Скачать или смотреть HashMap Java Example

Interested to learn more about HashMap Class in Java? Then check out our detailed video on Java HashMap Class, through detailed examples. HashMap class is an implementation of the Map interface. HashMap is a key-value data structure and it is widely used when fast operations are of great importance.

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Sections:

00:00 - How a HashMap works
07:15 - HashMap Code Example
12:50 - HashMap Constructors
16:00 - ContainsKey - put
18:00 - get
20:10 - Iteration with KeySet
23:20 - replace
26:50 - putIfAbsent - compute
32:25 - computeIfPresent - computeIfAbsent
40:00 - getOrDefault
41:00 - remove
42:20 - Iteration with Iterator
46:35 - putAll - Copy with Constructor
49:10 - Iteration with forEach
51:40 - When to use HashMap
53:38 - Map Implementations Comparison

Instructor: Daniel Grissom

Dr. Dan Grissom has a B.S. in Computer Engineering (U of Cincinnati, '08) an M.S. in CS (UC Riverside, '11) and Ph.D in CS (UC Riverside, '14). He has been teaching a wide range of CS and CE courses since 2014, including 15+ semesters of Intro Programming in Java/Python/C++. Dr. Dan consistently receives the highest teaching evaluations from his students and his programming videos have received over 1 million views on YouTube and now has is own online course to teach beginners how to program from scratch in Java: hellodrdan.com. Dr. Dan has also held a number of full-time positions and internships in a wide variety of computer science and engineering fields from government, defense contractors, web-development, high-tech and traditional software development.

YouTube:    / @danielgrissom  

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