Java Generics III - Wildcards

Wildcards - e.g. `? extends Number` - are needed when creating generic APIs that behave as you would expect and don't run into compile errors that make it effectively unusable. The mnemonic is "Producer Extends, Consumer Super" - PECS. Or SECS as we will see.

Table of contents:
0:00 Intro

1:17 The Generic Conundrum
5:08 Producer Extends
8:42 Consumer Super
10:50 Unknown Wildcards
11:43 When to Apply PECS

13:04 Outro

Nicolai
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