Generics and Wildcards in Java | Part 2 | Invariance vs Covariance vs Contravariance | Geekific
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In one of Geekific’s very first videos, we discussed generics and wildcards. Today, we expand further on this topic by tackling the difference; when and why we should use the simple generic type, the non-bounded wildcard, the upper bounded wildcard and the lower bounded wildcard.
Timestamps:
00:00 Introduction
00:27 Generics, Wildcards and Invariance
01:39 Invariance vs Covariance vs Contravariance
05:37 Producer Extends Consumer Super (PECS)
07:12 Wildcards with Return Types
08:07 Thanks for Watching!
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