Java :What is a difference between ? super E and ? extends E?

Java :What is a difference between ? super E and ? extends E?

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Generics and Wildcards in Java | Part 2 | Invariance vs Covariance vs Contravariance | Geekific
Generics and Wildcards in Java | Part 2 | Invariance vs Covariance vs Contravariance | Geekific
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