Java - Online Test - - javasearch.buggybread.com

Java - Test Questions on '' - 223 questions found

Which of the following statement is not true ?

Reference

Core Java

x==y means they are pointing to the same object

x==y means that they hold same information

x.equals(y) means they are pointing to the same object

x.equals(y) means that they hold same information

Which access specifiers can be used with top level class ?

Core Java

public or default

public or private

public or protected

protected or default

_{access specifier oops java class}

Action Class is singleton and hence not thread safe in ..

Reference

Struts

All versions of Struts

Struts 1

Struts 2

None of Struts versions

_{struts j2ee mvc frameworks struts1 struts2}

Which of the following can be marked static ?

Core Java

Methods , Variables and Initialization Blocks.

Methods , Variables , Initialization Blocks and Outer Classes and nested Classes.

Methods , Variables , Initialization Blocks and Outer Classes.

Methods , Variables , Initialization Blocks and nested Classes.

_{oops java static nested classes static nested classes}

Which of the following cannot be marked static ?

Core Java

Constructors , Classes ( Outer ) , Classes ( nested ), Interfaces , Local variables , Inner Class methods and instance variables.

Constructors , Classes ( Outer ) , Interfaces , Local variables , Class variables , Class Methods , Inner Class methods and instance variables.

Constructors , Classes ( Outer ) , Interfaces , Local variables , Inner Class methods and instance variables.

Constructors , Classes ( Outer ) , Classes (Nested), Interfaces , Local variables , Inner Class methods and instance variables.

_{oops java static nested classes static nested classes}

Which is of the following is NOT TRUE for JVM ?

Reference

Core Java

JVM reads Byte Code and generates Machine Code.

JVM is a virtual Machine that acts as a intermediary between Java Application and Host Operating System.

JVM reads Source Code and generates Byte Code.

JVM acts as a translator that translates different Machine code ( on the basis of Host Machine ) for a common Byte Code.

_java jvm

Interface can only have ...

Reference

Core Java

Member elements and Methods.

Static Variables and Static Methods.

Static Final Variables and Instance Method Declarations.

Member Elements , Instance Methods, Static variables and Static Methods.

_{java oops interfaces}

Which of the following collection maintain its elements in Natural Sorted order ?

Reference

Core Java

HashMap

TreeMap

LinkedHashMap

LinkedMap

_{treemap collections java sorted collections map}

Which of the following collections stores its elements in insertion Order ?

Core Java

HashMap

TreeMap

LinkedHashMap

LinkedMap

_{linkedhashmap collections java map}

If we add Enum constants to a sorted collection ( Treemap , TreeSet ), What will be the order in which they will be maintained ?

Reference

Core Java

Sorted Collection wont maintain them in any order.

Insertion Order

Order in which constants are declared.

Natural Sorting Order.

_{enum collections sorted collections treemap treeset compareTo comparable java}

If we try to add duplicate key to the HashMap, What will happen ?

Core Java

It will throw an exception.

It won't add the new Element without any exception.

The new element will replace the existing element.

Compiler will identify the problem and will throw an error.

_{hashmap map collections java}

In what order the elements of a HashSet are retrieved ?

Reference

Core Java

Random Order

Insertion Order

Natural Sorting Order

Inverse Natural Sorting Order

_{collections set hashset java}

Which of the following is not type of inner classes ?

Reference

Core Java

Simple Inner Class

Static Nested Inner Class

Method Nested Static Inner Class

Anonymous Inner Class

_{java classes inner classes nested classes}

Which of the following was not introduced with Java 5 ?

Reference

Core Java

Generics

Strings within Switch

Enums

Annotations

_{java java5}

Which interface does java.util.Hashtable implement ?

Reference

Core Java

List

Set

Collection

Map

_{hashtable java collections}

Which of the following is false ?

Reference

Core Java

HashMap came before HashTable.

HashMap allows null values whereas Hashtable doesnÃ¢â‚¬â„¢t allow null values.

HashTable and HashMap allow Key-Value pairs.

Hashtable is synchronized whereas HashMap is not.

_{map hashmap hashtable collection java}

Which of the following is true ?

Reference

Core Java

We can serialize static variables

We can serialize transient variables

We can serialize final variables

We can serialize instance methods

_{serialization java file io}

Which of the following is not the use of this keyword ?

Reference

Core Java

Passing itself to another method

To call the static method

Referring to the instance variable when local variable has the same name

Calling another constructor in constructor chaining

_{this this keyword java}

Which of the collections allows null as the key ?

Core Java

HashTable

HashMap

TreeMap

LinkedHashMap

_{java collections map}

What is the initial state of a thread when it is created and started ?

Reference

Core Java

Wait

Running

Ready

Sleep

_{java threads multithreading thread states}

What state does a thread enter when it terminates its processing?

