generics Archives - Page 9 of 11

What is a raw type and why shouldn’t we use it?

Questions: What are raw types in Java, and why do I often hear that they shouldn’t be used in new code? What is ...

April 23, 2022
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How to get the type of T from a member of a generic class or method

Let’s say I have a generic member in a class or method, like so: public class Foo<T> { public List<T> Bar { get; ...

April 22, 2022
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How do I get a class instance of generic type T?

I have a generics class, Foo<T>. In a method of Foo, I want to get the class instance of type T, but I ...

April 21, 2022
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What is PECS (Producer Extends Consumer Super)?

I came across PECS (short for Producer extends and Consumer super) while reading up on generics. Can someone explain to me how to ...

April 20, 2022
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Is List a subclass of List? Why are Java generics not implicitly polymorphic?

I’m a bit confused about how Java generics handle inheritance / polymorphism. Assume the following hierarchy – Animal (Parent) Dog – Cat (Children) ...

April 20, 2022
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Difference between

This question already has answers here: What is PECS (Producer Extends Consumer Super)? (16 answers) Closed 3 years ago. What is the difference ...

April 16, 2022
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How to create a generic array in Java?

Due to the implementation of Java generics, you can’t have code like this: public class GenSet<E> { private E a...

April 14, 2022
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How do I use reflection to call a generic method?

What’s the best way to call a generic method when the type parameter isn’t known at compile time, but instead is obtained dynamically ...

April 14, 2022
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Create Generic method constraining T to an Enum

I’m building a function to extend the Enum.Parse concept that Allows a default value to be parsed in case that an Enum value ...

April 13, 2022
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