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How to force client to implement multiple generic interfaces with same type


How to force client to implement multiple generic interfaces with same type

By : user2172571
Date : October 23 2020, 08:10 AM
it should still fix some issue Lets say i have some generic interfaces , Disallow raw types.
code :
    Orchestrator orch = new Orchestrator(service, Arrays.asList(response1));
    Orchestrator<T> orch = new Orchestrator<T>(service, Arrays.asList(response1));


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Implementing multiple generic interfaces - type error

Implementing multiple generic interfaces - type error


By : Adel Ahmed
Date : March 29 2020, 07:55 AM
help you fix your problem To call the appropriate one, you'll need to make the compiler think of the expression in the appropriate way:
code :
IFooBarRepository repo = SomeMethodThatGetsTheActualClass();
IRepository<Foo> fooRepo = repo;
Foo foo = fooRepo.Get(1);
IFooBarRepository repo = SomeMethodThatGetsTheActualClass();
Foo foo = ((IRepository<Foo>)repo).Get(1);
public class FooBarRepository : IFooBarRepository
{
    Foo IRepository<Foo>.Get(int id)
    {
        return new Foo();
    } 

    Bar IRepository<Bar>.Get(int id)
    {
        return new Bar();
    } 
}
How to make a Generic Collection with Type Constraint that implement two interfaces?

How to make a Generic Collection with Type Constraint that implement two interfaces?


By : chrisu
Date : March 29 2020, 07:55 AM
Does that help excuse me I havent dealt much with generic in c# , You can do it like this:
code :
interface IEmployee { void DisplayInfo(); }
interface ISalaried { void CalculateSalary(); }
interface ISalariedEmployee : IEmployee, ISalaried {}
class Doctor : ISalariedEmployee { whatever }
class Nurse : ISalariedEmployee { whatever }
...
var list = new List<ISalariedEmployee>() { new Nurse(), new Doctor() };
var list = new List<IEmployee + ISalary>();
How to implement multiple generic interfaces

How to implement multiple generic interfaces


By : Allan Wang
Date : March 29 2020, 07:55 AM
Any of those help A very simple question I assume...But how do I accomplish something like the following: , Make it:
code :
class MyHandler implements ApplicationListener<ApplicationContextEvent> {

    public void onApplicationEvent(ApplicationContextEvent event) {
        if (event instanceof ContextStartedEvent) {
            onContextStarted((ContextStartedEvent)event);
        }
        ...
    }

    private void onContextStarted(ContextStartedEvent event) {
        ...
    }
}
Subscription model with generics - implement multiple generic interfaces

Subscription model with generics - implement multiple generic interfaces


By : Junliang Luo
Date : March 29 2020, 07:55 AM
this will help I would reverse the order, and use a Visitor Pattern:
code :
import java.util.*;

interface Event{
    void receive(Receiver receiver);    
}

class KeyEvent implements Event{
    @Override
    public void receive(Receiver receiver){
        receiver.receive(this);
    }   
}

class MouseEvent implements Event {
    @Override
    public void receive(Receiver receiver){
        receiver.receive(this);
    }   
}

interface Receiver {
    void receive(KeyEvent event);
    void receive(MouseEvent event);
}

class ClientRegistry {
    private Set<Receiver> clients = new HashSet<Receiver>();

    public void subscribe(Receiver client) {
        clients.add(client);
    }

    public void unsubscribe(Receiver client) {
        clients.remove(client);
    }

    public void broadcast(Event eventObject) {
        for(Receiver client: clients) {
            eventObject.receive(client);
        }       
    }   
}

public class Screen implements Receiver {

    public void receive(KeyEvent event) {
        //work
        System.out.println("Processing key event");
    }
    public void receive(MouseEvent event) {
        //work
        System.out.println("Processing mouse event");
    }


    public static void main(String[] args){
        ClientRegistry registry = new ClientRegistry();
        registry.subscribe(new Screen());
        registry.broadcast(new MouseEvent());
    }
}
Java Generics: Implement multiple sub-interfaces of an generic interface

Java Generics: Implement multiple sub-interfaces of an generic interface


By : Line Tousignant
Date : March 29 2020, 07:55 AM
To fix the issue you can do According to @Ted's comment. Because of type erasure, you aren't going to be able to do this. Basically, all generic type parameters end up as Object in the compiled byte code.
Also according to @assylias's comment, there can be ambiguous situation as whose instance of update() method to call MainClass.update() is invoked.
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