Question 1

-type of data structure constructed in memory.

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An array is a

Question 2

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-named set of contiguous memory cells .

Question 3

- primitive data types such as ints and doubles.

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An array can store...

Question 4

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- object data types such as Strings.

Question 5

No.

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Can data types be mixed in an array?

Question 6

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Data type must be primitive or object.

Question 7

- the square brackets [ ].

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The operator we use in creating an array is...

Question 8

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- also called the *ARRAY INDEX OPERATOR*.

Question 9

datatype [ ] arrayName;

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Array Syntax:

Question 10

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- can also be datatype arrayName [ ];

Question 11

int [ ] myIntArray = new int [10];

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To create an array to hold ten values of type int:

Question 12

No.

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Can you change the number of elements in an array after it has been created?

Question 13

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Once created, the array size is fixed, or immutable

Question 14

arrayName [index number]

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Each element of an array is identified and can be referenced using this syntax:

Question 15

The number of elements - 1.

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The last element of any array will have an index number equal to...

Question 16

9.

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If you create an array of 10 elements, the index number of the last element will be...

Question 17

Element #0

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First element =

Question 18

String[ ] surNameArray = new String [25];

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To create an array of String objects to hold 25 surnames:

Question 19

-the word "Array" at the end of the variable name to indicate that this variable is an array.

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Naming convention:

Question 20

myIntArray[0]= 5;

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To assign the first element in myIntArray with the value of five:

Question 21

By enclosing the data values inside curly braces.

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Java offers a shortcut way to declare, create and populate an array all at once...

Question 22

String [ ] monthsArray = {"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct", "Nov","Dec"};

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To create an array to hold String values representing each month of the year:

Question 23

Java will automatically assign a default value to each element.

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When array is created, how are default values assigned?

Question 24

A for loop.

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To iterate through each element of an array during processing, we often use:

Question 25

length.

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One of the data values every array holds is a variable of type int, called ________ , which stores how many elements it has.

Question 26

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*You can use this object variable in your for loop continuation condition expression. *

Question 27

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(will guarantee you never have an OutOfBoundsException)

Question 28

Using <= will send you out of bounds.

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Why do we ALWAYS use the < operator with arrayName.length?

Question 29

Starting the count at 1 would skip the first element in the array.

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Why always initialize your for loop counter to 0?

Question 30

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(it is RARE to want to skip the first element)

Question 31

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One of the library classes in the java.lang package is the Math class.

Question 32

Math.random( )

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Which do we use to generate random numbers?

Question 33

0.0000 up to 0.999999999999999.

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Math.random( ) returns a double value ranging from:

Question 34

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*Does not return 1*

Question 35

int randomInt = (int)(Math.random( ) * 10);

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How do we get int values from a method that returns a double?

Question 36

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*multiplication and typecasting*

Question 37

After multiplying by 10, add 1 to the result, then cast to an int.

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How do we change Math.random values to range from 1 and up instead of 0?

Question 38

(int)(Math.random() * (highValue - lowValue + 1) + lowValue);

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To generate int values with a lower end value of "low" and an upper end value of "high", the general formula is:

Question 39

(int)(Math.random() * (15 - 5 + 1) + 5);

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To generate 5 - 15:

Question 40

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or

Question 41

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(int)(Math.random() * (11) + 5);

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