collections Archives - Page 6 of 12

What is the Simplest Way to Reverse an ArrayList?

What is the simplest way to reverse this ArrayList? ArrayList<Integer> aList = new ArrayList<>(); //Add elements to ArrayList object aList.add("1"); aList.add("2"); aList.add("3"); aList.add("4"); ...

May 11, 2022
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Java Ordered Map

In Java, Is there an object that acts like a Map for storing and accessing key/value pairs, but can return an ordered list ...

May 11, 2022
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Cost of len() function

What is the cost of len() function for Python built-ins? (list/tuple/string/dictionary) 5 Answers 5

May 10, 2022
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How to quickly and conveniently create a one element arraylist [duplicate]

This question already has answers here: Initialization of an ArrayList in one line (33 answers) Closed 5 years ago. Is there a Utility ...

May 9, 2022
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Getting an element from a Set

Why doesn’t Set provide an operation to get an element that equals another element? Set<Foo> set = ...; ... Foo foo = new ...

May 8, 2022
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Is there an AddRange equivalent for a HashSet in C#

With a list you can do: list.AddRange(otherCollection); There is no add range method in a HashSet. What is the best way to add ...

May 8, 2022
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defaultdict of defaultdict?

Is there a way to have a defaultdict(defaultdict(int)) in order to make the following code work? for x in stuff: d[x.a]...

May 7, 2022
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