Recent questions tagged collections

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collections - How do you replace the value of a mutable variable by taking ownership of it?

I am working with a LinkedList and I want to remove all elements which do not pass a test. However, I am running ... way to std::mem::replace. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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531 views

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collections - Java Sorting object in ArrayList

Hi I have Card class... In another class I create an arrayList of Card objects. How would I go about sorting the ... 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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667 views

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collections - Java: Printing LinkedList without square brackets?

This is a fairly simple question. When you print out a LinkedList, like so: System.out.println(list); It ... out without the square brackets? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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447 views

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collections - What is the main difference between Hashset, Treeset and LinkedHashset, Hashmap and how does it work in Java?

I just understand that LinkedHashSet does not allows duplicate elements when it is inserting. But, I dont ... better performance in Java? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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531 views

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collections - Component to iterate and render a nested tree-like object structure in JSF

Given the class definition below: public class Comment { String username; String comment; List<Comment> replies; // ... - UserOne said blah blah See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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500 views

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collections - Implement both Map and List interface in Java?

I'd like to have an object that implements both the Map and the List interfaces in Java. The idea is similar ... 't select entries by index.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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557 views

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collections - Swift: How to declare a 2d array (grid or matrix) in Swift to allow random insert

I need to be able to store information about cells in a 2d matrix or grid. Data is not contiguous so I may ... nulls. Is there a better way? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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611 views

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collections - Is there a fast concat method for linked list in Java?

How can I concat two linked lists in O(1) with Java via jdk1.6, google or apache commons collection or whatever ... ? how to concat the inverse? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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563 views

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collections - How to check if a tuple contains an element in Python?

I tried to find the available methods but couldn't find it. There is no contains. Should I use index? I just ... don't need the index of 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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458 views

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collections - Meteor using a local connection results in error: insert failed: 404 -- Method not found

I've got a meteor collection on the client side Friends = new Meteor.Collection("Friends"); Meteor.subscribe(" ... What have I missed? Anyone? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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556 views

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collections - Is there a Directed Acyclic Graph (DAG) data type in Java, and should I use it?

I am modeling a power subsystem in Java. A simple SQLite database contains a set of Line Replaceable Units ( ... is appropriate for my scenario? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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479 views

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collections - mutable fields for objects in a Java Set

Am I correct in assuming that if you have an object that is contained inside a Java Set<> (or as a key ... I understood the implications of 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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631 views

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collections - Which HTTP code to use for an empty subresource in a REST API?

Let's say I've a resource articles at /articles. These articles may have related articles, so I fetch them by ... set, should It be a 404? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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517 views

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collections - How to add element in List while iterating in java?

Say I have a List like: List<String> list = new ArrayList<>(); list.add("a"); list.add("h"); list.add ... anybody suggest me how can I do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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428 views

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collections - Regarding HashMap implementation in java

I was trying to do research on hashmap and came up with the following analysis: https://stackoverflow.com/questions/ ... the other image is ... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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615 views

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collections - How to add element in List while iterating in java?

Say I have a List like: List<String> list = new ArrayList<>(); list.add("a"); list.add("h"); list.add ... anybody suggest me how can I do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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401 views

1 answer

collections - Regarding HashMap implementation in java

I was trying to do research on hashmap and came up with the following analysis: https://stackoverflow.com/questions/ ... the other image is ... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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525 views

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collections - Give me a practical use-case of Multi-set

I would like to know a few practical use-cases (if they are not related/tied to any programming language it ... way to answer this question". See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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582 views

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collections - How to customize the data-prototype attribute in Symfony 2 forms

Since umpteens days, I block on a problem with Symfony 2 and forms. I got a form of websites entities. "Websites ... an idea to make that hack ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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445 views

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collections - How to create Immutable List in java?

I need to convert mutable list object to immutable list. What is the possible way in java? public void action() { List ... ; this.age = age; } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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840 views

1 answer

collections - How can I convert Scala Map to Java Map with scala.Float to java.Float k/v conversion

I would like to be able to perform the following, but it fails in the call to useMap. How can I perform this ... , but not Map[Int, Float]. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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513 views

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collections - Python "set" with duplicate/repeated elements

Is there a standard way to represent a "set" that can contain duplicate elements. As I understand it, a set ... to me to be more appropriate. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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621 views

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collections - How to implement a list fold in Java

I have a List and want to reduce it to a single value (functional programming term "fold", Ruby term inject), ... { append ... } sb.toString See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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492 views

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collections - Helper to remove null references in a Java List?

Given the following List: List<String> list = new ArrayList<String>(); list.add("s1"); list.add("s2"); ... I use to fulfill this requirement? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

collections - C# Iterate through NameValueCollection

I have a NameValueCollection, and want to iterate through the values. Currently, I'm doing this, but it seems ... Console.ReadLine(); Is there? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

527 views

1 answer

collections - Why does Python not support record type? (i.e. mutable namedtuple)

Why does Python not support a record type natively? It's a matter of having a mutable version of namedtuple. I ... my device), but are mutable. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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422 views

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collections - Java: Why are wrapper classes needed?

On the very high level, I know that we need to "wrap" the primitive data types, such as int and char, by ... thank you in advance for your 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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384 views

1 answer

collections - Number of elements in a javascript object

Is there a way to get (from somewhere) the number of elements in a javascript object?? (i.e. constant-time ... : var obj = new Object ; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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