Exam 2 (2011)

Question 1

Name one class discussed in class that is immutable.

Answer 1

Strings

Question 2

When should we define a method as static?

Answer 2

If it makes no reference to instance variables.

Question 3

What is the default value of reference instance variables of a class?

Answer 3

null

Question 4

When is space for a local integer variable allocated and when is it recovered?

Answer 4

Allocated: when the method is called; recovered: when the method finishes

Question 5

Why do we never use == to compare floating point numbers?

Answer 5

Because floating point numbers are approximations

Question 6

When is the finally block associated with exceptions executed?

Answer 6

Always

Question 7

In which area of memory are objects created?

Answer 7

Heap

Question 8

When should we define a constant as a static constant? In other words, when should we use
static final vs. final while defining a constant?

Answer 8

We should use static when all instances of the class will use the same constant value