JAVA Quiz Cognizant QE&A

The java compiler

Creates Executable

Translates java source code to byte code

Creates classes

Produces java interpreter

Java language has support for which of the following types of comment ?

Block, line and javadoc

Javadoc, literal and string

Javadoc, char and string

Single, multiple and quote

The new operator

Returns a pointer to a variable

Creates a variable called new

Obtains memory for a new variable

Tells how much memory is available

Java programs are

Platform-dependent

Interpreter-dependent

Platform-independent

Interpreter-independent

Which of the following variable declaration would not compile in Java program?

IntVAR;

Intvar1;

Int 1_var;

All are correct

Among these expressions, which is(are) of type String?

"0"

'0'

[A] and [B]

None of these

Which of the following is NOT an example of a data type?

Int

Public

Boolean

Double

What is/are highest order precedence operator(s) in Java?

()

{}

Both [A] & [B]

None of these

Which of the following is TRUE about the switch statement in Java?

A default send execution immediately to the end of the switch statement.

A break send execution immediately to the end of the switch statement.

A case send execution immediately to the end of the switch statement.

The statements in a switch continue to execute as long as the condition at the top of the switch remains true.

Which of the following is a loop construct that will always be executed once?

Switch

For

While

Do...while

The break statement causes an exit

Only from the innermost loop.

Only from the innermost switch.

From innermost loops or switches.

Terminates a program.

Which of the following is an invalid declaration for the main method in java program?

Public static void main (String [ ] args)

Public static strictfp void main(String args[ ])

Final static public void main (String args[ ])

All are Correct

A top level class may have which one of the following access modifiers?

Package

Private

Public

Protected

A subclass is also called as

Inner class

Nested class

Derived class

Hidden class

Attribute of an object can include information about

State

Method

Behaviour

Procedure

Which of the following is not a wrapper class?

Vector

Character

Boolean

Integer

Which of the following method is used to initialize the instance variable of a class?

Class

Public

Constructor

Interface

The last statement in a finalize method should always be

Super (finalize)

Super finalize()

Finalize(method name)

No restrictions

Which of the following is not true about constructors?

It initializes an object immediately upon creation

It is syntactically similar to a method

The return type of class constructor is the class type itself

All of the above

A default constructor

Has no arguments

Has no return type

Has one argument but no return type

Has two arguments

A method cannot be overridden if it is qualified by which one of the following modifier?

Final

Static

Public

None of these above

Which exception is thrown by read() method ?

Exception

FileNotFoundException

ReadException

IOException

Exception and Error are immediate subclasses of a class called

Object

Throwable

AWT

Panel

Can a protected field of a class be inherited to subclass outside the package?

Yes

How many public classes a .java file can have?

Only one

More than one but less than 3

Maximum two

No limits

Which of the following statement is false?

Variables declared inside of interface declaration may be changed by implementing class

Interfaces are designed to support dynamic method resolution at run time

When an interface method is implemented it must be declared as public

Variables declaration are implicitly final

The first statement in a java source file is,

Import statement

Package statement

Main statement

Try{} and catch{}

A package is a collection of

Classes

Interfaces

Editing tools

Classes and interfaces

Which of these class is superclass of String and StringBuffer class?

Java.util

Java.lang

Arraylist

None of these

Which of these operators can be used to concatenate two or more String objects?

Which of the following are incorrect form of StringBuffer class constructor?

StringBuffer()

StringBuffer(int size)

StringBuffer(String str)

StringBuffer(int size , String str)

Which of these method of class StringBuffer is used to concatenate the string representation to the end of invoking string?

Concat()

Append()

Join()

Concatenate()

Which of these is an incorrect Statement?

It is necessary to use new operator to initialize an array

Array can be initialized using comma separated expressions surrounded by curly braces.

Array can be initialized when they are declared.

None of the mentioned

When does Exceptions in Java arises in code sequence?

Run Time

Compilation Time

Can Occur Any time

None of these

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