Deck 3: Java Programming: Data Types, Inheritance, Interfaces, Packages, and Exception Handling

Question 1

A primitive data type can be passed as an argument into a method

A)By value
B)by reference
C)both a & b
D)none of these

Answer 1

By value

Question 2

Which of these is used as default for a member of a class if no access specifier is used for it?

A)private
B)public
C)public, within its own package
D)protected

Answer 2

public, within its own package

Question 3

Which of these keywords is used to refer to member of base class from a sub class?

A)upper
B)super
C)this
D)None of the mentioned

Answer 3

super

Question 4

Which of these is correct way of inheriting class A by class B?

A)class B + class A {}
B)class B inherits class A {}
C)class B extends A {}
D)class B extends class A {}

Question 5

Which of the following are true about interfaces.

A)Methods declared in interfaces are implicitly private.
B)Variables declared in interfaces are implicitly public, static, and final.
C)An interface contains any number of method definitions.
D)The keyword implements indicate that an interface inherits from another.

Question 6

Which of these keywords is used to define interfaces in Java?

A)interface
B)Interface
C)intf
D)implements

Question 7

Which of these can be used to fully abstract a class from its implementation?

A)Objects
B)Packages
C)Interfaces
D)None of the Mentione

Question 8

Which of these access specifiers can be used for an interface?

A)Public
B)Protected
C)private
D)All of the mentioned

Question 9

Which of these keywords is used by a class to use an interface defined previously?

A)import
B)Import
C)implements
D)Implements

Question 10

Which of the following is correct way of implementing an interface salary by class manager?

A)class Manager extends salary {}
B)class Manager implements salary {}
C)class Manager imports salary {}
D)None of the mentioned

Question 11

The keyword used to create a package is

A)import
B)package
C)classpath
D)public

Question 12

The modifier which specifies that the member can only be accessed in its own class is

A)public
B)private
C)protected
D)None of above

Question 13

Which of the following package stores all the standard java classes?

A)lang
B)java
C)util
D)java.packages

Question 14

Which of these is a mechanism for naming and visibility control of a class and its content?

A)Object
B)Packages
C)Interfaces
D)None of the Mentioned

Question 15

Which of this access specifies can be used for a class so that its objects can be created by a different class in another package?

A)Public
B)Protected
C)No Modifier
D)All of the mentioned

Question 16

Which of the following is correct way of importing an entire package 'pkg'?

A)import pkg.
B)Import pkg.
C)import pkg.*
D)Import pkg.*

Question 17

Which of the following is incorrect statement about packages?

A)Package defines a namespace in which classes are stored.
B)A package can contain other package within it.
C)Java uses file system directories to store packages.
D)A package can be renamed without renaming the directory in which the classes are stored.

Question 18

Which of these method of class String is used to extract a single character from a String object?

A)CHARAT()
B)chatat()
C)charAt()
D)ChatAt()

Question 19

Which of these method of class String is used to obtain length of String object?

A)get()
B)Sizeof()
C)lengthof()
D)length()

Question 20

Which of these keywords is not a part of exception handling?

A)try
B)finally
C)thrown
D)catch

Question 21

The code within the ----------- block will always be executed whether or not an exception is thrown.

A)try..catch
B)finally
C)throw
D)throws

Question 22

Which of these keywords must be used to monitor for exceptions?

A)try..catch
B)finally
C)throw
D)throws

Question 23

Which of these keywords is used to manually throw an exception?

A)try
B)finally
C)throw
D)catch

Question 24

Which of these classes is related to all the exceptions that can be caught by using catch?

A)Error
B)Exception
C)None of these
D)a & b

Question 25

Which of these classes is related to all the exceptions that cannot be caught?

A)Error
B)Exception
C)None of these
D)a & b