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CSC1301 > Basic Java Program > Flashcards

Basic Java Program Flashcards

1
Q

Identifier:

A

A name given to an item in your program.

  • must start with a letter or _ or $
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2
Q

What are examples of legal names for a program?

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

What are examples of illegal names for a program?

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

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

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

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

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

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

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

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

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

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

A
  1. this
  2. throw
  3. throws
  4. transient
  5. try
  6. void
  7. volatile
  8. while
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9
Q

define escape sequence:

A

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

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10
Q

\t represents:

A

tab character

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11
Q

\n represents:

A

new line character

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12
Q

" represents

A

quotation mark character

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13
Q

\ represents

A

backslash character

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14
Q

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

A
  1. //

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

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15
Q

define type:

A

A category or set of data values

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16
Q

define int:

A

integers to 2^31

Examples:
42, -3, 0, 926394

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17
Q

define double:

A

real numbers to 10^308

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

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18
Q

define char:

A

single text characters

Examples:
‘a’, ‘x’, ‘?’, ‘\n’

19
Q

define boolean:

A

logical values

Examples:
True, false

20
Q

define operator:

A

combines multiple values or expressions

21
Q

define the operator /

A

division

22
Q

define the operator %

A

modulus (a.k.a. remainder)

23
Q

What code is necessary to accept user input?

A

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

Scanner Dev = new Scanner (System.in);

24
Q

Define Scanner class method: nextDouble();

A

Retrieves input as a double

25
Q

Define Scanner class method: nextInt();

A

Retrieves input as an int

26
Q

Define Scanner class method: nextLine();

A

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

27
Q

Define Scanner class method: next();

A

Retrieves the next complete token as a String

28
Q

Define scope:

A

The part of a program where a variable exists.

  • From its declaration to the end of the { } braces
29
Q

Math.abs (value) represents:

A

absolute value

30
Q

Math,ceil (Value) represents:

A

rounds up

31
Q

Math.floor (Value) represents:

A

rounds down

32
Q

Math.max (Value1, value2)

represents:

A

larger of two values

33
Q

Math.min (value1, value2) represents:

A

smaller of two values

34
Q

Math.random () represents:

A

random double between -0 and 1

35
Q

Math.round (value) represents:

A

nearest whole number

36
Q

What is operator == represent?

A

Equals

Ex. 1 + 1 == 2/TRUE

37
Q

What is operator != represent?

A

Does not equal

Ex. 3.2 != 2.5/TRUE

38
Q

What is operator < represent?

A

less than

Ex. 10 < 5/FALSE

39
Q

What is operator > represent?

A

Greater than

Ex. 10 > 5/ TRUE

40
Q

What is operator <= represent?

A

less than or equal to

Ex. 126 <= 100/FALSE

41
Q

What is operator >= represent?

A

greator than or equal to

Ex. 5.0 >= 5.0/TRUE

42
Q

&& operator represents:

A

and

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

43
Q

|| operator represents:

A

or

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

44
Q

! operator represents:

A

not

Ex. !(2 == 3) TRUE

CSC1301 (2 decks)

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