Reference

Core Java

Wait

Ready

Dead

Running

_{java threads multithreading thread states}

How many bits are used to represent Unicode ?

Core Java

8 bits

16 bits

24 bits

32 bits

_{java character coding character encoding}

Overridden methods must have the same ...

Reference

Core Java

name

name and argument list

name, argument list, and return type

name, argument list, return type and belong to the same class

_{java overriding}

What is Maven's order of inheritance?

Maven

parent pom -> project pom -> settings -> CLI parameters

project pom -> parent pom -> settings -> CLI parameters

settings -> parent pom -> project pom -> CLI parameters

CLI parameters -> settings -> parent pom -> project pom

_maven

How do I determine which POM contains missing transitive dependency?

Maven

mvn -A

mvn -M

mvn -R

mvn -X

_{maven maven transitive dependencies}

What is the sequence in which Maven looks for the resources ?

Maven

Remote-> Maven Central - > Local

Local -> Remote - Maven Central

Remote-> Local -> Maven Central

Maven Central -> Local -> Remote

_maven

Which of the following annotation is used to avoid executing Junits ?

Testing

@explicit

@ignore

@avoid

@NoTest

_{java testing junit unit testing}

Which of the following is not the advantage of Mocking frameworks ?

Mocking

It helps testing the module independently

It helps in faster unit testing

It helps in testing code even when external dependencies like service calls are not working

It helps in doing end to end Integration Testing

_{mocking frameworks mockito unit testing junits}

Which of the following is fastest to locate the DOM element ?

HTML

document.getElementById

document.getElementByName

document.ElementName.SubElementName

They all result in similar performance in retrieving the DOM element.

_{html dom javascript}

Why should we have Javascript method definitions within HTML Head section ?

Javascript

Its safe to have javascript code within head section

Head section gets loaded even if there is any error in loading HTML page

Head section gets executed first and hence assure that js method definition will be loaded before they are called

So that we can have method definition and method call at the same place

_{html head section javascript}

What is used to segregate load between multiple servers ?

Java EE

Load Server

Load Manager

Load Traversal

Load Balancer

_{server server hardware}

Which of the following is usually not part of EAR file ?

Java EE

Server Configuration files

HTML and Media Files

Application Configuration files

Class files

_{ear deployment servers java}

Which of the following file is called deployment descriptor ?

Java EE

application.xml

project.xml

web.xml

build.xml

_{configuration files deployment server java}

How can we execute a Java class independently if it doesn't have a static main method ?

Core Java

By initiating the flow in any of the static method

By initiating the flow in any of static block

By initiating the flow in any other instance method named as main

By initiating the flow in any other instance method named as main and making it final

_{main method java}

Which of the following are usually manual ?

Testing

Unit Test

Integration Test

Load Test

Both a and c

_{testing manual testing automated testing}

Which of the following is not an advantage of Junits ?

Testing

Code Stability

Performance

Maintenability

Both a and c

_{testing junits unit testing}

Which of the following nearly involves same Test execution plan ?

Testing

Unit and Integration tests

Unit and Regression Tests

Integration and Performance Tests

Performance and Load Tests

_testing

What is the size of long data type ?

Core Java

16 bit

32 bit

64 bit

128 bit

_{java data types}

What is the size of double type ?

Core Java

16 bit

32 bit

64 bit

128 bit

_{java data types}

What is the size of short type ?

Core Java

8 bit

16 bit

32 bit

128 bit

_{java data types}

Which keyword is used to provide explicit access of a code block to single thread ?

Reference

Core Java

Transient

Final

Explicit

Synchronized

_{java threads multithreading}

Which of the following exception is thrown when we try to access element which is beyond the size ?

Core Java

NullPointerException

ArrayIndexOutOfBoundException

ArithmeticException

ParseException

_{java exceptions error handling}

Checked exception needs to be ...

Core Java

Caught

Method needs to declare that it throws these exception

Either A or B

Both A and B

_{java exceptions checked exceptions}

Collections.sort can only be performed on ..

Core Java

Set

List

Map

Any Collection implementation

_{collections java sorting}

POM stands for ...

Maven

Project Object Model

Project Oriented Model

Prospective Object Model

Prospective Objective Model

_maven pom

Which of the following is not type of Maven Repository ?

Maven

Local

Remote

Maven Central

Maven Local

_{maven repositories}

What is the default location of local repository ?

Maven

~/.m2/repo

~/m2./home/repository

~/m2./repository

~/m2./home/repo

_{maven repositories local repositories m2}

Which of the following is not type of Maven Plugin ?

Maven

Build

Reporting

Remote

All are valid Maven Plugin types

_{maven maven plugins}

Which of the following is not a dependency scope in Maven ?

Maven

Compile

Test

System

Export

_{maven maven dependencies}

What is a project's fully qualified artifact name?

Maven

_{maven artifact}

Which of the following is dependency exclusion ?

