Java Programming - 15

LIST OF ATTEMPTED QUESTIONS AND ANSWERS

Question: Java defines two ways when instantiating an object, such as :-
Correct Answer: Can implement the runnable interface , Can extend
the thread class
Your Answer: Can implement the runnable interface , Can extend the
thread class , New class

True/False
Question: Java allows loops to be nested.
Correct Answer: True
Your Answer: True

Multiple Choice Single Answer
Question: If omit the package statement, which names are put into
defualt pacakge?
Correct Answer: class
Your Answer: method

True/False
Question: The switch statement does not require a break.
Correct Answer: False
Your Answer: False

Multiple Choice Single Answer
Question: What is a data structure that controls the state of a
collection of threads as a whole?
Correct Answer: Thread group
Your Answer: Exceptions

Multiple Choice Multiple Answer
Question: Main thread is important for which two reasons?
Correct Answer: It is thread from which other "child" thread will be
swapped , Often it must be the last thread to finish execution because
It performs various shutdown actions
Your Answer: It is thread from which other "child" thread will be
swapped , It is current thread

Select The Blank
Question: For externalizable objects the ________ is solely
responsible for the external format of its contents.
Correct Answer: Class
Your Answer: Method

Multiple Choice Multiple Answer
Question: Which are keywords in Java?
Correct Answer: Extends , Synchronized , Sizeof
Your Answer: Extends , Synchronized

True/False
Question: Transient variable is variable that may not be serialized.
Correct Answer: True
Your Answer: False

True/False
Question: A thread can be blocked when waiting for a resource.
Correct Answer: True
Your Answer: True

Multiple Choice Multiple Answer
Question: What are different modifiers?
Correct Answer: Private , Protected , Final
Your Answer: Private , Protected

Select The Blank
Question: The explicit drop of an object reference by setting the
value of a variable, whose data type is a reference type of ________.
Correct Answer: Null
Your Answer: Null

Match The Following
Question Correct Answer Your Answer
The data, or variable, defined Instance variable. Instance variable.
within a class
General form of Cast (target--type)value (target--type)value
Determine the relationship that Relational Operator Relational Operator
The secondary versions of the Short-Circuit Logical Operators Logical Operator
Boolean AND and OR operators

True/False
Question: With java Type Casts are checked at both compile-time and
runtime.
Correct Answer: True
Your Answer: False

Multiple Choice Single Answer
Question: Which statement provides an easy way to dispatch execution
to different parts of your code based on the value of an expression?
Correct Answer: Switch
Your Answer: Switch

Multiple Choice Multiple Answer
Question: What all the run( ) method can do?
Correct Answer: Can call other method , Declare variable
Your Answer: Can call other method , Declare variable , Create
object

Multiple Choice Single Answer
Question: How many types of literals are there?
Correct Answer: Number literals, character literals, boolean
literals, string literals, etc.
Your Answer: Only boolean and string literals

Multiple Choice Single Answer
Question: What is an array?
Correct Answer: It is value collection of same type of data type
Your Answer: It is value collection of same type of data type

Multiple Choice Multiple Answer
Question: Which of these lines of code will compile?
Correct Answer: short s = 20; , char c = 32; , double d = 1.4;
Your Answer: byte b = 128; , char c = 32;

Multiple Choice Single Answer
Question: How do you assign values to variables?
Correct Answer: By using the assignment operator =.
Your Answer: By using the assignment operator =.

Select The Blank
Question: ________ is the logical construct upon which the entire
java language is built.
Correct Answer: Class
Your Answer: Method

Multiple Choice Single Answer
Question: How multidimensional array is declared?
Correct Answer: int[4] [5];
Your Answer: int[4] [5];

True/False
Question: The for statement loop can be infinite.
Correct Answer: True
Your Answer: True

Select The Blank
Question: ________ are stored in hierarchical manner.
Correct Answer: Packages
Your Answer: Packages

Multiple Choice Multiple Answer
Question: When might your program wish to run the garbage collector?
Correct Answer: Before it enters a compute-intense section of code ,
Before it enters a memory-intense section of code , When it knows there
will be some idle time
Your Answer: Before it enters a memory-intense section of code ,
When it knows there will be some idle time , Before objects are finalized

Multiple Choice Multiple Answer
Question: Which of the following are mathematical Expressions?
Correct Answer: (+ +) , (+ =) , (- =)
Your Answer: (+ +) , (- +)

Multiple Choice Single Answer
Question: What is a string?
Correct Answer: A combination of characters called as string
Your Answer: A combination of characters called as string

Multiple Choice Single Answer
Question: What is meant by garbage collection?
Correct Answer: Object is no longer referred to by any variable
Your Answer: Object is no longer referred to by any variable

True/False
Question: Casting occurs commonly between numeric types
Correct Answer: True
Your Answer: False

Select The Blank
Question: ________ is an instance of a class that implements the
runnable interface.
Correct Answer: threadOb
Your Answer: threadA

True/False
Question: Integer can Cast to byte value.
Correct Answer: False
Your Answer: True

Match The Following
Question Correct Answer Your Answer
Derived class Subclass of protection Superclass
Class Interface Directories
Packages Directories Excpetion
Specifier Protected Protected

True/False
Question: A thread can be preempted by a higher priority thread.
Correct Answer: True
Your Answer: True

Multiple Choice Multiple Answer
Question: By Providing the interface keyword, Java allows you to
fully utilize the which aspect of polymorphism?
Correct Answer: One interface , Multiple methods
Your Answer: One interface , Multiple methods , Derived

Select The Blank
Question: Anonymous classes be implemented in an ________.
Correct Answer: Interface
Your Answer: Interface

True/False
Question: Interface can be extended.
Correct Answer: True
Your Answer: False

Multiple Choice Multiple Answer
Question: There are two distinct types of multitasking. Which are
those?
Correct Answer: Process based , Thread-base
Your Answer: Process based , Thread-base

Multiple Choice Single Answer
Question: Java provides built-in support for which programming?
Correct Answer: Multithreaded
Your Answer: Multithreaded

Multiple Choice Single Answer
Question: The argument to which specifies the delayperiod in
milliseconds
Correct Answer: sleep( )
Your Answer: sleep( )

True/False
Question: The switch differs from the if in that switch can only
test for equality, whereas if can evaluate any type of Boolean expression.
Correct Answer: True
Your Answer: True

Select The Blank
Question: ________ is referred by a variable candidate for garbage
collection when the variable goes out of scope.
Correct Answer: Objects
Your Answer: Class