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Computer Science > Java Basics > Flashcards

Java Basics Flashcards

1
Q

What does XXX mean in the following:

class XXX

A

Class or program name

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2
Q

What does each of these mean:

\
“\n”
“
n
Double slash
\”

A

\ = Next character is printable
“\n” = New line
“ = String Delimiter
n = Printable n
\ = Printable slash
\” = Printable

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3
Q

Any character used as an identifier must be?

A

Letter, digit, or underscore (_)

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4
Q

What can the first character in an identifier not be?

A

A digit

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5
Q

What is PascalCase and camalCase?

A

PascalCase = All the starting letters in a word are capitalized

camalCase = First letter of the first word is not capitalized but rest are

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6
Q

To which are PascalCase and camalCase conventionally assigned as?

A

PascalCase = Classes

camalCase = Variables and methods

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7
Q

For numeric data types, is it possible to convert from smaller to larger types but not reverse.

TRUE or FALSE

A

TRUE

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8
Q

What is a cast?

A

Forcing Java to make a data type conversion

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9
Q

What are constants and what are they conventionally assigned as?

A

Variables which’s values cannot be changed.

All UPPERCASE

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10
Q

What is a computer?

A

A machine that stores data (numbers, words, pictures), interacts with devices (monitors, speakers, mouse), and executes commands

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11
Q

What is programming?

A

Giving the computer a set of instructions to follow or execute

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12
Q

What is the processor in a computer responsible for?

A

Executing a variety of instructions

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13
Q

What did early model computers use to carry out translations?

A

Assembler

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14
Q

What does the assembler do?

A

Takes a sequence of characters such as iload and translates it into command code 21

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15
Q

What does a compiler do?

A

Translates high-level descriptions into machine instructions

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16
Q

In what year and who developed the coding language which they named “Green”?

A

1991 / James Gosling and Patrick Naughton at Sun Microsystems

17
Q

What could the HotJava browser download and run?

A

Applets

18
Q

In 1996, which two major companies supported Java?

A

Netscape and Microsoft

19
Q

What is an object?

A

An entity you can manipulate by calling methods

20
Q

What does every object belong to?

A

A class

21
Q

What is the process of creating an object called?

A

Construction

22
Q

What two elements does a class contain?

A

Variables and methods

23
Q

What is a instance field?

A

A variable defined in a class for which every object has its own value

24
Q

What is a variable?

A

A symbol in a class that can hold values

25
Q

What does an instance field declaration consist of?

A

An access specifier (public or private)

The type of variable (int or string)

The name of the variable

26
Q

What are the three things each variable has?

A

A name

A value

A type

27
Q

What is the name you choose for a variable known as?

A

Identifier

28
Q

What 3 things can an identifier start with?

A

A letter

An underscore

A dollar sign

29
Q

A data type has ___ basic types and can be defined in ___ categories.

A

8 and 3

30
Q

What are the 3 main categories for data types?

A

Numeric

Boolean

Characters

31
Q

What are the 2 types of numeric data types?

A

An integer with no fraction and a floating point

32
Q

What are the 4 types of integers?

A

Byte

Short

Long

Int

33
Q

What does a variable of type char hold?

A

A single character

34
Q

What do each of these mean:

\b
\t
\r

A

\b = Backspace
\t = Tab
\r= Carriage Return

35
Q

Any expression in a parenthesis is evaluated first.

TRUE or FALSE

A

TRUE

36
Q

Parenthesis can be nested, if so: the OUTERMOST expression is evaluated first.

TRUE or FALSE

A

FALSE (it is the innermost)

37
Q

What are the 2 data types for floating points?

A

Double & Float

Computer Science (5 decks)

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