Class as the Basis of all Computation

Question 1

define software object

Answer 1

an object that is created while writing a java program. characteristics are data members, and behaviour are member functions

Question 2

define class

Answer 2

a class is a blueprint or template for objects that describes characteristics and behaviourwh

Question 3

why is object instance of a class

Answer 3

an object includes the instance variables described within the class

Question 4

use of new keyword

Answer 4

to allocate space in the dynamic memory for storage of data and functions

Question 5

define instantiation

Answer 5

when an object of a class is created

Question 6

ways of programming by using a class

Answer 6

1. with main function
2. without main function

Question 7

contents of class

Answer 7

1. external wrapper (class declaration)
2. internal contents

Question 8

parts of internal contents in class

Answer 8

1. access specifiers
2. instance variable
3. local variable
4. class variable
   5 constructors
5. member methods

Question 9

elements of external wrapper

Answer 9

1. class
2. class name

Question 10

define access specifiers

Answer 10

terms used to specify the extent of usage of the class members in the program

Question 11

features of instance variables

Answer 11

1. variables declared within the class but outside member methods
2. same set of instance variables can be used for all objects of the class
3. instance variables are fields of an object
4. instance variables belonging to different objects have different values

Question 12

class variables/static variables and instance variables difference

Answer 12

instance: no static keyword, variables are the individual copies of each object
static: static keyword, variables are a common copy for each object

Question 13

features of local variable

Answer 13

1. declared within the body of a method
2. can never be static
3. scope is limited within curly braces of the method in which they are declared
4. they are not given initial default values

Question 14

features of member methods

Answer 14

1. also called member functions
2. declared public or private
3. basically used to handle class instance variables
4. may be parameterized to return outcome

Question 15

define static data member

Answer 15

a static data member is a class variable which is global in the class and used commonly by all the objects of that class type

Question 16

static data member count is initialized with?

Answer 16

default value 0

Question 17

define static member method

Answer 17

uses only static data members

Question 18

what is ‘this’ keyword

Answer 18

when it is required to use the object in a member method through which it is called