Introduction to Java Programming and Data Structures, Comprehensive Version Plus MyProgrammingLab with Pearson EText -- Access Card Package
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Chapter 19.7, Problem 19.7.2CP
Program Plan Intro

Wildcard Generic Types:

The question mark (?) in generic method is known as wildcard generic type. It represents unknown type. This type can be used in function, parameters, or local variable. It can divide into three types. They are unbounded wildcard, bounded wildcard, and lower bound wildcard.

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