Arrays

Question 1

What does an array represent?

Answer 1

Arrays represent a collection of data.

Question 2

Is an array a value type or reference type?

Answer 2

Reference type

Question 3

How do I know how many elements are in an array?

Answer 3

A single array variable can track any number of individual data items. It’s only limited by the computer’s memory.

Question 4

How do I know how many elements an array could hold?

Answer 4

By the int in the square brackets or by .length();

Question 5

How do I access an element in an array?

Answer 5

Through the array’s index.

Ex: System.out.println(planets[1]);

Question 6

If an array holds ten elements, what happens if I try to access the 12th element?

Answer 6

An index that is greater than or equal to the length of the array will cause a run-time failure. A negative index will causes a run-time failure.

Question 7

Are array elements value or reference types?