/module-practical-task

1-module in Java Global Mentoring Program (practical project regarding java 9 modules)

Primary LanguageJava

Necessary Tools Java Development Kit 11+ Apache Maven 3.6.0+ Git 2.24+ ##Task (1-2 stars)

  1. Create maven project with 5 modules (see Java 9 modules) :
  • jmp-bank-api
  • jmp-service-api
  • jmp-cloud-bank-impl
  • jmp-cloud-service-impl
  • jmp-dto
  1. Create the fallowing classes under jmp-dto module :

  • [User] String name; String surname; LocalDate birthday;

  • [BankCard] String number; User user;

  • [Subscription] String bankcard; LocalDate startDate;

  1. Extend BankCard class with :
  • CreditBankCard
  • DebitBankCard
  1. Create enum :
  • [BankCardType] CREDIT DEBIT
  1. Add Bank interface to jmp-bank-api with :
  • BankCard createBankCard(User, BankCardType);
  1. Add module-info.java which :
  • requires jmp-dto
  • export Bank interface
  1. Implement Bank into jmp-cloud-bank-impl. Method should create a new class depending on the type:
  2. Add module-info.java which :
  • requires transitive module with Bank interface
  • requires jmp-dto
  • exports implementation of Bank interface
  1. Add Service interface to jmp-service-api with :
  • void subscribe(BankCard)
  • Optional getSubscriptionByBankCardNumber(String)
  • List getAllUsers();
  1. Add module-info.java which :
  • requires jmp-dto
  • export Service interface
  1. Implement Service into jmp-cloud-service-impl. User Stream API, You can use Memory/DB for data storing :
  2. Add module-info.java which :
  • requires transitive module with Service interface
  • requires jmp-dto
  • exports implementation of Service interface
  1. Use var for definition of local variables wherever it’s applicable.
  2. Use lambdas and Java 8 features wherever it’s applicable.
  3. Create application module.
  4. Add module-info.java which :
  • use interfaces
  • requires module with Bank implementation
  • requires module with Service implementation
  • requires jmp.dto;
  1. Demonstrate functionality of created classes. (3-4 stars)
  2. Add a new default method for Service interface, which uses getAllUsers. Use LocalDate.now(), ChronoUnit и mapToLong.
  • double getAverageUsersAge();
  1. Add a new static method for Service interface, which returns true, if the user is over 18 years old.
  • boolean isPayableUser(User);
  1. Use Collectors.toUnmodifiableList() and method reference it’s applicable. (5 stars)
  2. Create Exception class which will be used into orElseThrow for Optional from getSubscriptionByBankCardNumber().
  3. Add a new method for Service interface and implement it. Demonstrate this method ino application module:
  • List getAllSubscriptionsByCondition(Predicate);
  1. Reimplement createBankCard with method reference (ex: CreditBankCard::new).
  2. Add to module-info jar for each implementation module :
  • provides [interface] with [implementation]
  1. Add a module with Service implementation. Try to use ServiceLoader.load() for module loading. References • Java 8 new features • Java 9 new features • - modules • Java 10 new features • - var • Java 11 new features