Конструирование ПО. Семинар 6: Generics, PECS, Wildcards, Type erasure

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Конструирование ПО
Семинар 6: Generics, PECS, Wildcards, Type erasure
Хохлов Игорь Дмитриевич, приглашённый преподаватель ФКН НИУ ВШЭ

2.

T
T
T
T
extends
super
Generics

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Generics

4.

Generics

5.

Generics

6.

Generics

7.

Generics

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Covariance
Generics

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Invariance
Generics

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Wildcards <?>
Generics

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Producer extends, consumer super
PECS
Generics

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Hierarchy (B2 extends A1, …)
PECS: hierarchy
Generics

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List<? extends C2> list = …;
PECS: extends
Generics

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List<? super C2> list = …;
PECS: super
Generics

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class A class B class C
PECS: hierarchy
Generics

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List<? extends T> list reading and assigning
PECS: extends
Generics

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List<? super T> list writing and assigning
PECS: super
Generics

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Collections.copy(List<? super T>, List<? extends T>)
PECS: practice
Generics

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<T extends Object & Comparable<? super T>>
PECS: practice
Generics

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<?>
Generics

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<?>
Generics

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«Wildcard Capture» pattern
<?> Oracle Docs
Generics

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PECS: test
Generics

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Practice
Generics

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Practice
Generics

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Practice
Generics

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Type erasure
Generics

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Type erasure
Generics