Ch 5 Questions #1

Enhancing classes

1. Describe a null reference. How is a null reference implemented?

2. Describe the keyword "this" and its use in Java. Give an example.

3. What is the difference between a reference to a primitive type and a reference to an object?

4. Describe an alias? How does an alias relate to the difference between a reference to a primitive type versus an object?

5. Describe a situation where you might wish to pass an object as a parameter in a method.