fix: customer java isBusiness boolean included , removes for loop of hasBusinessAccount

feat: adds java documentation in businessCheckingAccount

Author: AmiyahJo

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

@@ -4,12 +4,22 @@
 public class BusinessCheckingAccount extends CheckingAccount{
     private final String businessName;
 
+    /**
+     * Creates a new business checking account.
+     *
+     * @param accountNumber The account number.
+     * @param owners The owners of the account.
+     * @param businessName The name of the business.
+     * @param initialBalance The initial balance of the account.
+     * @throws IllegalArgumentException if no business owner is provided.
+     */
     public BusinessCheckingAccount(String accountNumber, Set<Customer> owners, String businessName, double initialBalance) {
         super(accountNumber, owners, initialBalance);
-        this.businessName = businessName;
-    }
 
-    public String getBusinessName() {
-        return businessName;
-    }    
+        boolean hasBusinessOwner = owners.stream().anyMatch(Customer::isBusiness);
+        if (!hasBusinessOwner) {
+            throw new IllegalArgumentException("At least one owner must be a business.");
+        }
+        this.businessName = businessName;
+    }   
 }

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

@@ -10,16 +10,18 @@ public class Customer {
   private final UUID id;
   private final String name;
   private final Set<CheckingAccount> accounts = new HashSet<>();
+  private final boolean isBusiness;
 
   /**
    * Creates a new customer.
    *
    * @param id The ID of the customer.
    * @param name The name of the customer.
    */
-  public Customer(UUID id, String name) {
+  public Customer(UUID id, String name, boolean isBusiness) {
     this.id = id;
     this.name = name;
+    this.isBusiness = isBusiness;
   }
 
   /**
@@ -40,6 +42,10 @@ public String getName() {
     return name;
   }
 
+  public boolean isBusiness() {
+    return isBusiness;
+  }
+
   /**
    * Adds a checking account to the customer.
    *
@@ -58,20 +64,6 @@ public Set<CheckingAccount> getAccounts() {
     return accounts;
   }
 
-  /**
-   * Checks if the customer has at least one business account.
-   *
-   * @return true if the customer has a business account, false otherwise.
-   */  
-  public boolean hasBusinessAccount() {
-    for (CheckingAccount account : accounts) {
-      if (account instanceof BusinessCheckingAccount) {
-        return true; // Found a business account
-      }
-    }
-    return false;
-  }
-
   @Override
   public int hashCode() {
     return id.hashCode();