Maven

A doesn't depend on C and then A marks C as excluded.

A Depends on B and B depends on C and then A can mark B as excluded.

A and B depends on C and then they can mark C as excluded.

A depends upon B and B depends upon C then A marks C as excluded.

_{maven dependency exclusion}

Effective Java 6 , TreeMap implements ...

Core Java

Map Interface

SortedMap Interface

NavigableMap Interface

SortedNavigableMap Interface

_{java collections map}

Which of the following is not possible ?

Core Java

try block followed by catch

try block followed by finally

try block followed by catch block and then finally

try block without catch or finally block

_{exceptions java try-catch finally}

Which of the following is not the difference between Singleton and Static class ( Class with static members only ) ?

Core Java

Only one object can be created for Singleton class whereas No objects are created for static class.

Singleton class instance is initiated using new keyword whereas static class instance is created using static method.

Singleton class can be serialized whereas Static class cannot be.

Singleton Class can participate in runtime Polymorphism whereas Static class cannot.

_{java oops singleton design pattern static class}

Which of the following is false about main method ?

Core Java

It should be declared public and static

it should have only 1 argument of type String array

We can override main method

We can overload main method

_{java main method}

Which of the following is false about Constructors ?

Constructor can be overloaded

A no argument constructor is provided by the compiler if we declare only constructors with arguments.

Constructors shouldn't have any return types , not even void.

If super is not explicitly called, still super() is intrinsically added by the compiler.

_{java oops constructor}

Variables of an interface are intrinsically ...

Reference

Core Java

transient

final

public

static

_{java interface interface variables}

Which of the following class creates mutable objects ?

Reference

Core Java

Boolean

File

String

StringBuffer

_{java immutable}

Which of the following is wrong for final instance variables ?

Reference

Core Java

They cannot be changed after initialization

They can be initialized directly within static method

They can be declared and initialized together at the same place

They can be initialized within constructor

_{java final final variable java keywords}

Which of the following is false for final ?

Reference

Core Java

Final methods cannot be overriden

Final methods cannot be overloaded

Final classes cannot be subclassed

Final class cannot be abstract

_{java final java keyword}

Invoking start twice on same thread leads to ..

Core Java

ClassCastException

NullPointerException

InterruptedException

IllegalStateException

_{java exception threads}

Which of the following is false about var args ?

Reference

Core Java

Var Args argument should have data type followed by three dots

Three dots should be consecutive and not separated by even space

We cannot have space before and after the dots

If there is a var args in the method, it should be only one and the last one.

_{java var args}

Which of the following is not valid var args declaration ?

Reference

Core Java

int sum (int... numbers)

int sum (.int .. numbers)

int sum (int ... numbers)

int sum (int x, int ... numbers)

_{java var args}

Strings in switch were introduced in Which Java version ?

Core Java

Java 5

Java 6

Java 7

Java 8

_{java switch string in switch}

Which of the following doesn't extend Collection interface ?

Core Java

Set

List

Map

Queue

_{java collections collection interface}

Which is the default Input Formats defined in Hadoop ?

Core Java

SequenceFileInputFormat

ByteInputFormat

KeyValueInputFormat

TextInputFormat

_{hadoop hadoop input format}

Which of the following is not an input format in Hadoop ?

Core Java

TextInputFormat

ByteInputFormat

SequenceFileInputFormat

KeyValueInputFormat

_{hadoop hadoop input format}

Which of the following is a valid flow in Hadoop ?

Bigdata

Input -> Reducer -> Mapper -> Combiner -> -> Output

Input -> Mapper -> Reducer -> Combiner -> Output

Input -> Mapper -> Combiner -> Reducer -> Output

Input -> Reducer -> Combiner -> Mapper -> Output

_{hadoop map reduce}

MapReduce was devised by ...

Bigdata

Apple

Google

Microsoft

Samsung

_{hadoop map reduce}

Which of the following is not a phase of Reducer ?

Bigdata

Map

Reduce

Shuffle

Sort

_{hadoop map reduce}

How many instances of Job tracker can run on Hadoop cluster ?

Bigdata

_{hadoop hadoop cluster}

Which of the following is not the Dameon process that runs on a hadoop cluster ?

Bigdata

JobTracker

DataNode

TaskTracker

TaskNode

_{hadoop hadoop cluster}

What is an instance variable?

Core Java

An instance or object of an class

The field of an object

Any variable of a class

None of the above

_{java oops oop instance variable variables}

Which of the following do you think is the primary reason you would never use a static class even the application doesn't need multiple requests or threads ?

Core Java

Serialization

Runtime Polymorphism

Lazy Loading

Memory

_{static class static vs singleton java oops objects}

Which of the following combination of keywords is illegal in Java ?

