Library management system (IO stream)

Project content: Functional structure diagram of the project:   The project functions are as follows: (1) Reader information management: including reader information addition and reader information query and modification functions. After logging in successfully, users can browse the information of all readers or retrieve the informatio ...

Posted on Fri, 26 Nov 2021 04:38:25 -0500 by olidenia

No one uses collections better than I do! Yes, it's a collection in dart

brief introductionThere are three sets in dart: list, set and map. Dart provides very useful methods for these three collections in the dart:core package. Let's take a look.Use of ListFirst, create a list. You can create an empty list or a list with values:var emptyList =[]; var nameList = ['jack','mac']; Use the constructor of List to create: ...

Posted on Thu, 25 Nov 2021 21:14:24 -0500 by misschristina95

java advanced level 7 (set advanced operation)

JavaSE advanced day 7 Syllabus: aggregate 1, Collection architecture 1. Current column set 1.1 Collection interface 1.1.1 general 1.Is the top-level interface of a single column collection. It represents a set of objects, also known as Collection Element of 2.JDK Instead of providing any direct implementation of this interface, it prov ...

Posted on Fri, 19 Nov 2021 19:01:46 -0500 by rohithreddyk

Foreach traversal principle and attention pit, Iterator

foreach principle and attention pit, Iterator 1. Principle of foreach Let's look at a piece of code first public static void main(String[] args) { ArrayList<Object> list = new ArrayList<>(); list.add("1"); list.add("2"); for (Object o : list) { System.out.println(o); } ...

Posted on Thu, 18 Nov 2021 01:12:12 -0500 by ratcateme

Detailed explanation of ArrayList of hanging interviewers

ArrayList overview ArrayList implements the List interface, which is actually an array List. However, as a collection framework of Java, it can only store object reference types, that is, when the data we need to load is basic data types such as int and float, we must convert them into corresponding wrapper classes. The underlying implementat ...

Posted on Sun, 07 Nov 2021 23:43:55 -0500 by malcolmboston

Python learning 13 - basic data types - set

Personal learning summary notes. If there are deficiencies and errors, please give advice. Thank you Set 1. It consists of different elements, enclosed in {} braces and separated by commas 2. Disordered 3. Elements in the collection must be of variable type 4. The collection will be automatically de duplicated For example: s = {1,2,3,4,5, ...

Posted on Thu, 28 Oct 2021 05:10:56 -0400 by the_NEWBIE_ON_THE_BLOCK

An article makes you proficient: explanation of java collection (II, ArrayList)

List collection The main implementation classes are ArrayList and LinkedList, which are the implementation of sequential table and list in data structure respectively. It also includes the implementation classes of stack and Queue. Deque and Queue. (both basic data types and reference data types (objects) can be placed in the array. Only refer ...

Posted on Tue, 26 Oct 2021 08:03:43 -0400 by MilesStandish

JAVA Collection Series: HashMap

Introduction to HashMap HashMap is a hash table that stores key value mappings.HashMap   The Map interface implementation based on hash table is one of the commonly used Java collections and is thread unsafe.HashMap   Null keys and values can be stored, but there can only be one null as a key and multiple null as a value.HashMap &nbs ...

Posted on Thu, 30 Sep 2021 18:16:20 -0400 by YuriM

Common interview questions in Java collection of school recruitment interview

Interview summary The main questions in this section are ArrayList and HashMap. HashMap this piece of source code must be understood. In the eyes of some interviewers, it is a necessary foundation. Question summary and answer sorting (for reference only) 1. The difference between ArrayList and LinkedList (both thread unsafe) ArrayList i ...

Posted on Sat, 25 Sep 2021 02:02:54 -0400 by phrygius

Detailed explanation of Set object and Map object in front-end JS (probability, creation, use method, etc.)

Map and Set Map and Set are two new data types in ES6Are built-in constructorsInstantiate using new Set It is used in conjunction with new const s = new Set() console.log(s) /* Set(0) {} [[Entries]] No properties size: (...) __proto__: Set */ Is a data set We can add data directly to the inside when ...

Posted on Mon, 20 Sep 2021 03:40:42 -0400 by mulysa