feat: implements SavingsAccount & BusinessCheckingAccount class

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/Account.java

@@ -0,0 +1,94 @@
+package com.codedifferently.lesson17.bank;
+
+import com.codedifferently.lesson17.bank.exceptions.InsufficientFundsException;
+import java.util.Set;
+import lombok.Getter;
+import lombok.Setter;
+
+/** Abstract base class for all bank accounts. */
+@Getter
+@Setter
+public abstract class Account {
+  private final Set<Customer> owners;
+  private final String accountNumber;
+  private double balance;
+  private boolean isActive;
+
+  /**
+   * Creates a new account.
+   *
+   * @param accountNumber The account number.
+   * @param owners The owners of the account.
+   * @param initalBalance The inital balance of the account.
+   */
+  public Account(String accountNumber, Set<Customer> owners, double initalBalance) {
+    this.accountNumber = accountNumber;
+    this.owners = owners;
+    this.balance = initalBalance;
+    this.isActive = true;
+  }
+
+  /**
+   * Deposits funds into the account.
+   *
+   * @param amount The amount to deposit.
+   */
+  public void deposit(double amount) throws IllegalStateException {
+    if (isClosed()) {
+      throw new IllegalStateException("Cannot deposit to a closed account");
+    }
+    if (amount <= 0) {
+      throw new IllegalArgumentException("Deposit amount must be positive");
+    }
+    balance += amount;
+  }
+
+  /**
+   * Withdraws funds from the account.
+   *
+   * @param amount
+   * @throws InsufficientFundsException
+   */
+  public void withdraw(double amount) throws InsufficientFundsException {
+    if (isClosed()) {
+      throw new IllegalStateException("Cannot withdraw from a closed account");
+    }
+    if (amount <= 0) {
+      throw new IllegalStateException("Withdrawal amount must be positive");
+    }
+    if (balance < amount) {
+      throw new InsufficientFundsException("Account does not have enough funds for withdrawal");
+    }
+    balance -= amount;
+  }
+
+  /** Closes the account. */
+  public void closeAccount() throws IllegalStateException {
+    if (balance > 0) {
+      throw new IllegalStateException("Cannot close account with a positive balance");
+    }
+    isActive = false;
+  }
+
+  /**
+   * Checks if the account is closed.
+   *
+   * @return True if the account is closed, otherwise false.
+   */
+  public boolean isClosed() {
+    return !isActive;
+  }
+
+  @Override
+  public int hashCode() {
+    return accountNumber.hashCode();
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (obj instanceof CheckingAccount other) {
+      return accountNumber.equals(other.getAccountNumber());
+    }
+    return false;
+  }
+}

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/BankAtm.java

@@ -10,14 +10,14 @@
 public class BankAtm {
 
   private final Map<UUID, Customer> customerById = new HashMap<>();
-  private final Map<String, CheckingAccount> accountByNumber = new HashMap<>();
+  private final Map<String, Account> accountByNumber = new HashMap<>();
 
   /**
    * Adds a checking account to the bank.
    *
    * @param account The account to add.
    */
-  public void addAccount(CheckingAccount account) {
+  public void addAccount(Account account) {
     accountByNumber.put(account.getAccountNumber(), account);
     account
         .getOwners()
@@ -33,7 +33,7 @@ public void addAccount(CheckingAccount account) {
    * @param customerId The ID of the customer.
    * @return The unique set of accounts owned by the customer.
    */
-  public Set<CheckingAccount> findAccountsByCustomerId(UUID customerId) {
+  public Set<Account> findAccountsByCustomerId(UUID customerId) {
     return customerById.containsKey(customerId)
         ? customerById.get(customerId).getAccounts()
         : Set.of();
@@ -46,7 +46,7 @@ public Set<CheckingAccount> findAccountsByCustomerId(UUID customerId) {
    * @param amount The amount to deposit.
    */
   public void depositFunds(String accountNumber, double amount) {
-    CheckingAccount account = getAccountOrThrow(accountNumber);
+    Account account = getAccountOrThrow(accountNumber);
     account.deposit(amount);
   }
 
@@ -57,8 +57,13 @@ public void depositFunds(String accountNumber, double amount) {
    * @param check The check to deposit.
    */
   public void depositFunds(String accountNumber, Check check) {
-    CheckingAccount account = getAccountOrThrow(accountNumber);
-    check.depositFunds(account);
+    Account account = getAccountOrThrow(accountNumber);
+
+    if (account instanceof CheckingAccount checkingAccount) {
+      check.depositFunds(checkingAccount);
+    } else if (account instanceof SavingsAccount) {
+      throw new IllegalStateException("Savings Accounts can't accept checks");
+    }
   }
 
   /**
@@ -68,7 +73,7 @@ public void depositFunds(String accountNumber, Check check) {
    * @param amount
    */
   public void withdrawFunds(String accountNumber, double amount) {
-    CheckingAccount account = getAccountOrThrow(accountNumber);
+    Account account = getAccountOrThrow(accountNumber);
     account.withdraw(amount);
   }
 
@@ -78,8 +83,8 @@ public void withdrawFunds(String accountNumber, double amount) {
    * @param accountNumber The account number.
    * @return The account.
    */
-  private CheckingAccount getAccountOrThrow(String accountNumber) {
-    CheckingAccount account = accountByNumber.get(accountNumber);
+  private Account getAccountOrThrow(String accountNumber) {
+    Account account = accountByNumber.get(accountNumber);
     if (account == null || account.isClosed()) {
       throw new AccountNotFoundException("Account not found");
     }

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/Check.java

@@ -7,7 +7,7 @@ public class Check {
 
   private final String checkNumber;
   private final double amount;
-  private final CheckingAccount account;
+  private final Account account;
   private boolean isVoided = false;
 
