bank done

src/main/java/rocks/zipcode/quiz5/collections/Bank.java

@@ -2,18 +2,33 @@ package rocks.zipcode.quiz5.collections;
 
 import rocks.zipcode.quiz5.objectorientation.account.BankAccount;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * @author leon on 27/12/2018.
  */
 public class Bank {
+
+    private List<BankAccount> accounts;
+
+    public Bank() {
+        this.accounts = new ArrayList<>();
+    }
+
     public BankAccount removeBankAccountByIndex(Integer indexNumber) {
-        return null;
+        BankAccount bankAccount = accounts.get(indexNumber);
+        accounts.remove(bankAccount);
+
+        return bankAccount;
     }
 
     public void addBankAccount(BankAccount bankAccount) {
+        accounts.add(bankAccount);
     }
 
     public Boolean containsBankAccount(BankAccount bankAccount) {
-        throw new UnsupportedOperationException("Method not yet implemented");
+        return accounts.contains(bankAccount);
+        // throw new UnsupportedOperationException("Method not yet implemented");
     }
 }