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Week 06: Wildcards and Inference

  • Wildcards

    After this unit, students should

    • be aware of the meaning of wildcard ? and bounded wildcards.
    • know how to use wildcards to write methods that are more flexible in accepting a range of types.
    • know that upper-bounded wildcard is covariant and lower-bounded wildcard is contravariant.
    • know the PECS principle and how to apply it.
    • be aware that the unbounded wildcard allows us to not use raw types in our programs.

  • Type Inference

    After this unit, students should

    • be familiar how Java infers missing type arguments.