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How to reference an enum which implements an interface from a generic class


How to reference an enum which implements an interface from a generic class

By : azeus
Date : November 20 2020, 01:01 AM
should help you out The extends keyword in the generics context can represent both the normal extends or the implements meanings. So to declare the type parameter as a subtype of the interface you can do the following:
code :
abstract class Base<E extends Intrfc> {
abstract class Base<E extends Enum<E> & Intrfc> {


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How can I require a generic parameter to be an enum that implements an interface?

How can I require a generic parameter to be an enum that implements an interface?


By : user1249747
Date : March 29 2020, 07:55 AM
this one helps. I'm not 100% convinced that this is a good idea, but I bumped into some code today that's currently implemented as: , Use an '&' instead:
code :
public class MyWidget<T extends Enum<T> & MyInterface> {
    ...
}
public class MyWidget<T extends Enum<T> & MyInterface & Serializable & Cloneable> {
    ...
}
Accessing parent methods of generic enum which implements interface

Accessing parent methods of generic enum which implements interface


By : Dave Koenig
Date : March 29 2020, 07:55 AM
this one helps. You can't access values() because it's not an instance method; it's a static method belonging to the enum type. So passing an instance of the superclass Enum doesn't give you the information you need.
As far as the interface methods, declaring Enum declared certain generic information about the enum, but doesn't tell the compiler that generic_enum is itself an instance of MyInterface.
code :
public void AcceptsGeneric ( MyInterface generic_enum )
public <T extends Enum<T> & MyInterface> void AcceptsGeneric ( T generic_enum )
Generic method parameter: enum which implements an interface

Generic method parameter: enum which implements an interface


By : Ana Tota El Zamlkawy
Date : March 29 2020, 07:55 AM
Any of those help I have an interface: , Define a type variable with an intersection type:
code :
public static <E extends Enum<E> & NamedEnum> Map<Integer,String> wrong(E value) {
public static <E extends Enum<E> & NamedEnum> Map<Integer,String> wrong(Class<E> clazz) {
for (E val : clazz.getEnumConstants())
How to get valueOf & values of an Enum and call methods on an interface it implements when defined as a generic clas

How to get valueOf & values of an Enum and call methods on an interface it implements when defined as a generic clas


By : SirLanse
Date : March 29 2020, 07:55 AM
I hope this helps . You would need to pass a description of the enum to the StringToSymbolEnum constructors. Perhaps either the Class (for use in Enum.valueOf) or T[] from values.
Note, T should be defined:
code :
T extends Enum<T> & SymbolEnum
Return generic class which extends Enum and implements and Interface-Java

Return generic class which extends Enum and implements and Interface-Java


By : Jayanudin Zay
Date : March 29 2020, 07:55 AM
hop of those help? You can't just return the class object of MyFirstEnum. Your method is declared to return a class object that corresponds to an enum and implements MyInterface but it could be an enum other than MyFirstEnum that also meets this criteria. Imagine you have another enum:
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