Chapter 8

Question 1

What is an Array?

Answer 1

• Named list of data items with the same data type
• Each data item is an element of the array

Question 2

How do you name an array?

Answer 2

• Provide any legal identifier
• Same naming conventions as variables

Question 3

What does int[] someNums; or int[] someNums = null;

Answer 3

• No computer memory adress is assigned
• The array has the special value null

Question 4

What do array names represent?

Answer 4

• Computer memory adress

Question 5

What is a instance variable for arrays?

Answer 5

• A fielt automatically assigned a value for every array you create
• Length field

Question 6

What is a flag?

Answer 6

• A variable that holds a value as an indicator of whether or not a condition has been met

Question 7

What happens if you pass a whole array into a method?

Answer 7

The array can change

Question 8

What does the length field return in a two-dimensional array?

Answer 8

How many rows

Question 9

What are jagged arrays?

Answer 9

• Rows of different lengths
• Also called ragged array or non-rectangular array
• Define number of rows, but not columns

Question 10

How do you use the arrays class?

Answer 10

Import java.util.Arrays

Question 11

What are the Array class methods?

Answer 11

BinarySearch()
equals()
fill()
sort() * Ascending
ParrelelSort *Ascending

Question 12

What are Enumerations?

Answer 12

• Finite set of legal values
• Constants are all uppercase
• no equals
• no Quotes

Question 13

What are the enum methods?

Answer 13

toString()
Ordinal() * position
equals() * tests if two enums are equal

compare() * returns a value based on ordinal value

valueOf() accepts a string aprameter and returns an enum

value() returns an array of the enums