generics Archives - IT Nursery

C#, Programming

IT Nursery

Is there a generic constructor with parameter constraint in C#?

In C# you can put a constraint on a generic method like: public class A { public static void Method<T> (T a) where ...

June 3, 2022
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Java, Programming

IT Nursery

Mockito: List Matchers with generics

Mockito offers: when(mock.process(Matchers.any(List.class))); How to avoid warning if process takes a List<Bar> instead? 4 Answers 4

June 3, 2022
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Programming, typescript

IT Nursery

Create a new object from type parameter in generic class

I’m trying to create a new object of a type parameter in my generic class. In my class View, I have 2 lists ...

June 3, 2022
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Java, Programming

IT Nursery

Why are arrays covariant but generics are invariant?

From Effective Java by Joshua Bloch, Arrays differ from generic type in two important ways. First arrays are covariant. Generics are invariant. Covariant ...

June 3, 2022
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C#, Programming

IT Nursery

Select a Dictionary with LINQ

I have used the “select” keyword and extension method to return an IEnumerable<T> with LINQ, but I have a need to return a ...

June 2, 2022
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C#, Programming

IT Nursery

C# Create New T()

You can see what I’m trying (but failing) to do with the following code: protected T GetObject() { return new T(); } Any ...

June 2, 2022
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C#, Programming

IT Nursery

foreach vs someList.ForEach(){}

There are apparently many ways to iterate over a collection. Curious if there are any differences, or why you’d use one way over ...

June 1, 2022
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C#, Programming

IT Nursery

How do you convert a DataTable into a generic list?

Currently, I’m using: DataTable dt = CreateDataTableInSomeWay(); List<DataRow> list = new List<DataRow>(); foreach (DataRow dr in dt.Rows) { list.Add(dr); } Is there a ...

May 31, 2022
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Java, Programming

IT Nursery

Difference between List, List, List, List, and List

What are the differences between List, List<?>, List<T>, List<E>, and List<Object>? 1. List List: is a raw type, therefore not typesafe. It will ...

May 31, 2022
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Java, Programming

IT Nursery

How to make a Java Generic method static?

The following is a snippet on how to make a java generic class to append a single item to an array. How can ...

May 31, 2022
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