Core Java

static and transient

transient and final

static and synchronized

abstract and final

_{java java keywords}

Which of the following keyword is not permitted for outer class ?

public

abstract

final

protected

_{java java keywords}

Which of the following Java feature promotes Code Re usability ?

Core Java

Abstraction

Encapsulation

Inheritance

Polymorphism

_{java java concepts java features code reusability}

Which of the following Java feature promotes access protection or Hiding ?

Reference

Core Java

Inheritance

Encapsulation

Abstraction

Composition

_{java java concepts java features oops concepts oops features access protection information hiding}

Which of the following is not a build tool ?

Maven

Ant

Gradle

svn

_{java build tools}

Which keyword specify that a variable is effectively final ?

Core Java

final

No Keyword

Both of the above

None of the above

_{java java 8 java8 final effectively final}

What is a Sequence File?

Bigdata

A Sequence File contains a binary encoding of an arbitrary number of homogeneous writable objects.

A Sequence File contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be of same type.

A Sequence File contains a binary encoding of an arbitrary number of heterogeneous writeable objects.

A Sequence File contains a binary encoding of an arbitrary number of Writable Comparable objects, in sorted order.

_{hadoop bigdata big data}

What is the input to the Reduce function ?

Bigdata

One Key and One Value

Multiple Keys and Multiple associated Values

Multiple Keys and One associated values with each

One key and associated values.

_{hadoop bigdata big data map-reduce map reduce reduce function}

Which of the following is the implementation language for Map Reduce Framework ?

Big Data

Hadoop

Java

C++

_{hadoop bigdata big data map-reduce map reduce framework}

Which of the following has been introduced with Java 8 ?

Core Java

StringBuffer

StringBuilder

StringFilter

StringJoiner

_{java java8 java 8 String StringJoiner}

enums are intrinsically ..

Core Java

private

public

static

final

_java enum

Enums cannot be declared ..

Core Java

private

public

static

final

_java enum

Which class provides the enumerated value for Bean Scope ?

Spring

BeanDefinition

ConfigurableBeanFactory

WebApplicationContext

All of the Above

_{spring spring beans spring bean scope}

Which of the following Interface needs to be implemented by any object that wishes to be notified of the ApplicationContext that it runs in ?

Spring

ApplicationContextAware

ApplicationContextUtils

ApplicationContext

Aware

_{spring applicationcontext application context ApplicationContextAware}

In Spring , Which class handles the Http requests for RESTful web services ?

Spring

Service

Model

Controller

Util

_{spring frmaework spring mvc rest webservices}

When String literals are compared using ==, they always returns true if the string values are same because ..

Reference

Core Java

of overridden compareTo method

of overridden compare method

of String Pool

== means that the object contents are equal

Which of the following is true ?

Core Java

Composition is Tightly Bound

Inheritance is Tightly Bound

Object can only hold reference of only one other object

A Class cannot be extended by multiple classes

In case of String Literals ..

Reference

Core Java

x==y on all literals always returns false

x.equals(y) on all literals always returns false

if x.equals(y) returns true, x==y returns true too

if x.equals(y) returns false, x==y returns true

What is a default constructor ?

Reference

Core Java

Constructor without parameters declared by user

Constructor provided by Java if no constructor is declared

Constructor with empty body

All of the above

_Constructor

How can we create objects if we make the constructor private ?

Core Java

We can't create objects if constructor is private

We can only create objects if we follow singleton pattern

We can only create one object

We can create new object through static method or static block

_{constructor private constructor}

What will be the output of following ?

String str1 = new String("String1");
String str2 = new String("String1");
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

Core Java

falsetruetrue

truetruetrue

truetruefalse

falsetruefalse

_{equals object equality}

What will be the output of following code ?

String str1 = "String1";
String str2 = "String1";
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

Core Java

falsetruetrue

falsefalsetrue

truetruetrue

falsefalsefalse

_{equals object equality string pool}

What will be the output of following code ?

String str1 = "String1";
String str2 = "String2";
str1.concat("String3");
System.out.print(str1);
System.out.print(str2);

Core Java

String1String2

String1String3String3

String1String3String1String3

String1String1

What will be the output of following code ?

String str1 = "String1";
String str2 = "String2";
str1=str1.concat("String3");
System.out.print(str1);
System.out.print(str2);

Core Java

String1String2

String1String3String2

String1String2String3

String1Stringg3String1

Which method needs to be implemented if a class is implementing comparable interface ?

Core Java

comp

compare

compareTo

compareEquals

_{comparable interfaces compare compareTo}

Which of the following is false ?

Core Java

A Class cannot override both hashcode and equals method.

A class can override both hashcode and equals method.

A Class must override hashCode method if its overridding equal method.

A Class can override hashCode even if its not overridding equals method.

_{hascode equals method overridding hashcode and equals method}

Collections is a / an ..

