feat: adds Account superclass for CheckingAccount

Author: Evan Philakhong

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

@@ -0,0 +1,100 @@
+package com.codedifferently.lesson17.bank;
+
+import com.codedifferently.lesson17.bank.exceptions.InsufficientFundsException;
+
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.Set;
+
+/**
+ * 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/CheckingAccount.java

@@ -1,131 +1,34 @@
 package com.codedifferently.lesson17.bank;
 
-import com.codedifferently.lesson17.bank.exceptions.InsufficientFundsException;
+import lombok.Getter;
+
 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;
+@Getter
+public class CheckingAccount extends Account {
 
   /**
    * Creates a new checking account.
    *
-   * @param accountNumber The account number.
-   * @param owners The owners of the account.
+   * @param accountNumber  The account number.
+   * @param owners         The owners of the account.
    * @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()
         + '}';
   }
 }