Java Programming - 20

LIST OF ATTEMPTED QUESTIONS AND ANSWERS

 

True/False

Question Casting occurs commonly between numeric types

Correct Answer True

Your Answer True

 

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 When it knows there will be some idle time , Before it enters a memory-intense

section of code

 

Multiple Choice Single Answer

Question What are members of the threads class?

Correct Answer Method

Your Answer Method

 

True/False

Question Boolean data type have only Yes or No value.

Correct Answer True

Your Answer False

 

Select The Blank

Question The ________ loop is java's most fundamental looping statement.

Correct Answer While

Your Answer While

 

Multiple Choice Single Answer

Question In multithreaded program each part of such program is called :-

Correct Answer Thread

Your Answer Thread

 

Multiple Choice Multiple Answer

Question Which of the following are mathematical Expressions?

Correct Answer (+ +) , (+ =) , (- =)

Your Answer (+ =) , (- =)

 

True/False

Question A thread can be blocked when waiting for a resource.

Correct Answer True

Your Answer True

 

True/False

Question Each class in java can have a finalizer method.

Correct Answer True

Your Answer False

 

Multiple Choice Single Answer

Question Which statement has a the effect of "jumping out" of the switch statement?

Correct Answer Break

Your Answer Break

 

True/False

Question As abstract class must have at least one abstract method and others may be concrete or abstract.

Correct Answer True

Your Answer True

 

Multiple Choice Single Answer

Question The argument to which specifies the delayperiod in milliseconds

Correct Answer sleep( )

Your Answer sleep( )

 

Select The Blank

Question When java program starts up, one thread begin runing and it is called ________thread.

Correct Answer main( )

Your Answer main( )

 

Multiple Choice Single Answer

Question class conditional { public static void main(String args[]) { int i = 20; int j = 55; int z = 0; z

= i < j ? i : j; // ternary operator System.out.println("The value assigned is " + z); } } } What is output

of the above program?

Correct Answer The value assigned is 20

Your Answer The value assigned is 20

 

True/False

Question When for loop start the execution, the initialization portion of the loop is executed.

Correct Answer True

Your Answer True

 

Select The Blank

Question ________ variables are declared by use of the Byte Keyword.

Correct Answer Byte

Your Answer Byte

 

Multiple Choice Single Answer

Question Which cast must be used to cast an object to another class?

Correct Answer Specific cast.

Your Answer Explicit cast.

 

Multiple Choice Multiple Answer

Question Which are keywords in Java?

Correct Answer Extends , Synchronized , Sizeof

Your Answer Extends , Synchronized , Sizeof

 

Multiple Choice Multiple Answer

Question What are different data types in java?

Correct Answer char , double , byte

Your Answer char , double , byte

 

Match The Following

Question Correct Answer Your Answer

The Operators used in mathematical expressions Arithmetic Operator (= operator;)

Order in which operators are evaluated in expressions. Order of precedence Order of precedence

Whether an expression is evaluated left-to-right or right-to-left. Associativity Associativity

Java operator syntax for right associativity (= operator;) Comparison Operator

 

Multiple Choice Single Answer

Question Java uses which system to store packages?

Correct Answer File system directories

Your Answer File system directories

 

True/False

Question Constructors can be overloaded like regular methods.

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 After the new thread is created, it will not start running until you call its

________method.

Correct Answer start( )

Your Answer start( )

 

Select The Blank

Question The ________ repeats a set of code at least once before the condition is tested.

Correct Answer Do-while loop

Your Answer Do-while loop

 

Select The Blank

Question ________ loop repeats a statement or block while its controlling expressions is true.

Correct Answer While

Your Answer While

 

Match The Following

Question Correct Answer Your Answer

The data, or variable, defined within a class Instance variable. Instance variable.

General form of Cast (target--type)value (target--type)value

Determine the relationship that one operand has to the other Relational Operator Comparison

operator

The secondary versions of the Boolean AND and OR operators Short-Circuit Logical Operators

Short-Circuit Logical Operators

 

Multiple Choice Multiple Answer

Question The Bitwise Logical Operators are :-

Correct Answer ^ , ^= , <<

Your Answer ^ , <<

 

Select The Blank

Question The name of the new thread is specified by ________.

Correct Answer threadName

Your Answer Currentthread

 

Select The Blank

Question ________ is probably the least used java data type

Correct Answer short

Your Answer short

 

Multiple Choice Single Answer

Question How to change the values of the elements of the array?

Correct Answer By using array subscript expression

Your Answer By specifying index number

 

Multiple Choice Single Answer

Question What is declared within the file that will belong to the specified pacakage?

Correct Answer classes

Your Answer classes

 

Multiple Choice Single Answer

Question How many concrete classes can you have inside an interface?

Correct Answer none

Your Answer none

 

True/False

Question A thread's priority is used to decide when to switch from one running thread to the next,

this is called as the context switch.

Correct Answer True

Your Answer True

 

Select The Blank

Question A class is ________ for an objects in java.

Correct Answer Template

Your Answer Template

 

Select The Blank

Question Anonymous classes be implemented in an ________.

Correct Answer Interface

Your Answer Method

 

True/False

Question When an object is referenced, it mean that it has been identified by the finalizer method

for garbage collection.

Correct Answer False

Your Answer False

 

Multiple Choice Multiple Answer

Question Features of Java applets are :-

Correct Answer They can be transmitted over internet , Require java enabled web browser

Your Answer They can be transmitted over internet , Require java enabled web browser , They

are intelligent programs.

 

Multiple Choice Multiple Answer

Question Classes usually consist of two things such as :-

Correct Answer Instance variable , Methods

Your Answer Instance variable , Methods

 

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 , Often it must be the last

thread to finish execution because It performs various shutdown actions

 

True/False

Question If the break statement is omited in switch statement, then execution will continue on

into the next case.

Correct Answer True

Your Answer True

 

Multiple Choice Multiple Answer

Question Which are the two threads of java?

Correct Answer mainthread( ) , childthread( )

Your Answer mainthread( ) , current

 

Select The Blank

Question The ________ repeat a set of code while the condition is false.

Correct Answer While loop

Your Answer For

 

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 short s = 20; , byte b = 128;

 

Multiple Choice Multiple Answer

Question What are means of encapsulating and containing the name space and scope of

variables and methods?

Correct Answer Classes , Packages , Subclasses

Your Answer Packages , Subclasses

 

Multiple Choice Single Answer

Question How is it possible to use few methods of an interface in a class?

Correct Answer By declaring the class as abstract

Your Answer By declaring the class as abstract

 

Multiple Choice Single Answer

Question Which statement will always execute the body of a loop at least once?

Correct Answer Do

Your Answer Do