Core Java

interface

abstract class

final class

util class

_collections

Which of the following can throw ClassCastException ?

Core Java

UpCasting

DownCasting

Casting to incompatible data type

Casting to Strings

_casting

Which of the following can be overridden ?

Reference

Core Java

final instance methods

final static methods

non final instance methods

non final static methods

_overriding

x instanceOf y returns false ..

Core Java

if x is an instance of y class

if x is an instance of class implementing y interface

if x is an instance of class extending y class

if x is an instance of Class which is a parent of Y class

_instaceOf

notify(), notifyAll(), wait() are found in which class

Reference

Core Java

java.lang.Object

java.lang.Thread

java.lang.Runnable

java.lang.Implement

if classes B and C extends Class A, Which of the following initialization is correct ?

Core Java

B b = new C();

C c = new B();

B b = new A();

A a = new B();

_inheritance

If X implements Y and Y extends Z, Which of the following initialization is correct ?

Core Java

X x = new Y();

X x = new Z();

Z z = new Y();

Z z = new X();

_interfaces

If class A implements X interface, and Class B implements Y interface, and X is the parent of Y, Which of the following initialization is correct ?

Core Java

A a = new B();

Y y = new A();

X x = new B();

Y y = new A();

_{interfaces inheritance}

What will be the output of executing following class ?

public class BuggyBread {

static {
System.out.println("Static Block");
}

{
System.out.println("Initialization Block");
}

BuggyBread(){
System.out.println("Constructor");
}

public static void main(String[] args){
System.out.println("Main Method");
}
}

Core Java

Static Block
Main Method

Static Block
Instance Initialization Block
Main Method

Static Block
Constructor
Main Method

Static Block
Instance Initialization Block
Constructor
Main Method

_{static block Instance Initialization Block}

What will be the output upon executing following class ?

public class BuggyBread {

static {
System.out.println("Static Block");
}

{
System.out.println("Instance Initialization Block");
}

BuggyBread(){
System.out.println("Constructor");
}

public static void main(String[] args){
System.out.println("Main Method");
new BuggyBread();
}
}

Core Java

Instance Initialization Block
Constructor
Static Block
Main Method

Static Block
Instance Initialization Block
Constructor
Main Method

Main Method
Static Block
Instance Initialization Block
Constructor

Static Block
Main Method
Instance Initialization Block
Constructor

_{static block Instance Initialization Block}

With the following code, Which is a valid way to initialize ?
public class BuggyBread {

   private String element1;

   private String element2;

   private BuggyBread(String element1, String element2){
      this.element1 = element1;
      this.element2 = element2;
   }

   public static class Builder {

      private String element1;

      private String element2;

      Builder(BuggyBread buggybread){
         element1 = buggybread.element1;
         element2 = buggybread.element2;
      }

      Builder withElement1(String element1){
         this.element1 = element1;
         return this;
      }

      Builder withElement2(String element2){
         this.element2 = element2;
         return this;
      }

      BuggyBread build(){
         BuggyBread buggybread = new BuggyBread(element1,element2);
         return buggybread;
      }
   }
}

Core Java

BuggyBread buggybread = new BuggyBread();

BuggyBread buggybread = new BuggyBread("element1","element2");

BuggyBread.Builder builder = new BuggyBread.Builder();

BuggyBread.Builder builder = new BuggyBread.Builder("element1","element2");

_{builder pattern}

What will be the output of following code ?

public class BuggyBread {

   private int x;
   private int y;

   BuggyBread(int x,int y){};

   public static void main(String[] args){
      BuggyBread buggybread = new BuggyBread();
      System.out.println(buggybread.x);
   }
}

Reference

Core Java

null

compilation error due to uninitialized element

compilation error due to constructor

_{default constructor}

What will be the output of following ?

public class BuggyBread {

   private int x;
   private Integer y;

   BuggyBread(int x,int y){};

   public static void main(String[] args){
      BuggyBread buggybread = new BuggyBread(1,2);
      System.out.println(buggybread.x);
      System.out.println(buggybread.y);
   }
}

Reference

Core Java

0 0

0 null

null 0

null null

_{default values}

What will be the output of following code ?

public class BuggyBread {

   private int x;
   private Integer y;

   private BuggyBread(int x,int y){};

   public static void main(String[] args){
      BuggyBread buggybread = new BuggyBread(1,2);
      System.out.println(buggybread.x);
   }
}

Core Java

compilation error due to private constructor

compilation error due to uninitialized elements

0 null

0 0

_constructor

What will be the output of following code ?

public class BuggyBread {

   private int x;

   private BuggyBread(int x){
      x = x;
   };

   public static void main(String[] args){
      BuggyBread buggybread = new BuggyBread(5);
      System.out.println(buggybread.x);
   }
}

Core Java

compilation error

undefined

_{this keyword coding code}

What will be the output of exceuting main method ?

