test2

Question 1

curly braces or the _____ _____ _____ can control the scope of a vriable

Answer 1

SCOPE INDEX OPERATORS

Question 2

what is a variable?

Answer 2

a storage location in a computer’s ram memory

Question 3

a variable has a ____ and a ____ ____ specified

Answer 3

name (identifier, reference, handle) and data type(int,String)

Question 4

what do we do when we declare a variable

Answer 4

we specify its data type and name

Question 5

what is the assignment operator

Answer 5

=

Question 6

When we declare a variable, we’re ______ the name of the variable to a particular memory location address

Answer 6

binding

Question 7

How must a Java variable identifier must start with

Answer 7

a letter, and underscore or a $ sign

Question 8

True or false: You cannot start a variable name with a digit such as 3 or 7.

Answer 8

True it causes a compile error

Question 9

is java case sensitive?

Answer 9

yes

Question 10

can you use java reserved words or keywords such as public, class or else identifiers?

Answer 10

nope compile error

Question 11

java names begin with a ____

Answer 11

lower case letter

Question 12

how is the second word in a variable name written out

Answer 12

with a capital letter, camelBack

Question 13

true or false. in java our programs statements are always contained inside a class file

Answer 13

true

Question 14

class names always start with a

Answer 14

capital letter and each new word also starts with a capital letter

Question 15

variable names start with a \_\_\_\_ case letter
class names start with a \_\_\_\_ case letter

Answer 15

lower (camelBack)

upper (title case)

Question 16

why do we specify the data type when we declare a variable?

Answer 16

tells os how many bytes of memory is needed for that variable and BC program uses data type to interpret the data that is stored

Question 17

True or false: ASCII and Unicode: first 256 values are identical

Answer 17

true

Question 18

do primitive data types have methods associated with them?

Answer 18

nope

Question 19

how many primitive data types are there in java

Answer 19

8

Question 20

what is mantissa and exponent

Answer 20

mantissa is the first part of an exponent the number that is going to be multiplied by 10 to the exponent. exponent is what it is

Question 21

is a string an object

Answer 21

yes

Question 22

what is a method in java

Answer 22

a method is some lines of code that are put in their own code block (inside their own curly braces) and this block is given a method name

Question 23

T or F: Var keyword only be used when created local variables within a method

Answer 23

True

Question 24

how are constants declared

Answer 24

with the keyword final along with its data type that it will hold

Question 25

constants can be declared on one line and initialized later on in another line

Answer 25

true

Question 26

what is a data literal

Answer 26

a data literal is an actual data value that appears in a program. its the value that is declared

Question 27

if you divide an integer by another integer does java give you an integer answer?

Answer 27

yes

Question 28

when dividing an integer literal by another integer java will do what to the decimal portion

Answer 28

truncate

Question 29

are primitive data types objects?

Answer 29

nope

Question 30

integer primitive data types

Answer 30

byte(8)m short(16), int (32), long(64)

Question 31

floating data types

Answer 31

float and double

Question 32

char is a single word

Answer 32

nope letter

Question 33

what are the binary operators

Answer 33

+ - * / %

Question 34

the answer of a modulus division operation is the ______ of value from a regular division operation

Answer 34

REMAINDER

Question 35

equals we use ___ and not equal is ____

Answer 35

== and !=

Question 36

by default a numeric literal value is assumed to be ____

Answer 36

positive

Question 37

increment operator

decrement operator

Answer 37

++

–

Question 38

True or false: An if structure is a single-selection type of structure because it either selects to carry out, or it ignores, a single action.

Answer 38

True

Question 39

should you put curly braces around every if block statement, even if there is only 1 statement to execute

Answer 39

yes, good coding style

Question 40

The logical AND indicates that both conditions must be truein order for the overall if expression to return a value of ____.

Answer 40

true

Question 41

if either condition is false, or both are false, then the overall if expression evaluates to ____

Answer 41

false

Question 42

true or false: the only way to get a true result from a logical and operation is for both conditions to be true

Answer 42

True

Question 43

Why do we use the && and || symbols when & and | seem to do the same thing?

Answer 43

The single ‘&’ AND operator is the ‘bitwise’ operator. It compares the corresponding bits of each operand to determine the overall true or false result. So, it does both comparisons, no matter what the first comparison return
but the && || will stop after reading a false value- saves a few cpu cycles

Question 44

declaring a variable

Answer 44

defining its type

Question 45

initializing a variable

Answer 45

specify the value to be stored in the variable

Question 46

4 rules of naming variables

Answer 46

1 start with letter or underscore
2. can’t use ? or %, spaces
3 variable names are case sensitive
4 you cannot use reserved words such as double or class as names

Question 47

what are two downsides of using objects such as BigDecimal and BigInteger in calculations?

Answer 47

slow and you have to call in methods called add, subtract and multiply

Question 48

what is a package and what does it contain

Answer 48

it is a collection of classes with a related purpose

Question 49

how do you tell in java code that a character should be interpreted as a character literal?

Answer 49

single quotes ‘ ‘