~/talk

Do It Yourself: Collections

Talkat JetBrains Technology Day for Java 2020 · on Friday, 2020-07-10· [java]

speaker

name:Nikhil Nanivadekar

x:NikhilNanivade

resources

video:https://youtu.be/wlH_s3sGxTo

slides:none on file

summary

Extends Map to deliver two concrete collections: bag (MultiSet) counts occurrences per element and multimap (MultiValuedMap) maps keys to collections of values, implemented from scratch using only JDK data structures (HashMap + ArrayList) and driven by TDD-driven development with live unit tests. Adds concrete APIs—add, removeOne, count, putAll, asMap view—and demonstrates handling of duplicates, empty inputs, defensive copies and mutation-via-views; shows the code compiles and tests pass and discusses the knobs needed to make the new collections safe and usable.

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