public static void main(String[] args){
      List list = new ArrayList();
      list.add(1);
      list.add(2);
      list.add(3);
      System.out.println(list);
   }

Core Java

1,2,3

Order cannot be determined

compilation error

3,2,1

_{collections list arraylist}

What will be the output upon executing main method ?

public static void main(String[] args){
      Set set = new HashSet();
      set.add(1);
      set.add(2);
      set.add(3);
      System.out.println(set);
   }

Core Java

1,2,3

Order cannot be determined

Compilation error

3,2,1

_{set hashset collections}

What will be the ouput upon executing main method ?

public class Vehicle {
   public void move(){
      System.out.println("Vehicle is moving");
   }
}

public class Car {
   public void move(){
      super().move();
      System.out.println("Car is moving");
   }

   public static void main(String[] args){
      new Car().move();
   }
}

Core Java

Vehicle is moving

Car is moving

Vehicle is moving Car is moving

Compilation Error

_overriding

What will be the output upon exceuting main method ?

public class Vehicle {
   private void move(){
      System.out.println("Vehicle is moving");
   }
}

public class Car extends Vehicle{
   public void move(){
      System.out.println("Car is moving");
   }

   public static void main(String[] args){
      Vehicle vehicle = new Car();
      vehicle.move();
   }
}

Core Java

Vehicle is moving

Car is moving

Vehicle is moving Car is moving

Compilation error

_overriding

What will be the output upon executing the main method ?

public class Vehicle {
   public void move(){
      System.out.println("Vehicle is moving");
   }
}

public class Car extends Vehicle{
   public void move(){
      System.out.println("Car is moving");
   }

   public static void main(String[] args){
      Vehicle vehicle = new Vehicle();
      ((Car)vehicle).move();
   }
}

Core Java

Vehicle is moving

Car is moving

Cimpilation Error

Runtime Exception

_overriding

Which of the following is not the dependency scope in Maven ?

Reference

Maven

Compile

Runtime

Debug

Test

_{maven maven dependencies scope}

Which of the following is true for == operator ?

Core Java

For primitives, == checks if the variables on left and right have same data type

For primitives, == checks if the variables on left and right have same value

For Objects, == checks if the references on left and right have same data type

For Objects, == checks if the references on left and right have same value

_{== operator equality}

Which of following uniquely identify the artifact or dependency in Maven ?

Maven

Artifact Id

Group Id

Version

All of the above

_maven

Which of following is not type of Maven Repository ?

Maven

Local

Remote

Central

State

_{maven maven repository}

Which of the following is equivalent to following logic ?

Not X && Not Y

Core Java

x || Y

Not(X || Y)

Not(X && Y)

Not X && Y

_{logical operator}

Which of the following http response means the resource is not found ?

Java EE

500

200

404

400

_{http status code http web}

What is Dirty Read in Database Transactions ?

Database

Data Read by Transaction 2 which hasn't yet updated by Transaction 1

Data Read by Transaction 2 which has been updated and commited by Transaction 1

Data Read by Transaction 2 which has been updated but not commited by Transaction 1

Inability of Transaction 2 to read Data when Transaction 1 is updating.

_{database transaction}

Which of following annotation is used to initialize objects before executing set of tests ?

Reference

Junit

@Test

@Ignore

@After

@Before

_{junit junit annotations testing}

Optional has been introduced in Java 8 to get away with which of following exception ?

Reference

Core Java

ArithmeticException

ParseException

NullPointerException

FileNotFoundException

_optional

Which of the following is not true for abstract classes ?

Reference

Core Java

Abstract Class is only meant to be sub classed and not supposed to be instantiated.

Abstract class handlers can be used to handle derived class objects.

We can't have an abstract class without abstract methods.

Abstract class has member elements.

_{abstract class abstract methods}

Which of the following is not true for static keyword ?

Reference

Core Java

Static members are shared by all objects of the class.

We can override static methods.

Static methods operate on static variables only.

Static Elements are accessed using class name.

_static

Which of the following class creates immutable objects ?

Reference

Core Java

String

StringBuffer

StringBuilder

None of these create immutable objects.

_{String StringBuffer StringBuilder Immutable}

Which of the following class is synchronized ?

Reference

Core Java

String

StringBuffer

StringBuilder

None of these

_{String StringBuffer StringBuilder Synchronized}

Which of the following methods are used by Java Garbage Collection Mechanism ?

Core Java

final

finally

finalize

All of the above

_{garbage collection finalize}

Which of the following about Garbage collection is false ?

Core Java

We can call Garbage collection explicitly

Garbage Collection guarantees that the application will not run out of memory

finalize method is used by Java for Garbage Collection

Garbage Collection Mechanism delete unclaimed objects that are no longer required

_{garbage collection}

What is Lazy Initialization in Hibernate ?

