hashset

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Why can we supply a Comparator to TreeSet but not something like Hasher to HashSet?

In Java 6, my understanding is that you can supply a Comparator to a TreeSet when creating it to override the \"natural ordering\" of the objects in the set.[详细]

2023-01-30 07:01 分类：问答
What causes the slightly unpredictable ordering of the iterator() for the java.util.HashSet and HashMap.keySet() classes?

Six years ago, I burned several days trying to hunt down where my perfectly deterministic framework was responding randomly开发者_如何转开发. After meticulously chasing the entire framework ensuring t[详细]

2023-01-29 21:40 分类：问答
ReSharper 5.x, HashSet Contains(), and "Possible 'null' assignment"

This code outputs True. using System; using System.C开发者_如何学JAVAollections.Generic; public class Default[详细]

2023-01-29 03:52 分类：问答
Java Hashset.contains() produces mysterious result

I don\'t usually code in Java, but recently I started not having a choice. I might have some major misunderstanding of how to properly use HashSet. So it might be possible something I did is just plai[详细]

2023-01-24 01:08 分类：问答
HashSet with two equals object?

I created an object HashSet, and the value is an object (Triple) which is my own class. But I get a strange thing, when there are two equal objects on my HashSet, is it possible? Here is my overriding[详细]

2023-01-22 09:35 分类：问答
How do I hash a 2-d array efficiently (to be stored in a HashSet)?

I\'ve written a class called PuzzleBoard that represe开发者_如何学Pythonnts an nxn board. I will be keeping several PuzzleBoard objects in a HashSet, so I have to overwrite the \'int hashCode()\' meth[详细]

2023-01-21 06:19 分类：问答
What's the difference between these two java variable declarations?

public class SomeClass { private HashSet<SomeObject> contents = new HashSet<SomeObject>();[详细]

2023-01-19 21:08 分类：问答
C# HashSet union on IEnumerable within LINQ Func expression does not work (possible precompiler bug)

I am using using Microsoft .NET Framework 4.0. I have run into this using Aggregate on a Dictionary<T, List<T>> to extract the set of type T values used across all type List<T> list[详细]

2023-01-19 20:44 分类：问答
Requirements for entities in NHibernate to be used in a HashedSet

I would like to use the Iesi.Collections HashedSet class for entity collections in NHibernate. The functionality I want is that duplicate entities cannot be added. I would like entities to be consider[详细]

2023-01-19 19:54 分类：问答
Lock a hashset in Java

I have a static HashSet of object references in my code, which has to disallow all write requests until a given method is running (which uses the hashset only for read purpose开发者_如何学Cs). I have[详细]

2023-01-19 18:35 分类：问答