Can someone please explain what this means?
Enum<T extends Enum<T>>
This seems like a circular definition, and I find it highly confusing to say the least.
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Surfing on the source code of Java, I found the following declaration:
public abstract class Enum<E extends Enum<E>>
How should it be interpreted? I'm stuck with it...
Thank you.
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I have some static initializer code:
someMethodThatTakesAHashMap(new HashMap<K, V>() {
{
put("a","value-a");
put("c","value-c");}
});
For some reason I am receiving a warning from Eclipse:
The serializable class does not declare a static ... |
I've run into a sticky problem that I can't seem to solve with java generics. This is a bit complicated, but I couldn't think of a simpler scenario to illustrate ... |
I just learn up to tree and one thing I don't understand about it is the class declaration:
for example: class BinarySearchTree<T extends Comparable<? super T>>.
Now, can you please explain me ... |
In the following code sniplet, I want to specify that:
attachment and handler share a generic type `<A>'s type only needs to be specified when notify() is invoked- Invoking
notify() is optional.
I do ... |
I am mocking an interface that doesn't use generics, but does take a Class type as an argument.
public Object query(Class c, Filter f)
{....}
Is there a way in my implementation to use ... |
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Here is what I would like to write in my java code:
private <A extends Action<R>, R extends Result> MyType<A,R> member;
This is invalid syntax however. So I end up writing:
private MyType<? extends ...
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Suppose you have a generic interface and an implementation:
public interface MyInterface<T> {
void foo(T param);
}
public class MyImplementation<T> implements MyInterface<T> {
void foo(T param) {
}
}
These two types are ... |
class Response<T>
{ ... }
Response response = new Response();
The above code compiles. I don't understand what's implied though. Shouldn't the compiler require a type specification for 'T'? e.g. something ... |
hi all it's simple class declaration public class test but i don't understand it public class test<T> .
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My understand is that specifying variance for generics in C# happens at the type declaration level: when you're creating your generic type, you specify the variance for the type arguments. In ... |
What is the difference between the following 2 method signature:
public <T extends MyClass> Set<T> getMyList() {...}
public Set<? extends MyClass> getMyList() {...}
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I want to store an array of 100 int elements in rows ie 1 row of 100 int datatypes.And every single element contains an array of 100 objects.How to do this ... |
I'm reading "Generics in the Java Programming Language" by Gilad Bracha and I'm confused about a style of declaration. The following code is found on page 8:
interface Collection<E>
{
...
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Type Variables' bounds can only appear in the declaration of classes, interface, methods and constructors?
Or can I bound a type variable when they are used as type arguments?
Edit:
Example:
class MyClass<T extends Number> ...
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Can an anonymous class declare its own type parameters?
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I want to declare a method in an interface where the parameter of the method defined in implementing classes can be a subtype of a specific java class for example:
interface Processor{
...
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I have a class that extends generic class that also extends (another) generic class.
class B<TypeB> extends C{}
class C<TypeC>{}
and now my problems is how to specify the TypeC when creating class A
should ... |
Something like this:
class C {
typeof(this) foo() { return this; }
}
Well, I know it's impossible in Java 6, so I'll be glad to hear if I can do ... |
Note: purely out of curiosity and not for any actual use case.
I'm wondering if there is a way to declare the Class Class object with valid type parameters:
Class cc1 = Class.class; ...
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So long story short I have an object model in which several different entity types share a common supertype. Any type derived from this supertype has an owning User associated ... |
I'm looking at an example implementation of a linkedlist consisting of nodes. The set method goes to the input index and sets the value equal to the input value. Additionally, it ... |
In Objective-C, I could do:
id delegate<HTTPRequestDelegate>;
to say that delegate (a variable of type id) conforms to the HTTPRequestDelegate protocol (or implements the HTTPRequestDelegate interface in Java speak).
That way, whenever I send ... |
I have an application where I want all my model classes to implement a specific update method. For this I created an abstract class and an interface with the following declaration:
public ...
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I know this isn't a good question to ask and I might get cursed to ask it but I cannot find any place to get help on this question
Below is a ... |
I have a class Element which extends Node.
I would like to declare a List<> which should work like:
List<Node> elementsList;
for( Element e : (List<Element>) elementsList ) {
}
What kind of generic type should ... |
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