What helped me understand variance annotation / modifiers was thinking about what type of scope (specific or broad) are being saved.

  • Uses out
  • Supertype (broad) saves subtype (specific)
  • Uses in
  • Subtype (specific) saves supertype (broad)

This post was great, in addition to Baeldung’s guide, in order to understand the fundamentals.

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Adam Hurwitz

Adam Hurwitz

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