BankSystem.java

abstract class Account {
 private String accountNumber;
 private double balance;
 public Account(String accountNumber, double balance) {
 this.accountNumber = accountNumber;
 this.balance = balance;
 }
 public double getBalance() {
 return balance;
 }
 public void deposit(double amount) {
 balance += amount;
 System.out.println("Deposited: " + amount);
 }
 protected void setBalance(double balance) {
 this.balance = balance;
 }
 abstract void withdraw(double amount);
 public void display() {
 System.out.println("Account No: " + accountNumber);
 System.out.println("Balance: " + balance);
 }
}
class SavingsAccount extends Account {
 private final double BALANCE = 500;
 public SavingsAccount(String accNo, double balance) {
 super(accNo, balance);
 }
 @Override
 public void withdraw(double amount) {
 if (getBalance() - amount >= BALANCE) {
 setBalance(getBalance() - amount);
 System.out.println("Withdrawn from Savings: " + amount);
 } else {
 System.out.println("Minimum balance must be maintained!");
 }
 }
}
class CurrentAccount extends Account {
 private final double OVERDRAFTLIMIT = -1000;
 public CurrentAccount(String accNo, double balance) {
 super(accNo, balance);
 }
 @Override
 public void withdraw(double amount) {
 if (getBalance() - amount >= OVERDRAFTLIMIT) {
 setBalance(getBalance() - amount);
 System.out.println("Withdrawn from Current: " + amount);
 } else {
 System.out.println("Overdraft limit exceeded!");
 }
 }
}
public class BankSystem {
 public static void main(String[] args) {
 Account acc1 = new SavingsAccount("SA123", 2000);
 Account acc2 = new CurrentAccount("CA456", 1000);
 acc1.withdraw(1700); 
 acc2.withdraw(1800); 
 acc1.display();
 acc2.display();
 } 
}