4.Write a Java programming to create a banking system with three classes - Bank, Account, SavingsAccount, and CurrentAccount. The bank should have a list of accounts and methods for adding them. Accounts should be an interface with methods to deposit, withdraw, calculate interest, and view balances. SavingsAccount and CurrentAccount should implement the Account interface and have their own unique methods.
💡Code:
// A class to represent a bank
class Bank {
// A list of accounts in the bank
private java.util.List accounts;
// A constructor to initialize the list
public Bank() {
accounts = new java.util.ArrayList();
}
// A method to add an account to the bank
public void addAccount(Account account) {
accounts.add(account);
}
// A method to display the details of all accounts
public void displayAccounts() {
for (Account account : accounts) {
System.out.println(account);
}
}
}
// An interface to represent an account
interface Account {
// A method to deposit money into the account
public void deposit(double amount);
// A method to withdraw money from the account
public void withdraw(double amount);
// A method to calculate the interest on the account
public double calculateInterest();
// A method to view the balance of the account
public double getBalance();
// A method to display the details of the account
public String toString();
}
// A class to represent a savings account
class SavingsAccount implements Account {
// A constant to store the interest rate
private static final double INTEREST_RATE = 0.05;
// A variable to store the account number
private int accountNumber;
// A variable to store the balance of the account
private double balance;
// A constructor to initialize the account number and balance
public SavingsAccount(int accountNumber, double balance) {
this.accountNumber = accountNumber;
this.balance = balance;
}
// A method to deposit money into the account
public void deposit(double amount) {
balance += amount;
}
// A method to withdraw money from the account
public void withdraw(double amount) {
if (balance >= amount) {
balance -= amount;
} else {
System.out.println("Insufficient funds");
}
}
// A method to calculate the interest on the account
public double calculateInterest() {
return balance * INTEREST_RATE;
}
// A method to view the balance of the account
public double getBalance() {
return balance;
}
// A method to display the details of the account
public String toString() {
return "SavingsAccount[accountNumber=" + accountNumber + ", balance=" + balance + "]";
}
}
// A class to represent a current account
class CurrentAccount implements Account {
// A constant to store the overdraft limit
private static final double OVERDRAFT_LIMIT = 1000;
// A variable to store the account number
private int accountNumber;
// A variable to store the balance of the account
private double balance;
// A constructor to initialize the account number and balance
public CurrentAccount(int accountNumber, double balance) {
this.accountNumber = accountNumber;
this.balance = balance;
}
// A method to deposit money into the account
public void deposit(double amount) {
balance += amount;
}
// A method to withdraw money from the account
public void withdraw(double amount) {
if (balance + OVERDRAFT_LIMIT >= amount) {
balance -= amount;
} else {
System.out.println("Overdraft limit exceeded");
}
}
// A method to calculate the interest on the account
public double calculateInterest() {
return 0; // No interest for current account
}
// A method to view the balance of the account
public double getBalance() {
return balance;
}
// A method to display the details of the account
public String toString() {
return "CurrentAccount[accountNumber=" + accountNumber + ", balance=" + balance + "]";
}
}
// A class to test the program
class Test {
public static void main(String[] args) {
// Create a bank object
Bank bank = new Bank();
// Create some account objects
Account a1 = new SavingsAccount(101, 5000);
Account a2 = new CurrentAccount(102, 3000);
Account a3 = new SavingsAccount(103, 7000);
Account a4 = new CurrentAccount(104, 4000);
// Add the accounts to the bank
bank.addAccount(a1);
bank.addAccount(a2);
bank.addAccount(a3);
bank.addAccount(a4);
// Display the details of all accounts
bank.displayAccounts();
// Deposit some money into a1
a1.deposit(1000);
// Withdraw some money from a2
a2.withdraw(2000);
// Calculate the interest for a3
System.out.println("Interest for a3: " + a3.calculateInterest());
// Display the balance of a4
System.out.println("Balance of a4: " + a4.getBalance());
// Display the details of all accounts again
bank.displayAccounts();
}
}
📸Output :
