What is the difference between metacharacters?

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afna2015-02-22 02:09:55

Java

afna, 2015-02-22 02:09:55

What is the difference between metacharacters?

What is the difference between <? extends T> and <? super T>
According to the book "Philosophy of Java" I can not understand what is the difference between these metacharacters.
Please, explain intelligibly what these metacharacters mean and in what cases they are used?
Thank you!

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