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Course Introduction：Polymorphism: Exploring "List list = new ArrayList" vs. "ArrayList list = new ArrayList"When working with Java collections,...

2024-11-03 comment 0  588

Course Introduction：Polymorphism: Why Utilize "List list = new ArrayList" over "ArrayList list = new ArrayList"?In programming, polymorphism allows multiple classes...

2024-11-01 comment 0  515

Course Introduction：Polymorphism: The Advantage of "List list = new ArrayList" Over "ArrayList list = new ArrayList"Programming with polymorphism enables greater...

2024-11-02 comment 0  819

Course Introduction：A LinkedHashMap in Java maintains the insertion order of elements, unlike a regular HashMap. Converting an ArrayList to a LinkedHashMap requires assigning keys to each ArrayList element. The simplest approach uses the ArrayList index as the key. I

2025-02-07 comment 0  391

Course Introduction：ArrayList is suitable for frequent access to elements, while LinkedList is suitable for frequent insertion or deletion of intermediate elements. 1. In terms of internal structure, ArrayList is implemented based on dynamic arrays, with continuous memory and supports fast index access; LinkedList is implemented based on bidirectional linked lists, with low random access efficiency and traversal search. 2. When inserting and deleting, ArrayList needs to move subsequent elements, and the time complexity is O(n); LinkedList only modifies the pointer and can reach O(1) at known node locations. 3. In usage scenarios, you need to quickly access the ArrayList; frequently add and delete the LinkedList in the middle; select the memory-sensitive ArrayList; modify the link during iteration

2025-07-11 comment 0  925

Course Elementary  13772

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82280

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13144

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24590

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27446

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.