Generic Programming - Java Concepts - page 1066

9. When calling a generic method, you need not instantiate the type variables.

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10. Type variables can be constrained with bounds.

11. The virtual machine works with raw types, not with generic classes.

12. The raw type of a generic type is obtained by erasing the type variables.

13. To interface with legacy code, you can convert between generic and raw types.

REVIEW EXERCISES

΢ Exercise R17.1. What is a type variable?

΢ Exercise R17.2. What is the difference between a generic class and an
ordinary class?

΢ Exercise R17.3. What is the difference between a generic class and a
generic method?

΢ Exercise R17.4. Find an example of a non-static generic method in the
standard Java library.

΢΢ Exercise R17.5. Find four examples of a generic class with two type
parameters in the standard Java library.

΢΢ Exercise R17.6. Find an example of a generic class in the standard library
that is not a collection class.

΢ Exercise R17.7. Why is a bound required for the type variable T in the
following method?

<T extends Comparable> int binarySearch(T[]
a, T key)

΢΢ Exercise R17.8. Why is a bound not required for the type variable E in the
HashSet<E> class?

΢ Exercise R17.9. What is an ArrayList<Pair<T, T>> ?