   /**
@@ -17,7 +17,7 @@ public class Check {
    * @param amount The amount of the check.
    * @param account The account the check is drawn on.
    */
-  public Check(String checkNumber, double amount, CheckingAccount account) {
+  public Check(String checkNumber, double amount, Account account) {
     if (amount < 0) {
       throw new IllegalArgumentException("Check amount must be positive");
     }
@@ -45,7 +45,7 @@ public void voidCheck() {
    *
    * @param toAccount The account to deposit the check into.
    */
-  public void depositFunds(CheckingAccount toAccount) {
+  public void depositFunds(Account toAccount) {
     if (isVoided) {
       throw new CheckVoidedException("Check is voided");
     }

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/CheckingAccount.java

@@ -1,15 +1,9 @@
 package com.codedifferently.lesson17.bank;
 
-import com.codedifferently.lesson17.bank.exceptions.InsufficientFundsException;
 import java.util.Set;
 
 /** Represents a checking account. */
-public class CheckingAccount {
-
-  private final Set<Customer> owners;
-  private final String accountNumber;
-  private double balance;
-  private boolean isActive;
+public class CheckingAccount extends Account {
 
   /**
    * Creates a new checking account.
@@ -19,113 +13,19 @@ public class CheckingAccount {
    * @param initialBalance The initial balance of the account.
    */
   public CheckingAccount(String accountNumber, Set<Customer> owners, double initialBalance) {
-    this.accountNumber = accountNumber;
-    this.owners = owners;
-    this.balance = initialBalance;
-    isActive = true;
-  }
-
-  /**
-   * Gets the account number.
-   *
-   * @return The account number.
-   */
-  public String getAccountNumber() {
-    return accountNumber;
-  }
-
-  /**
-   * Gets the owners of the account.
-   *
-   * @return The owners of the account.
-   */
-  public Set<Customer> getOwners() {
-    return owners;
-  }
-
-  /**
-   * Deposits funds into the account.
-   *
-   * @param amount The amount to deposit.
-   */
-  public void deposit(double amount) throws IllegalStateException {
-    if (isClosed()) {
-      throw new IllegalStateException("Cannot deposit to a closed account");
-    }
-    if (amount <= 0) {
-      throw new IllegalArgumentException("Deposit amount must be positive");
-    }
-    balance += amount;
-  }
-
-  /**
-   * Withdraws funds from the account.
-   *
-   * @param amount
-   * @throws InsufficientFundsException
-   */
-  public void withdraw(double amount) throws InsufficientFundsException {
-    if (isClosed()) {
-      throw new IllegalStateException("Cannot withdraw from a closed account");
-    }
-    if (amount <= 0) {
-      throw new IllegalStateException("Withdrawal amount must be positive");
-    }
-    if (balance < amount) {
-      throw new InsufficientFundsException("Account does not have enough funds for withdrawal");
-    }
-    balance -= amount;
-  }
-
-  /**
-   * Gets the balance of the account.
-   *
-   * @return The balance of the account.
-   */
-  public double getBalance() {
-    return balance;
-  }
-
-  /** Closes the account. */
-  public void closeAccount() throws IllegalStateException {
-    if (balance > 0) {
-      throw new IllegalStateException("Cannot close account with a positive balance");
-    }
-    isActive = false;
-  }
-
-  /**
-   * Checks if the account is closed.
-   *
-   * @return True if the account is closed, otherwise false.
-   */
-  public boolean isClosed() {
-    return !isActive;
-  }
-
-  @Override
-  public int hashCode() {
-    return accountNumber.hashCode();
-  }
-
-  @Override
-  public boolean equals(Object obj) {
-    if (obj instanceof CheckingAccount other) {
-      return accountNumber.equals(other.accountNumber);
-    }
-    return false;
+    super(accountNumber, owners, initialBalance);
   }
 
   @Override
   public String toString() {
     return "CheckingAccount{"
         + "accountNumber='"
-        + accountNumber
+        + getAccountNumber()
         + '\''
         + ", balance="
-        + balance
+        + getBalance()
         + ", isActive="
-        + isActive
+        + isActive()
         + '}';
   }
 }

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/Customer.java

@@ -3,49 +3,38 @@
 import java.util.HashSet;
 import java.util.Set;
 import java.util.UUID;
+import lombok.Getter;
+import lombok.Setter;
 
+@Getter
+@Setter
 /** Represents a customer of the bank. */
 public class Customer {
 
   private final UUID id;
   private final String name;
-  private final Set<CheckingAccount> accounts = new HashSet<>();
+  private final CustomerType type;
+  private final Set<Account> accounts = new HashSet<>();
 
   /**
    * Creates a new customer.
    *
    * @param id The ID of the customer.
    * @param name The name of the customer.
+   * @param type The type of customer (individual or business)
    */
-  public Customer(UUID id, String name) {
+  public Customer(UUID id, String name, CustomerType type) {
     this.id = id;
     this.name = name;
-  }
-
-  /**
-   * Gets the ID of the customer.
-   *
-   * @return The ID of the customer.
-   */
-  public UUID getId() {
-    return id;
-  }
-
-  /**
-   * Gets the name of the customer.
-   *
-   * @return The name of the customer.
-   */
-  public String getName() {
-    return name;
+    this.type = type;
   }
 
   /**
    * Adds a checking account to the customer.
    *
    * @param account The account to add.
    */
-  public void addAccount(CheckingAccount account) {
+  public void addAccount(Account account) {
     accounts.add(account);
   }
 
@@ -54,7 +43,7 @@ public void addAccount(CheckingAccount account) {
    *
    * @return The unique set of accounts owned by the customer.
    */
-  public Set<CheckingAccount> getAccounts() {
+  public Set<Account> getAccounts() {
     return accounts;
   }