Reference

Hibernate

Feature to load the dependencies from Cache

Feature to load all objects and relationships in advance before they can be used

Feature to not load dependencies and relationship in advance and load when required

Feature to not load the dependencies and relationships at all

_{Lazy Initialization}

Which of the following is not the benefit of Lazy Initialization in Hibernate ?

Hibernate

Laod When required provides better performance

Object stays lighter

Less number of Database calls

Less load on Database

_{Lazy Initialization Lazy Fetching}

Which of the following is not an advantage of JSON over XML ?

Reference

JSON

Lighter and Faster

Object Representation

Supports multiple data types

Backward compatible with all XML applications

_JSON XML

JSON is a ..

JSON

Programming Language

Markup Language

Scripting Language

Database Language

Binary Search requires that the collection should be

Reference

Algorithm

Sorted in Ascending Order

Sorted in Descending Order

Sorted in any Order

Unsorted

_{Binary Search Search Algorithm}

Which of the following can be declared abstract ?

Core Java

static methods

instance methods

static variable

instance variables

_abstract

Which of the following class types in MVC should have Business Logic ?

Design

Model

View

Controller

JSP

_mvc

Which of the following web status code means "Resource not found" ?

Reference

Java EE

500

200

401

404

What is the relationship between Vehicle and Engine in this example ?

public class Vehicle {
   Enginer engine;
   public void move(){
      engine = new Engine();
      engine.start();
   }
}

Core Java

Composition ( Vehicle has a Engine )

Composition ( Engine has a Vehicle )

Inheritance ( Vehicle is a Engine )

Inheritance ( Engine is a Vehicle )

_{composition inheritance oops concepts}

What is the relationship between Car and Vehicle in the following code ?

public class Car extends Vehicle{
   Engine engine;

   public static void main(String[] args){
      Vehicle vehicle = new Car();
      car.move();
   }

   public void move(){
      engine = new Engine();
      engine.start();
   }
}

Core Java

Composition ( Vehicle has a Car )

Composition ( Car has a Vehicle )

Inheritance ( Vehicle is a Car )

Inheritance ( Car is a Vehicle )

_{Inheritance Composition Oops concepts}

What is the problem with the following code ?

public class Car extends Vehicle{
   Vehicle vehicle;

   Car(){
      super();
      this.vehicle = new Vehicle();
   }
}

Core Java

There is an Inheritance as well as Composition relationship between Vehicle and Car which is not permitted

We cannot initialize the parent class instance within the constructor

Call to super is illegal

There is no problem

_{Composition Inheritance OOPS concepts}

What is the problem with this code ?

public class Car extends Vehicle{
   int x;

   Car(int y){
      x = 5;
   }

   Car(){
      this(5);
      super();
   }
}

Reference

Core Java

We cannot overload constructors

Constructors should have type

we should have called super() before this(5)

We cannot have both super() and this() in a constructor

_{Constructor this super}

What is the problem with this code ?

public class Car extends Vehicle{
   int x;

   Car(int y){
      x = 5;
   }

   Car(){
      super();
      this.x = 5;
   }
}

Core Java

We cannot overload constructors

We cannot call super in overloaded constructor

we cannot have this and super in constructor

There is no problem

_{constructor this super}

The following code is an example of

public class Car extends Vehicle{
   int x;

   Car(int y){
      x = 5;
   }

   Car(){
      this(5);
   }
}

Core Java

Constructor Overloading

Constructor Chaining

Both Constructor Overloading and Chaining

None of above

_{constructor constructor overloading constructor chaining}

What is the problem with following code ?

public class Car extends Vehicle{
   int x;

   void Car(int y){
      x = 5;
   }

   void Car(){
      this(5);
   }
}

Core Java

We cannot use this() within normal method

We cannot chain methods

We cannot overload constructors

We cannot use return type void with overloaded methods

_constructor

How to append the output of a command to file

Unix

command < file

command > file

command <> file

command >> file

_{Unix Commands}

Which command helps you know in which folder you currently are ?

Unix

cat

pwd

who am i

_{Unix Commands}

What is the command to move to your home directory ?

Unix

cd..

cd home

cd .

Which Database feature assist in ACID capabilities ?

Core Java

Indexes

Stored Procedures

Locking

Cursors

_acid

The use of volatile keyword facilitates ..

Core Java

Making Use of Cache for better Performance

Avoiding use of Cache

Making use of Backward as well as Forward Cache

Keeping only one copy of variable in Cache

_{volatile java keywords}

Function variables are kept in ..

Core Java

Stack

Heap

Both Stack and Heap

None of them

_{memory management stack heap}

Which of the following is a Marker Interface ?

Core Java

Runnable

Serializable

Cloneable

Both Serializable and Cloneable

_{marker interface interfaces}

Static Polymorphic in Java is achieved through ..

