Question

It is required to develop an application in Java to perform some operations of a bank. The application will have the following classes:

1. Class called Person having following data fields (private):

firstName (String), lastName(String), gender(char), cpr(long), mobile(String) and following methods:

1. Constructor having 5 parameters to initialize all data fields,
2. Set and get methods for all data fields,
3. toString method to return String equivalent of all data fields,

2. Abstract class called Account having following data fields(protected):

accountHolder(Person), ccountNum(long), balance(double)and following methods:

1. Constructor having 3 parameters for all 3 data fields including an object of type Person.
2. Get methods for all three data fields.
3. Abstract method updateBalance to update balance according to parameter.
4. Abstract method withdraw to withdraw money from the account and update balance.
5. Abstract method deposit to deposit money in the account and update balance.
6. method to return String equivalent of all data fields by calling toString method of class Person.

3. Class called Savingsccount that inherit the properties of abstract class Account having following additional data field:

interestRate(double) and following methods:

1. Constructor having 4 parameters for all data fields including that of class Account.
2. Set and get methods for interestRate.
3. Implementation of method updateBalance.
4. Implementation of method withdraw.
5. Implementation of method deposit.
6. Overloaded toString method to return String equivalent of all data fields.

4. Write a class called Bank having only main method to test all functionalities of the application.

Answer 1

The above mentioned classes are implemented as below:

//Person.java

public class Person {
        
          private String firstName;
          private String lastName;
          private char gender;
          private long cpr;
          private String mobile;
          
        public Person(String firstName,String lastName,char gender,long cpr,String mobile){
                 this.firstName=firstName;
                 this.lastName=lastName;
                 this.gender=gender;
                 this.cpr=cpr;
                 this.mobile=mobile;
        }

        public String getFirstName() {
                return firstName;
        }

        public void setFirstName(String firstName) {
                this.firstName = firstName;
        }

        public String getLastName() {
                return lastName;
        }

        public void setLastName(String lastName) {
                this.lastName = lastName;
        }

        public char getGender() {
                return gender;
        }

        public void setGender(char gender) {
                this.gender = gender;
        }

        public long getCpr() {
                return cpr;
        }

        public void setCpr(long cpr) {
                this.cpr = cpr;
        }

        public String getMobile() {
                return mobile;
        }

        public void setMobile(String mobile) {
                this.mobile = mobile;
        }
        
        public String toString(){
                return firstName+" "+lastName+" "+gender+" "+cpr+" "+mobile;
        }
          
          

}

//Account.java


public abstract class Account {
        
        protected Person accountHolder;
        protected long accountNum;
        protected double balance;
        
        public Account(Person accountHolder, long accountNum, double balance) {
                super();
                this.accountHolder = accountHolder;
                this.accountNum = accountNum;
                this.balance = balance;
        }

        public Person getAccountHolder() {
                return accountHolder;
        }

        public long getAccountNum() {
                return accountNum;
        }

        public double getBalance() {
                return balance;
        }
        
        
        abstract void updateBalance(double amount);
        abstract void withDraw(double amount);
        abstract void deposit(double amount);
        
        public String toString(){
                return accountHolder.toString()+" "+ accountNum+" "+balance;
        }

}

//SavingsAccount.java


public class SavingsAccount extends Account {
        
        double interestRate;

        public SavingsAccount(Person accountHolder, long accountNum, double balance, double interestRate) {
                super(accountHolder, accountNum, balance);
                this.interestRate=interestRate;
        }

        public double getInterestRate() {
                return interestRate;
        }

        public void setInterestRate(double interestRate) {
                this.interestRate = interestRate;
        }

        @Override
        void updateBalance(double amount) {
                this.balance=amount;
                
        }

        @Override
        void withDraw(double amount) {
        if(amount>this.balance){
                System.out.println("You don't have sufficicent balance to Withdraw");
        }else{
                updateBalance(this.balance-amount);
        }
                
        }

        @Override
        void deposit(double amount) {
                updateBalance(this.balance+amount);             
        }
        
        public String toString(){
                return accountHolder.getFirstName()+" "+accountHolder.getLastName() + " with Account number "+accountNum+" has current balance "+balance+" with interest rate of "+interestRate;
        }
        
        
}       
        

//Bank.java

public class Bank {
         public static void main(String[] args){
                 Person p1 = new Person("Sam", "Roy", 'F', 15, "978901789");
                 SavingsAccount s1 = new SavingsAccount(p1, 1148027110, 89900, 8);
                 System.out.println("Before Withdraw");
                 System.out.println(s1.toString());
                 s1.withDraw(19800);
                 System.out.println("After Withdraw and Before Deposit");
                 System.out.println(s1.toString());
                 s1.deposit(10700);
                 System.out.println("After Deposit");
                 System.out.println(s1.toString());
         }
}

The ouput screenshot for the above program is as below:

If you have any queries regarding this answer, please reach out through the comment section.