Chapter 1 - Objects and classes

Question 1

when naming these they always begin with a lower case letter

Answer 1

what is the convention for naming
objects

Question 2

chapter 1 glossary quiz

Answer 2

view link

Question 3

describe a
class

Answer 3

is a category or type of something that will have characteristics

Question 4

an object is an instance of a class

Answer 4

describe an
instance

Question 5

these include
* byte (1 byte)
* short (2 bytes)
* int (4 bytes)
* long (8 bytes)

Answer 5

what are the 4
integer primitive types
and their size in bytes

Question 6

these include
* float (4 bytes)
* double (8 bytes)

Answer 6

what are the 2
real number primitive types
and their size in bytes

Question 7

describe in 3 points javas
object type

Answer 7

• these are created by the user
• when held in a variable only a reference to the original is stored, a copy of the variable will also reference the same original
• changes made to any reference will be reflected on all references

Question 8

this is the act of converting a smaller type to a larger type size
byte -> short -> char -> int -> long -> float -> double

Answer 8

describe
widening casting
and the order of types

Question 9

this is the act of having many instances from a single class. Each instance is an object that can change its state by adjusting the values of its fields

Answer 9

describe
multiple instances

Question 10

double myDouble = 9.78d;
int myInt = (int) myDouble; // Manual casting: double to int

Answer 10

manually cast a double to an int

Question 11

what is type casting

Answer 11

this is when you assign a value of one primitive data type to another type.

Question 12

is a category or type of something that will have characteristics

Answer 12

describe a
class

Question 13

manually cast a double to an int

Answer 13

double myDouble = 9.78d;
int myInt = (int) myDouble; // Manual casting: double to int

Question 14

describe in 3 points javas
primitive data types

Answer 14

• these are predefined data types of Java. They specify the size and type of any standard values
• these are not associated with classes and so have no methods
• when this is declared in a variable it is stored directly, if the variable is copied then another copy is created

Question 15

describe an
object

Answer 15

is a specific entity of a class that will have the characteristics of its class but will be specific to this object

Question 16

• these are created by the user
• when held in a variable only a reference to the original is stored, a copy of the variable will also reference the same original
• changes made to any reference will be reflected on all references

Answer 16

describe in 3 points javas
object type

Question 17

the car is a class because we cannot answer questions about a particular car
such as
* what colour is the car
* what horse power is the car

Answer 17

why is car a class and not an object

Question 18

these include
* char (2 bytes)
* boolean (1 bit)

Answer 18

what are the 2
other primitive types
and their size

Question 19

what are the 2
real number primitive types
and their size in bytes

Answer 19

these include
* float (4 bytes)
* double (8 bytes)

Question 20

what are the 4
integer primitive types
and their size in bytes

Answer 20

these include
* byte (1 byte)
* short (2 bytes)
* int (4 bytes)
* long (8 bytes)

Question 21

describe
widening casting
and the order of types

Answer 21

this is the act of converting a smaller type to a larger type size
byte -> short -> char -> int -> long -> float -> double

Question 22

describe
multiple instances

Answer 22

this is the act of having many instances from a single class. Each instance is an object that can change its state by adjusting the values of its fields

Question 23

what are the 2
other primitive types
and their size

Answer 23

these include
* char (2 bytes)
* boolean (1 bit)

Question 24

describe
narrowing casting
and the order of types

Answer 24

this is the act of converting a larger type to a smaller size type
double -> float -> long -> int -> char -> short -> byte

Question 25

when naming these they always begin with a capital letter

Answer 25

what is the convention for naming classes

Question 26

is a specific entity of a class that will have the characteristics of its class but will be specific to this object

Answer 26

describe an
object

Question 27

what are the two types of
casting
in java and how does it occur

Answer 27

this feature includes
* widening casting (occurs automatically)
* narrowing casting (occurs manualy)

Question 28

what are the two data types found in java

Answer 28

these include
* primitive types
* object types

Question 29

what is the convention for naming classes

Answer 29

when naming these they always begin with a capital letter

Question 30

• these are predefined data types of Java. They specify the size and type of any standard values
• these are not associated with classes and so have no methods
• when this is declared in a variable it is stored directly, if the variable is copied then another copy is created

Answer 30

describe in 3 points javas
primitive data types

Question 31

this is when you assign a value of one primitive data type to another type.

Answer 31

what is type casting

Question 32

this is made up of
fields
and
methods

Answer 32

what is inside an
object

Question 33

what is inside an
object

Answer 33

this is made up of
fields
and
methods

Question 34

describe an
instance

Answer 34

an object is an instance of a class

Question 35

why is car a class and not an object

Answer 35

the car is a class because we cannot answer questions about a particular car
such as
* what colour is the car
* what horse power is the car

Question 36

this feature includes
* widening casting (occurs automatically)
* narrowing casting (occurs manualy)

Answer 36

what are the two types of
casting
in java and how does it occur

Question 37

what is the convention for naming
objects

Answer 37

when naming these they always begin with a lower case letter

Question 38

view link

Answer 38

chapter 1 glossary quiz

Question 39

this is the act of converting a larger type to a smaller size type
double -> float -> long -> int -> char -> short -> byte

Answer 39

describe
narrowing casting
and the order of types

Question 40

these include
* primitive types
* object types

Answer 40

what are the two data types found in java