Interface Separation

MyClass.java

package task4;

import java.util.List;

/**
 * @author Ivan Genchev ([email protected])
 */
public class MyClass {
  
  class Customer {
    
  }
//  
//  interface CustomerRepository {
//    void register(Customer customer);
//    
//    List<Customer> findAll();
//  }
//
  
  interface CustomerFinder {
    List<Customer> findAll();        
  }
  
  interface CustomerRegistry {
    void register(Customer customer);
    
  }
  
  class PersistentCustomerRepository implements CustomerFinder, CustomerRegistry {
    

    @Override
    public List<Customer> findAll() {
      return null;
    }

    @Override
    public void register(Customer customer) {

    }
  }
  
  
  class ClassUnderTest {

    private final CustomerFinder finder;

    ClassUnderTest(CustomerFinder finder) {
      this.finder = finder;
    }

    public void method1() {            
      finder.findAll();
    }  
  }
  
  
}