank’s client file information is loaded from a file (named AccountBackUp.dat) that contains at most 1000 lines. Each line of the file contains a string representing the customer name, a unique integer identification number for the account and the current account balance in the account. (An array of BankAccounts should be created to hold the client file information. Use a constructor from the BankAccount class to instantiate each of the accounts.)

? Next, the Bank’s monthly transaction file (named TransactionsJanuary.dat) containing a month of transaction information is loaded from a file. (There is no limit on the number of lines in the file.) Each line contains a customer name and unique identification number, the type of transaction and the amount of the transaction. The transaction type could be one of (deposit, withdrawal, interest, charge). The amount of a deposit must be added to the BankAccount’s balance; the amount of a withdrawal or (service) charge must be subtracted from the balance; and interest requires adding ‘amount’ % interest to the BankAccount. Before applying each transaction, the name and identification number must be checked to see that they correspond to a single account; an error log must be added to an error log file (called error.dat) if they do not. Use member methods of the BankAccount class to alter the attributes of the appropriate BankAccount object.

? Output the entire updated Bank client file information (including customer name, identification number and account balance) into a file, called TransactionsFebruary.dat, ensuring that it is sorted in order of ascending identification number. Observe that the instance method toString() can be used to make a single String containing all attributes of a BankAccount object.

? Output, to the screen, the Bank client file information (just the customer name and account balance) to the screen, ensuring that it is sorted in order of descending account balance amount. This output should be output in groups of 20 lines, then the output stops waits for the user to hit the ‘Enter’ key.

Explanation / Answer

import java.util.*;

public class BankAccount {

//declaring the variables

private int accountNumber; private String ownerName;

private double balance;

//default constructor that accepts no parameters and initialises instance varibles to 0 and empty string
public BankAccount() { accountNumber = 0; ownerName = ""; balance = 0.0; }

//constructor that accepts accountNumber , ownerName, balance and sets these variables
public BankAccount(int number, String name, double initialDeposit) { accountNumber = number; ownerName = name; balance = initialDeposit; }

//returns the account number
public int getAccountNumber() { return accountNumber; }

//sets the account number
public void setAccountNumber(int number) { accountNumber = number; }

//return the owner name
public String getOwnerName() { return ownerName; }

//sets the owner name
public void setOwnerName(String name) { ownerName = name; }

//returns the balance
public double getBalance() { return balance; }

//sets the balance
public void setBalance(double newAmount) { balance = newAmount; }

//deposits amount to the account
public void deposit(double amount) { balance += amount; // add the amount to the balance variable}

//withdraws money from account
public void withdrawl(double amount) { balance -= amount; //subtract amount from balance}

//returns the string representation of the bank account class
public String toString() { return accountNumber + " " + ownerName + " " + balance; } }

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.