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Exercises
Like this article? We recommend
Like this article? We recommend
Like this article? We recommend
Exercises
To reinforce your understanding of this series’ content , work through the following exercises. You'll find the answers in the code file that accompanies this article:
- Define generics.
- What Java version introduced generics?
- Define generic type.
- How do you syntactically express a generic type?
- Identify four Java APIs that have been retrofitted to support generics.
- Define type parameter, parameterized type, and actual type argument.
- Identify the five kinds of actual type arguments supported by generics.
- Define raw type. Why are raw types supported?
- What is the rationale for using generics?
- What is an unchecked warning message and how do you suppress it?
- How do you specify a single upper bound for a type parameter? How do you specify multiple upper bounds?
- Can you specify a lower bound for a type parameter? If so, how do specify the lower bound?
- Define recursive type bound. Provide an example.
- What is the scope of a type parameter?
- State the fundamental rule of generic types and explain what this rule means.
- How would you modify outputStack(Stack<Object> stack) so that you can output the contents of a Stack instance regardless of its element type?
- Can you supply an upper or lower bound to the wildcard argument? If so, how do you accomplish this task?
- Define generic method.
- What happens when the compiler encounters an array-creation expression involving a type parameter or actual type argument?
- Define reification. Are arrays reified? Are generic types reified?
- Define erasure.
- Why isn't it possible to specify array-creation expressions with type parameters or actual type arguments?