Basic Java Program

Question 1

Identifier:

Answer 1

A name given to an item in your program.

• must start with a letter or _ or $

Question 2

What are examples of legal names for a program?

Answer 2

1. _myName
2. TheCure
3. ANSWER_IS_42
4. $bling$

Question 3

What are examples of illegal names for a program?

Answer 3

1. me+u
2. 49ers
3. side-swipe
4. Ph.D’s

Question 4

List out keywords in java that cannot be used as an identifier (a - c):

Answer 4

1. abstract
2. boolean
3. break
4. btye
5. case
6. catch
7. char
8. class
9. const
10. continue

Question 5

List out keywords in java that cannot be used as an identifier (d - g):

Answer 5

1. default
2. do
3. double
4. else
5. extends
6. final
7. finally
8. float
9. for
10. goto

Question 6

List out keywords in java that cannot be used as an identifier (i - n):

Answer 6

1. if
2. implements
3. import
4. instanceof
5. int
6. interface
7. long
8. native
9. new

Question 7

List out keywords in java that cannot be used as an identifier (p - s):

Answer 7

1. package
2. private
3. protected
4. public
5. return
6. short
7. static
8. strictfp
9. super
10. switch
11. synchronized

Question 8

List out keywords in java that cannot be used as an identifier (t - w):

Answer 8

1. this
2. throw
3. throws
4. transient
5. try
6. void
7. volatile
8. while

Question 9

define escape sequence:

Answer 9

A special sequence of characters used to represent certain special characters in a string.

Question 10

\t represents:

Answer 10

tab character

Question 11

\n represents:

Answer 11

new line character

Question 12

" represents

Answer 12

quotation mark character

Question 13

\ represents

Answer 13

backslash character

Question 14

What are the two ways to make comments in a code?

Answer 14

1. //

2. /* (to start) and */ (to end)

Question 15

define type:

Answer 15

A category or set of data values

Question 16

define int:

Answer 16

integers to 2^31

Examples:
42, -3, 0, 926394

Question 17

define double:

Answer 17

real numbers to 10^308

Examples:
3.1, -0,25, 9, 9.4

Question 18

define char:

Answer 18

single text characters

Examples:
‘a’, ‘x’, ‘?’, ‘\n’

Question 19

define boolean:

Answer 19

logical values

Examples:
True, false

Question 20

define operator:

Answer 20

combines multiple values or expressions

Question 21

define the operator /

Answer 21

division

Question 22

define the operator %

Answer 22

modulus (a.k.a. remainder)

Question 23

What code is necessary to accept user input?

Answer 23

Scanner (input name) = new Scanner(System,in);

Scanner Dev = new Scanner (System.in);

Question 24

Define Scanner class method: nextDouble();

Answer 24

Retrieves input as a double

Question 25

Define Scanner class method: nextInt();

Answer 25

Retrieves input as an int

Question 26

Define Scanner class method: nextLine();

Answer 26

Retrieves the next line of data and returns it as a String

Question 27

Define Scanner class method: next();

Answer 27

Retrieves the next complete token as a String

Question 28

Define scope:

Answer 28

The part of a program where a variable exists. - From its declaration to the end of the { } braces

Question 29

Math.abs (value) represents:

Answer 29

absolute value

Question 30

Math,ceil (Value) represents:

Answer 30

rounds up

Question 31

Math.floor (Value) represents:

Answer 31

rounds down

Question 32

Math.max (Value1, value2) | represents:

Answer 32

larger of two values

Question 33

Math.min (value1, value2) represents:

Answer 33

smaller of two values

Question 34

Math.random () represents:

Answer 34

random double between -0 and 1

Question 35

Math.round (value) represents:

Answer 35

nearest whole number

Question 36

What is operator == represent?

Answer 36

Equals Ex. 1 + 1 == 2/TRUE

Question 37

What is operator != represent?

Answer 37

Does not equal Ex. 3.2 != 2.5/TRUE

Question 38

What is operator < represent?

Answer 38

less than Ex. 10 < 5/FALSE

Question 39

What is operator > represent?

Answer 39

Greater than Ex. 10 > 5/ TRUE

Question 40

What is operator <= represent?

Answer 40

less than or equal to Ex. 126 <= 100/FALSE

Question 41

What is operator >= represent?

Answer 41

greator than or equal to Ex. 5.0 >= 5.0/TRUE

Question 42

&& operator represents:

Answer 42

and Ex. (2 == 3) && (-1 < 5) FALSE

Question 43

|| operator represents:

Answer 43

or Ex. (2 == 3) || ((-1 < 5) TRUE

Question 44

! operator represents:

Answer 44

not Ex. !(2 == 3) TRUE