Finals Study

Question 1

How many bits in a byte

Answer 1

8 bits

Question 2

Name 2 character encoding standards

Answer 2

ASCII and Unicode

Question 3

How many characters can ASCII handle

Answer 3

256 characters

Question 4

How many characters can Unicode handle

Answer 4

65,536 characters (256^2)

Question 5

What is a byte’s address

Answer 5

the numbered location where the byte resides

Question 6

what kind of code can a CPU execute

Answer 6

machine code

Question 7

is machine code a low or high level language

Answer 7

machine code is considered “low-level” language

Question 8

what is an algorithm

Answer 8

a finite sequence of instructions for solving a problem or performing a task

Question 9

How are algorithms typically expressed

Answer 9

in English of pseudocode

Question 10

how to create a new scanner

Answer 10

Scanner keyboard = new Scanner(System.in);

Question 11

name the primitive data types:

Answer 11

int, double, boolean, char, float, long, short

Question 12

is java case sensitive

Answer 12

yes

Question 13

what are the arithmetic operators

Answer 13

+, -, *, /

Question 14

what is an example of an assignment variable

Answer 14

=

Question 15

what are the compound assignment operators

Answer 15

+=, -=, *=, /=, %=

Question 16

what is a conditional ternary operator

Answer 16

?

Question 17

incrementing/ decrementing operators

Answer 17

++, –

Question 18

what are the logical operators

Answer 18

!, &&, ||

Question 19

what are the relational operators

Answer 19

<=, >=, ==. !=, <, >

Question 20

do switch statements require a default statement

Answer 20

nope

Question 21

how do conditional ternary operators work

Answer 21

condition ? implement if true : implement if false

Question 22

what CANNOT a controlling expression be in a switch statement

Answer 22

a floating point number or a range

Question 23

anything you can do with a for loop, you can do for a while loop and…

Answer 23

vice versa applies as well

Question 24

are instance variables usually set as public or private

Answer 24

private

Question 25

why do we need getter/accessor methods

Answer 25

to access the private instance variables

Question 26

what do setter/mutator methods do

Answer 26

change the values of the private instance variables

Question 27

what does private instance variables do

Answer 27

preserves the state of an object

Question 28

in the UML class diagrams, what does the minus sign represent

Answer 28

represents private

Question 29

in the UML class diagrams, what does the plus sign represent

Answer 29

represents public

Question 30

when does an external method call occur

Answer 30

when a method is called outside of its class

Question 31

what is a non static method call

Answer 31

object followed by a dot followed by the method call String name = s.getName();

Question 32

what is a static method call

Answer 32

class name followed by dot followed by method call double result = Math.log();

Question 33

what do variables do in classes

Answer 33

store data

Question 34

what do methods do in classes

Answer 34

perform actions

Question 35

can you use == or != with null values

Answer 35

yes because null values still have memory addresses

Question 36

can you change values declared at static final

Answer 36

no they are considered constants and cannot be changed

Question 37

can you change values declared at static

Answer 37

yes

Question 38

what are static variables also called

Answer 38

class variables

Question 39

what are static/instance variables also called

Answer 39

fields or data members

Question 40

do wrapper classes have default constructors or set methods

Answer 40

nope

Question 41

methods are blocks of code that should be

Answer 41

used and reused