collections Archives - Page 4 of 12

Check a collection size with JSTL

How can I check the size of a collection with JSTL? Something like: <c:if test=”${companies.size() > 0}”> </c:if> 4 Answers 4

Why doesn’t java.util.Set have get(int index)?

by IT Nursery

I’m sure there’s a good reason, but could someone please explain why the java.util.Set interface lacks get(int Index), or any similar get() method? … Read more

Dictionary returning a default value if the key does not exist [duplicate]

by IT Nursery

This question already has answers here: Is there an IDictionary implementation that, on missing key, returns the default value instead of throwing? (18 … Read more

What is the best way to clone/deep copy a .NET generic Dictionary?

by IT Nursery

I’ve got a generic dictionary Dictionary<string, T> that I would like to essentially make a Clone() of ..any suggestions. 14 Answers 14

Does List guarantee insertion order?

by IT Nursery

Say I have 3 strings in a List (e.g. “1”,”2″,”3″). Then I want to reorder them to place “2” in position 1 (e.g. … Read more

How do I overload the square-bracket operator in C#?

by IT Nursery

DataGridView, for example, lets you do this: DataGridView dgv = …; DataGridViewCell cell = dgv[1,5]; but for the life of me I can’t … Read more

Iterating through a list in reverse order in java

by IT Nursery

I’m migrating a piece of code to make use of generics. One argument for doing so is that the for loop is much … Read more

Collections.emptyList() vs. new instance

by IT Nursery

In practice, is it better to return an empty list like this: return Collections.emptyList(); Or like this: return new ArrayList<Foo>(); Or is this … Read more

Best practice to validate null and empty collection in Java

by IT Nursery

I want to verify whether a collection is empty and null. Could anyone please let me know the best practice. Currently, I am … Read more