collections Archives - Page 5 of 12

.NET HashTable Vs Dictionary – Can the Dictionary be as fast?

I am trying to figure out when and why to use a Dictionary or a HashTable. I have done a bit of a ...

May 18, 2022
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Remove elements from collection while iterating

AFAIK, there are two approaches: Iterate over a copy of the collection Use the iterator of the actual collection For instance, List<Foo> fooListCopy ...

May 18, 2022
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How to clone ArrayList and also clone its contents?

How can I clone an ArrayList and also clone its items in Java? For example I have: ArrayList<Dog> dogs = getDogs(); ArrayList<Dog> clonedList ...

May 17, 2022
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Simple way to find if two different lists contain exactly the same elements?

What is the simplest way to find if two Lists contain exactly the same elements, in the standard Java libraries? It shouldn’t matter ...

May 16, 2022
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The opposite of Intersect()

Intersect can be used to find matches between two collections, like so: // Assign two arrays. int...

May 16, 2022
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What is difference between Collection.stream().forEach() and Collection.forEach()?

I understand that with .stream(), I can use chain operations like .filter() or use parallel stream. But what is difference between them if ...

May 15, 2022
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Java: Get first item from a collection

If I have a collection, such as Collection<String> strs, how can I get the first item out? I could just call an Iterator, ...

May 13, 2022
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Java – How to create new Entry (key, value)

I’d like to create new item that similarly to Util.Map.Entry that will contain the structure key, value. The problem is that I can’t ...

May 11, 2022
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