24.2. Thread Concepts

[Page 710 ( continued )]

Review Questions

Sections 21.2 “21.4

21.1	Are there any compilation errors in (a) and (b)?
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21.2	What is wrong in (a)? Is the code in (b) correct?
21.3	What are the benefits of using generic types?
21.4	Can you create an instance using a generic type, for example, new E() or new E[20] ?
21.5	Since you create an instance of ArrayList of strings using new ArrayList<String>() , should the constructor in the ArrayList class be declared as public ArrayList<E>()
21.6	Can a generic class have multiple generic parameters?
21.7	How do you declare a generic type in a class? How do you declare a generic type in a method?
21.8	What is a bounded generic type?

Sections 21.5 “21.7

21.9	What is a raw type? Is GenericStack the same as GenericStack<Object> ?
21.10	What are an unbounded wildcard, a bounded wildcard, and a lower bounded wildcard?
21.11	If your program uses ArrayList<String> and ArrayList<Date> , does the JVM load both of them?
21.12	Can a method that uses a generic class parameter be static? Why?