Data Types & Operators

Question 1

Primitive Integer Types

Answer 1

4 - byte, short, int, long

Question 2

Primitive Floating-Point Types

Answer 2

2 - float, double

Question 3

Primitive Non-Numeric Types

Answer 3

2 - char, boolean

Question 4

Number of Primitive Types

Answer 4

8

Question 5

Bits & Range: byte

Answer 5

8 bits

-128 to 127

Question 6

Bits & Range: short

Answer 6

16 bits

-32768 to 32767

Question 7

Bits & Range: int

Answer 7

32 bits

-2,147,483,648 to 2,147,483,647

Question 8

Bits & Range: long

Answer 8

64 bits

-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807

Question 9

char assignment uses what kind of quotes

Answer 9

Single quotes

Question 10

Operator for testing Boolean values

Answer 10

==

Question 11

Literals

Answer 11

Fixed values (constants) of any primitive type

Default is int

Postfix l or L for long or f or F for Float - 12L, 10.19f

Question 12

Octal Literals

Answer 12

Number system based on 8, using digits 0-7

Question 13

Hexadecimal Literals

Answer 13

Base 16 number system, using digits 0-9 plus A-F (10-15)

Prefix 0X or 0x

Question 14

Binary Literals

Answer 14

Binary number

Prefix 0B or 0b

Question 15

String Literals

Answer 15

A set of characters enclosed in double quotes

Question 16

Escape Sequences

Answer 16

A sequence of characters that does not represent itself when used inside a character or string literal, but is translated to a formatting specifier or character that is hard to represent. Backslash prefix.

Question 17

'
"
\

Answer 17

Single quote
double quote
Backslash escape sequence

Question 18

\t
\r
\b

Answer 18

Tab
Carriage Return
Backspace Escape Sequence

Question 19

\n

Answer 19

New line Escape Sequence

Question 20

\f

Answer 20

Form feed escape sequence- page break

Question 21

Variable Declaration

Answer 21

type variableName;

Question 22

Variable Initialization

Answer 22

type varName = value;

Question 23

Dynamic variable initialization

Answer 23

type varName = expression;

Question 24

Types of Scope

Answer 24

Class

Method

Question 25

Nested Scope Visibility: Outer Scope vs. Inner scope

Answer 25

Outer scope variables are visible to inner scope, but not vice versa.

Question 26

Variable creation & destruction timeline

Answer 26

Variables are created when their scope is entered & destroyed when their scope is left.

Question 27

Will a variable hold its value outside of its scope?

Answer 27

No

Question 28

Will a method variable hold its value between calls to the method?

Answer 28

No

Question 29

Variable lifetime limitation

Answer 29

Its scope

Question 30

Can a variable declared in an inner scope have the same name as one declared in the outer scope?

Answer 30

No

Question 31

Logical Operator: OR, AND

Answer 31

|

&

Question 32

Logical Operator:
XOR (Exclusive Or)
Not

Answer 32

!

Question 33

Short-Circuit Logical Operators
OR
AND

Answer 33

Evaluate the second operant only when necessary
||
&&

Question 34

Shorthand Increment Operator:

x+=10;

Answer 34

X = x + 10

Question 35

What is Automatic type conversion?

Answer 35

Right value is converted to left side type

Question 36

When does automatic type conversion take place?

Answer 36

When the two types are compatible & the destination type is larger than the source type.

Question 37

Which primitives have no automatic type conversion?

Answer 37

Char & boolean

Question 38

What is a cast?

Answer 38

An explicit instruction to convert one type into another.

Question 39

Cast syntax

Answer 39

(target type) expression

Question 40

Can you mix different types in an expression?

Answer 40

Yes, as long as they are compatible

Question 41

Type Promotion Rules: what primitives convert to int when included with an int in an expression?

Answer 41

Char, byte, short

Question 42

Precedence of Type Promotion for double, long & float

Answer 42

Long
Float
Double

Question 43

Should you rely on type Promotion or casting?

Answer 43

Casting is more reliable than type promotion rules