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collections - Java HashSet vs HashMap
    I understand that HashSet is based on HashMap implementation but is used when you need unique set of elements. So ... false; return true; } } See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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260 views
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collections - Where can I learn about the various types of .NET lists?
    Does anyone know a good resource to concisely explain the different types of lists available in C# and when their ... I should be using what. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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347 views
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collections - Groovy GroupBy field with and without white spaces
    I have invoices list as below def invoices = [ 'LEDES98BI V2', 'LINE|INVOICE_DATE|INVOICE_NUMBER|INVOICE_TOTAL ... spaces on INVOICE_NUMBER? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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605 views
1 answer
collections - Mapping a list to Map Java 8 stream and groupingBy
    I have this simple Bean class: public class Book { public Book(Map<String, String> attribute) { super(); ... new features. Appreciate the help. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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362 views
1 answer
collections - Is java.util.Hashtable thread safe?
    It's been a while since I've used hashtable for anything significant, but I seem to recall the get() and put() ... to get out of this issue... See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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522 views
1 answer
collections - Java Modcount (ArrayList)
    In Eclipse, I see that ArrayList objects have a modCount field. What is its purpose? (number of modifications?) See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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559 views
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collections - Java equivalent of std::deque
    I'm a relatively new Java programmer coming from C++/STL, and am looking for a class with these characteristics (which ... would not be O(1). See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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618 views
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collections - C# -- Need an IDictionary implementation that will allow a null key
    Basically, I want something like this: Dictionary<object, string> dict = new Dictionary<object, string>(); dict. ... adding the null key. Thanks See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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516 views
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collections - Clone a List, Map or Set in Dart
    Coming from a Java background: what is the recommended way to "clone" a Dart List, Map and Set? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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315 views
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collections - How to use java.Set
    I'm trying to make it working for quite some time,but just can't seem to get it. I have object Tower built of ... ."); } How to implement it ? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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393 views
1 answer
collections - Is there java.util.concurrent equivalent for WeakHashMap?
    Can the following piece of code be rewritten w/o using Collections.synchronizedMap() yet maintaining correctness at ... obviously won't work See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
494 views
1 answer
collections - Java Stream: find an element with a min/max value of an attribute
    I have a stream of objects and I would like to find the one with a maximal value of some attribute that's ... (other than a for loop). See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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250 views
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collections - Why is there no IArray(T) interface in .NET?
    Update 2011-Jan-06: Believe it or not, I went ahead and incorporated this interface into an open source ... haven't taken into consideration. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
390 views
1 answer
collections - Multi-valued hashtable in Java
    Is it possible to have multiple values for the same key in a hash table? If not, can you suggest any such ... or interface which could be used? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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350 views
1 answer
collections - C# dictionary type with unique keys and values
    I was wondering if there was a built in type in C# that was like 'Dictionary' but where both TKey and TValue ... BCL it might exist. Any ideas? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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412 views
1 answer
collections - How to convert String into Hashmap in java
    How can I convert a String into a HashMap? String value = "{first_name = naresh, last_name = kumar, gender ... looking for a generic approach. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
503 views
1 answer
collections - Scala List function for grouping consecutive identical elements
    Given e.g.: List(5, 2, 3, 3, 3, 5, 5, 3, 3, 2, 2, 2) I'd like to get to: List(List(5) ... function that does this, but am unable to find it. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
503 views
1 answer
collections - Scala pattern matching on sequences other than Lists
    I have the following code which recursively operates on each element within a List def doMatch(list: List[Int] ... and hence the difference. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
402 views
1 answer
collections - Clojure: cons (seq) vs. conj (list)
    I know that cons returns a seq and conj returns a collection. I also know that conj "adds" the item to ... a seq cannot be used equivalently? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
362 views
1 answer
collections - Jquery how to find an Object by attribute in an Array
    Given I have an array of "purpose" objects: //array of purpose objects: var purposeObjects = [ {purpose: " ... ideas on how to achieve this? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
413 views
1 answer
collections - Difference between HashMap and ArrayList in Java?
    In Java, ArrayList and HashMap are used as collections. But I couldn't understand in which situations we should ... between both of them? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
598 views
1 answer
collections - Java 8 stream map to list of keys sorted by values
    I have map Map<Type, Long> countByType and I want to have a list which has sorted (min to max) keys by ... of types, without losing the order? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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509 views
1 answer
collections - In what conditions does powershell unroll items in the pipeline?
    Consider the following: function OutputArray{ $l = @(,(10,20)) $l } (OutputArray) -is [collections.ienumerable ... " objects into the pipeline? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
705 views
1 answer
collections - C# - Get the item type for a generic list
    What would be the best way of getting the type of items a generic list contains? It's easy enough to grab ... that makes sense. Thanks, Sonny See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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839 views
1 answer
collections - Case-INsensitive Dictionary with string key-type in C#
    If I have a Dictionary<String,...> is it possible to make methods like ContainsKey case-insensitive? ... case-insensitive through declarations See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
603 views
1 answer
collections - Printing HashMap In Java
    I have a HashMap: private HashMap<TypeKey, TypeValue> example = new HashMap<TypeKey, TypeValue>(); Now I would like to ... the size be 0 or 1? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
483 views
1 answer
collections - How can I get a List from some class properties with Java 8 Stream?
    I have a List<Person>. I need to get a List from a property of Person. For example, I have a Person ... List of a property with Stream API? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
669 views
1 answer
collections - Java Stream: divide into two lists by boolean predicate
    I have a list of employees. They have isActive boolean field. I would like to divide employees into two lists ... is the most sophisticated way? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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