JAVA

Which feature of Java makes it possible to run a Java program on different platforms?

2 Mark(s)

Object-Oriented
Platform-Independent
Syntax
Memory Management

Which of the following is a superclass of every class in Java?

2 Mark(s)

ArrayList
Abstract class
Object class
String

Which of these are selection statements in Java?

2 Mark(s)

break
continue
for()
if()

Which exception is thrown when java is out of memory?

2 Mark(s)

MemoryError
OutOfMemoryError
MemoryOutOfBoundsException
MemoryFullException

What is the extension of compiled java classes?

2 Mark(s)

.java
.js
.class
.txt

What is Truncation in Java?

2 Mark(s)

Floating-point value assigned to a Floating type
Floating-point value assigned to an integer type
Integer value assigned to floating type
Integer value assigned to floating type

Which of the following is a type of polymorphism in Java Programming?

2 Mark(s)

Multiple polymorphism
Compile time polymorphism
Multilevel polymorphism
Execution time polymorphism

Ingres is a ……………………

2 Mark(s)

Socket
Compiler
Database
Web server

Prepared Statement object in JDBC used to execute……….. queries.

2 Mark(s)

Executable
Simple
High level
Parameterized

When a program class implements an interface, it must provide behavior for

2 Mark(s)

two methods defined in that interface
any methods in a class
only certain methods in that interface
all methods defined in that interface

In java

, …………. can only test

for equal

ity, whereas ………… can evaluate any type of

the Boolean expression.

In java

, …………. can only test

for equal

ity, whereas ………… can evaluate any type of

the Boolean expression.

2 Mark(s)

switch, if
if, switch
if, break
continue, if

Which of the below is not a Java Profiler?

2 Mark(s)

JProfiler
Eclipse Profiler
JVM
JConsole

Which of the following is not an OOPS concept in Java?

2 Mark(s)

Polymorphism
Inheritance
Compilation
Encapsulation

What is not the use of “this” keyword in Java?

2 Mark(s)

Referring to the instance variable when a local variable has the same name
Passing itself to the method of the same class
Passing itself to the method of the same class
Calling another constructor in constructor chaining

What is the purpose of the PATH environment variable in Java?

2 Mark(s)

To locate Java libraries
To store Java bytecode
To locate the Java compiler
To optimize Java code

Which component of Java is responsible for running the compiled Java bytecode?

2 Mark(s)

Which of these is not a feature of Java?

2 Mark(s)

Object-oriented
Platform-independent
Compiled
Interpreted language

Which of the following is true about servlets?

2 Mark(s)

Servlets can use the full functionality of the Java class libraries
Servlets execute within the address space of web server, platform independent and uses the functionality of java class libraries
Servlets execute within the address space of web server
Servlets are platform-independent because they are written in java

Which class provides system independent server side implementation?

2 Mark(s)

Server
ServerReader
Socket
ServerSocket

What is the numerical range of a char data type in Java?

2 Mark(s)

0 to 256
-128 to 127
0 to 65535
0 to 32767

Which one of the following is not an access modifier?

2 Mark(s)

Protected
void
private
public

Which of these keywords are used for the block to be examined for exceptions?

2 Mark(s)

check
throw
catch
try

Which of these statements is incorrect about Thread?

2 Mark(s)

start() method is used to begin execution of the thread
run() method is used to begin execution of a thread before start() method in special cases
A thread can be formed by implementing Runnable interface only
A thread can be formed by a class that extends Thread class

What will be the error in the following Java code?

    byte b = 50;
    b = b * 50;

What will be the error in the following Java code?

    byte b = 50;
    b = b * 50;

2 Mark(s)

b cannot contain value 50
b cannot contain value 100, limited by its range
No error in this code
* operator has converted b * 50 into int, which can not be converted to byte without casting

System.in.read() is being used, the program must specify the ……………… clause.

