diff --git a/src/BankAccount.java b/src/BankAccount.java new file mode 100644 index 0000000..27573a3 --- /dev/null +++ b/src/BankAccount.java @@ -0,0 +1,19 @@ +public class BankAccount { + private double balance; + + public BankAccount(double balance) { + this.balance = balance; + } + + public double getBalance() { + return balance; + } + + public void deposit(double amount) { + balance += amount; + } + + public void withdraw(double amount) { + balance -= amount; + } +} diff --git a/src/BaseTransaction.java b/src/BaseTransaction.java new file mode 100644 index 0000000..6001e33 --- /dev/null +++ b/src/BaseTransaction.java @@ -0,0 +1,47 @@ +import java.util.Calendar; + +public class BaseTransaction implements TransactionInterface { + protected double amount; + protected Calendar date; + protected String transactionID; + + // Constructor + public BaseTransaction(double amount, Calendar date, String transactionID) { + this.amount = amount; + this.date = date; + this.transactionID = transactionID; + } + + @Override + public double getAmount() { + return amount; + } + + @Override + public Calendar getDate() { + return date; + } + + @Override + public String getTransactionID() { + return transactionID; + } + + // Common method to print transaction details + public void printTransactionDetails() { + System.out.println("Transaction ID: " + transactionID); + System.out.println("Amount: " + amount); + System.out.println("Date: " + date.getTime()); + } + + // Method to apply the transaction (meant to be overridden by subclasses) + public void apply(BankAccount ba) { + System.out.println("Applying transaction..."); + } + + // Default reverse method (can be overridden if needed) + public boolean reverse(BankAccount ba) { + System.out.println("Reversal not supported for this transaction."); + return false; + } +} diff --git a/src/DepositTransaction.java b/src/DepositTransaction.java new file mode 100644 index 0000000..bea2e69 --- /dev/null +++ b/src/DepositTransaction.java @@ -0,0 +1,20 @@ +import java.util.Calendar; + +public class DepositTransaction extends BaseTransaction { + + public DepositTransaction(double amount, Calendar date, String transactionID) { + super(amount, date, transactionID); + } + + @Override + public void apply(BankAccount ba) { + ba.deposit(amount); + System.out.println("Deposit successful: " + amount); + } + + @Override + public boolean reverse(BankAccount ba) { + System.out.println("Deposits cannot be reversed."); + return false; + } +} diff --git a/src/InsufficientFundsException.java b/src/InsufficientFundsException.java new file mode 100644 index 0000000..494041d --- /dev/null +++ b/src/InsufficientFundsException.java @@ -0,0 +1,6 @@ +public class InsufficientFundsException extends Exception { + public InsufficientFundsException(String message) { + super(message); + } +} +//insufficient Funds diff --git a/src/Main.java b/src/Main.java index 584a048..314d389 100644 --- a/src/Main.java +++ b/src/Main.java @@ -1,156 +1,26 @@ -import Lecture1_adt.*; // Import all classes from Lecture1_adt package to be used in this client code - import java.util.Calendar; -import java.util.GregorianCalendar; -import java.util.ArrayList; -import java.util.List; -//TIP To Run code, press or -// click the icon in the gutter. -/* -* Client Code for accessing the Lecture1_adt.TransactionInterface.java module - */ public class Main { + public static void main(String[] args) { + BankAccount account = new BankAccount(1000.0); + Calendar date = Calendar.getInstance(); - public static void testTransaction1() { - Calendar d1 = new GregorianCalendar(); // d1 is an Object [Objects are Reference types] - Lecture1_adt.Transaction1 t1 = new Lecture1_adt.Transaction1(1000, d1); // amount and d1 are arguments - - System.out.println(t1.toString()); - System.out.println("Lecture1_adt.TransactionInterface Amount: \t " + t1.amount); - System.out.println("Lecture1_adt.TransactionInterface Date: \t " + t1.date); - - // Please note that the Client Codes can access the data in the class directly through the dot operator - // This kind of exposure is a threat to both the Representation Independence and Preservation of Invariants - } - - - /** @return a transaction of same amount as t, one month later - * This is a PRODUCER of the class Lecture1_adt.Transaction2 - * This code will help demostrate the Design exposures still present in transaction2 class - * */ - - public static Transaction2 makeNextPayment(Transaction2 t) { - Calendar d = t.getDate(); - d.add(Calendar.MONTH, 1); - return new Transaction2(t.getAmount(), d); - } - - /* - Testing Transaction2 class - */ - public static void testTransaction2() { - - Calendar d1 = new GregorianCalendar(); - - Lecture1_adt.Transaction2 t = new Lecture1_adt.Transaction2(1000, d1); - - Lecture1_adt.Transaction2 modified_t = makeNextPayment(t); - - System.out.println("\n\nState of the Object T1 After Client Code Tried to Change the Amount"); - System.out.println("Lecture1_adt.TransactionInterface Amount: \t "+modified_t.getAmount()); - System.out.println("Lecture1_adt.TransactionInterface Date: \t "+modified_t.getDate().getTime()); - - System.out.println("\n\nHow does T2 Look Like?????"); - System.out.println("Lecture1_adt.TransactionInterface Amount: \t "+modified_t.getAmount()); - System.out.println("Lecture1_adt.TransactionInterface Date: \t "+modified_t.getDate().getTime()); - - /* Please note that Although we have solved the problem of Transaction1 - * And client code can no longer use the dot (.) operator to directly access the data - * There is still some exposure especially if we pass an object of a previous Transaction2 to create a new Transaction2 object - */ - - } - - - /** @return a list of 12 monthly payments of identical amounts - * This code will help demostrate the Design exposures still present in transaction3 class - * */ - public static List makeYearOfPayments (int amount) throws NullPointerException { - - List listOfTransaction3s = new ArrayList(); - Calendar date = new GregorianCalendar(2024, Calendar.JANUARY, 3); - - - for (int i = 0; i < 12; i++) { - listOfTransaction3s.add(new Transaction3(amount, date)); - date.add(Calendar.MONTH, 1); - } - return listOfTransaction3s; - } - - /* - Testing Transaction3 class - */ - public static void testTransaction3() { - - List allPaymentsIn2024 = makeYearOfPayments(1000); - - for (Transaction3 t3 : allPaymentsIn2024) { - - // Display all the 12 Transactions - for (Transaction3 transact : allPaymentsIn2024) { - System.out.println("\n\n ::::::::::::::::::::::::::::::::::::::::::::\n"); - System.out.println("Lecture1_adt.TransactionInterface Amount: \t "+transact.getAmount()); - System.out.println("Lecture1_adt.TransactionInterface Date: \t "+transact.getDate().getTime()); - } - } - - /* Please Check all the 12 transactions displayed and hwo their dates look like - * Note that Although Transaction3 class resolves to an extent the exposure in Transaction2 class - * There is still some exposure especially if we pass an object of a previous Transaction3 to create a - * new Transaction3 object - */ - } - - - /** @return a list of 12 monthly payments of identical amounts - * This code Show that by judicious copying and defensive programming we eliminate the exposure in Transaction3 - * As defined in the constructor of Transaction4 class - * */ - - public static List makeYearOfPaymentsFinal (int amount) throws NullPointerException { - - List listOfTransaction4s = new ArrayList(); - Calendar date = new GregorianCalendar(2024, Calendar.JANUARY, 3); - - - for (int i = 0; i < 12; i++) { - listOfTransaction4s.add(new Transaction4(amount, date)); - date.add(Calendar.MONTH, 1); - } - return listOfTransaction4s; - } - - /* - Testing Transaction3 class - */ - public static void testTransaction4() { - - /* - * Call the function to make all the Twelve transaction in a year of our business - */ - - List transactionsIn2024 = makeYearOfPaymentsFinal(1200); + // Create DepositTransaction + DepositTransaction deposit = new DepositTransaction(500.0, date, "D123"); + deposit.apply(account); + deposit.printTransactionDetails(); - // Display all the 12 Transactions - for (Transaction4 transact : transactionsIn2024) { - System.out.println("\n\n ::::::::::::::::::::::::::::::::::::::::::::\n"); - System.out.println("Lecture1_adt.TransactionInterface Amount: \t "+transact.getAmount()); - System.out.println("Lecture1_adt.TransactionInterface Date: \t "+transact.getDate().getTime()); - } + // Create WithdrawalTransaction + WithdrawalTransaction withdrawal = new WithdrawalTransaction(300.0, date, "W456"); + withdrawal.apply(account); + withdrawal.printTransactionDetails(); - // Please Take a look at all the 12 transaction now and compare with the outputs of the Transaction3 class - } + // Test reversal of withdrawal + withdrawal.reverse(account); + // Try to reverse deposit + deposit.reverse(account); - public static void main(String[] args) { - // This is the client code - // Uncomment the following lines to test the class which you would like to test - - // testTransaction1() - // testTransaction2() - // testTransaction3() - // testTransaction4() + System.out.println("Final Balance: " + account.getBalance()); } -} \ No newline at end of file +} diff --git a/src/TransactionInterface.java b/src/TransactionInterface.java new file mode 100644 index 0000000..376b299 --- /dev/null +++ b/src/TransactionInterface.java @@ -0,0 +1,10 @@ +import java.util.Calendar; + +public interface TransactionInterface { + double getAmount(); + Calendar getDate(); + String getTransactionID(); + void printTransactionDetails(); + void apply(BankAccount ba); + boolean reverse(BankAccount ba); +} diff --git a/src/WithdrawalTransaction.java b/src/WithdrawalTransaction.java new file mode 100644 index 0000000..4d37c48 --- /dev/null +++ b/src/WithdrawalTransaction.java @@ -0,0 +1,28 @@ +import java.util.Calendar; + +public class WithdrawalTransaction extends BaseTransaction { + + public WithdrawalTransaction(double amount, Calendar date, String transactionID) { + super(amount, date, transactionID); + } + + @Override + public void apply(BankAccount ba) { + try { + if (ba.getBalance() < amount) { + throw new InsufficientFundsException("Insufficient funds for withdrawal."); + } + ba.withdraw(amount); + System.out.println("Withdrawal successful: " + amount); + } catch (InsufficientFundsException e) { + System.out.println(e.getMessage()); + } + } + + @Override + public boolean reverse(BankAccount ba) { + ba.deposit(amount); + System.out.println("Withdrawal reversed: " + amount); + return true; + } +}