feat:lesson_17 added additional files

Author: txtran224

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

@@ -0,0 +1,16 @@
+package com.codedifferently.lesson17.bank;
+
+import java.util.Set;
+
+public class BusinessCheckingAccount extends CheckingAccount {
+  public BusinessCheckingAccount(String accountNumber, Set<Customer> owners, double balance) {
+    super(accountNumber, owners, balance);
+    if (!hasBusinessOwner(owners)) {
+      throw new IllegalArgumentException("requires at least one business owner.");
+    }
+  }
+
+  private boolean hasBusinessOwner(Set<Customer> owners) {
+    return owners.stream().anyMatch(Customer::isBusiness);
+  }
+}

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

@@ -0,0 +1,22 @@
+package com.codedifferently.lesson17.bank;
+
+import java.util.UUID;
+
+public class BusinessOwner extends Customer {
+
+  private final String businessName;
+
+  public BusinessOwner(UUID id, String name, String businessName) {
+    super(id, name);
+    this.businessName = businessName;
+  }
+
+  public String businessName() {
+    return businessName;
+  }
+
+  @Override
+  public boolean isBusiness() {
+    return true;
+  }
+}

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

@@ -21,6 +21,9 @@ public Check(String checkNumber, double amount, CheckingAccount account) {
     if (amount < 0) {
       throw new IllegalArgumentException("Check amount must be positive");
     }
+    if (account instanceof SavingsAccount) {
+      throw new UnsupportedOperationException("Cannot issue checks from a savings account.");
+    }
     this.checkNumber = checkNumber;
     this.amount = amount;
     this.account = account;

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

@@ -58,6 +58,11 @@ public Set<CheckingAccount> getAccounts() {
     return accounts;
   }
 
+  // defaults accounts to non-business Owners.
+  public boolean isBusiness() {
+    return false;
+  }
+
   @Override
   public int hashCode() {
     return id.hashCode();

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

@@ -0,0 +1,11 @@
+package com.codedifferently.lesson17.bank;
+
+import java.util.Set;
+
+// represents a savings account
+public class SavingsAccount extends CheckingAccount {
+
+  public SavingsAccount(String accountNumber, Set<Customer> owners, double balance) {
+    super(accountNumber, owners, balance);
+  }
+}