2 Mark(s)

throws.java.out.IOException
throws.java.in.IOException
throws.java.io.IOException
throws.java.io.InException

The third type of comment is used by a t

ool called ……………… for automaticgeneration of documentation.

The third type of comment is used by a t

ool called ……………… for automaticgeneration of documentation.

2 Mark(s)

Java commenting
Java generator
Java doc
Java loc

Which of these cannot be used for a variable name in Java?

2 Mark(s)

identifier & keyword
identifier
keyword
none of the mentioned

What is the extension of java code files?

2 Mark(s)

.js
.txt
.class
.java

What will be the output of the following Java code?

2 Mark(s)

Which environment variable is used to set the java path?

2 Mark(s)

MAVEN_Path
JavaPATH
JAVA
JAVA_HOME

What will be the output of the following Java program?

2 Mark(s)

NaN
Infinity
0.0
all of the mentioned

Which of the following option leads to the portability and security of Java?

2 Mark(s)

Bytecode is executed by JVMBytecode is executed by JVM
The applet makes the Java code secure and portable
Use of exception handling
Dynamic binding between objects

Which of the following is not a Java features?

2 Mark(s)

Dynamic
Architecture Neutral
Use of pointers
Object-oriented

What should be the execution order, if a class has a method, static block, instance block, and constructor, as shown below?

2 Mark(s)

Instance block, method, static block, and constructorInstance block, method, static block, and constructor
Method, constructor, instance block, and static block
Static block, method, instance block, and constructor
Static block, instance block, constructor, and method

The \u0021 article referred to as a

2 Mark(s)

Unicode escape sequence
Octal escape
Hexadecimal
Line feed

_____ is used to find and fix bugs in the Java programs.

2 Mark(s)

Which one of the following is not a Java feature?

2 Mark(s)

Object-oriented
Use of pointers
Portable
Dynamic and Extensible

Which component is used to compile, debug and execute the java programs?

2 Mark(s)

Which statement is true about Java?

2 Mark(s)

Java is a sequence-dependent programming language
Java is a code dependent programming language
Java is a platform-dependent programming language
Java is a platform-independent programming language

The compiled java program can run on an

y ………………… plateform having JavaVirtual Machine (JVM) installed on it.

The compiled java program can run on an

y ………………… plateform having JavaVirtual Machine (JVM) installed on it.

2 Mark(s)

program
java
hardware
non java

…………………… of

a remotely accessible object must implement …………….

…………………… of

a remotely accessible object must implement …………….

2 Mark(s)

all methods, RemoteException
class, RemoteException
class, RemoteInterface
all methods, RemoteInterface

The class at the top of exception class hierarchy is ……………………..

2 Mark(s)

ArithmeticException
Throwable
Class
Exception

The ……………… and ……………….. classes are abstract classes that support reading

and writing of byte streams.

The ……………… and ……………….. classes are abstract classes that support reading

and writing of byte streams.

2 Mark(s)

reader, writer
inputstream, outputstream
objectinputstream, objectoutputstream
none

A package is a collection of

2 Mark(s)

classes
interfaces
editing tools
classes and interfaces

Which of the following control expressions are valid for an if statement?

2 Mark(s)

An integer expression
A Boolean expression
Either A or B
Neither A nor B

The concept of multiple inheritance is implemented in Java by

2 Mark(s)

extending two or more classes
extending one class and implementing one or more interfaces
implementing two or more interfaces
both B and C

Which of the following do not represent legal flow control statements?

2 Mark(s)

break
return
exit ()
continue outer;

Data input is

2 Mark(s)

an abstract class defined in java.io
a class we can use to read primitive data types
an interface that defines methods to open files.
an interface that defines methods to read primitive data type

Who invented Java Programming?

2 Mark(s)

Guido van Rossum
James Gosling
Dennis Ritchie
Bjarne Stroustrup

Which of the following is a valid declaration of a char?

2 Mark(s)

char ch = utea;
char ca = tea;
char cr = u0223;
char cc = itea;

JAVA : Question 1 of 50