Core Java

Method Overloading

Method Overriding

Variable Overloading

Variable Overriding

_{polymorphism static polymorphism}

Runtime Polymorphism in Java is achieved through ..

Core Java

Method Overloading

Method Overriding

Variable Overloading

Variable Overriding

_{runtime polymorphism polymorphism}

Which of the following collections stores its elements in natural sorting order ?

Core Java

HashMap

LinkedHashMap

TreeMap

EnumMap

_{map collections}

Which of following stores its elements in natural Sorting Order ?

Core Java

AbstractSet

HashSet

LinkedHashSet

TreeSet

_{set collections}

Thread thats executed before the JVM exits is called ..

Core Java

final thread

finally thread

daemon thread

shutdown hook

What kind of thread is Garbage collection thread ?

Core Java

Daemon Thread

User Thread

System Thread

Active Thread

_{garbage collection thread type}

Which of following is Daemon Thread ?

Core Java

Thread Scheduler

Daemon Thread

Both of above

None of above

_{daemon thread threads}

Which of following can be nested into another ?

Core Java

class within another class

class within interface

interface within class

All of above

_{nested classes nested interface inner classes}

Which of following are serialized ?

Core Java

static variables

transient variables

instance variables

method local variables

_{serialization}

In which case finally won't get executed ?

Core Java

in case of exception

in case of normal execution

in case of return statement before end of try block

in case of force program termination

_finally

Which Java version introduced Lambda expressions ?

Reference

Core Java

Java 5

Java 7

Java 8

Java 9

Which of following is not the method of object class ?

Core Java

run

notify

wait

clone

_{object class}

Which of following is not true ?

XML

Dom Parser loads the whole doument at once in memory

A DOM Parser is much more memory efficient

Dom Parser doesn't load the whole doument at once in memory

A SAX Parser is much more memory efficient

_{xml xml parsers}

Which of the following file is called deployment descriptor ?

Java EE

application.xml

web.xml

config.xml

web-application.xml

_{deployment descriptor}

Which of the following is not true ?

Core Java

A Java class can extend multiple classes

A Java class can implement multiple interfaces

A Java interface can extend multiple interfaces

All of above are true

_{inheritance multiple inheritance}

Which of following class types in MVC holds Business logic ?

Java EE

Model

View

Controller

Accessor

_mvc

Which memory segment holds String Pool ?

Core Java

Stack

Heap

Code Segment

Class Segment

_{memory management string pool}

In this code

public class BuggyBread1{
   private static String staticVariable = "static Variable";

   private String instanceVariable = "instance Variable";

   public static void main (String args[]) {
String localVariable = "local Variable";
}
}

Where will the value 'static Variable' be stored ?

Core Java

Stack Memory Segment

Heap Memory Segment

Runtime Constant Pool within Heap Segment

Code Segment

_{memory manegement}

Core Java

Stack Memory Segment

Heap Memory Segment

Runtime Constant Pool within Heap Segment

Code Segment

_{memory management}

In this code

public class BuggyBread1{
   private static String staticVariable = "static Variable";

   private String instanceVariable = "instance Variable";

   public static void main (String args[]) {
String localVariable = new String("local Variable");
}
}

Where will the value 'local Variable' be stored ?

Core Java

Stack Memory Segment

Heap Memory Segment

Runtime Constant Pool within Heap Segment

Code Segment

_{memory management}

In this code

public class BuggyBread1{
   private static String staticVariable = new String("static Variable");

   private String instanceVariable = "instance Variable";

   public static void main (String args[]) {
String localVariable = "local Variable";
}
}

Where will the value 'static Variable' be stored ?

Core Java

Stack Memory Segment

Heap Memory Segment

Runtime Constant Pool within Heap Segment

Code Segment

_{memory management}

What will be the output of this code

ArrayList list = new LinkedList();
list.add(3);
list.add(2);
list.add(1);
System.out.println(list);

Core Java

1,2,3

3,2,1

Order cannot be determined

Compilation Error

_{list collections}

Which of following keyword is not allowed for Outer Class ?

Core Java

public

private

abstract

final

_{java keywords}

Which of following memory segment is cleaned by Garbage Collection Mechanism ?

Core Java

Stack

Heap

Code

Cache

_{memory management garbage collection}

Default Constructor is provided by Java , if ..

Core Java

No constructor is provided by coder

No argument constructor is not provided by Coder

No Constructor is provided by coder initializing fields to null and primitive default values

No argument constructor is provided by coder

_Constructor

Default Constructor is provided by Java ...

Core Java

To Reserve Memory

To provide at least one instance method

To Make it look good

To initialize the object state

_Constructor

Which of following is an application server ?

Server

Tomcat

MySql

Oracle

All of above

_servers

Which of the following wildcard is used to import multiple packages at once ?

Core Java

_{import packages import}

In Case a method is declared to throw an exception , We can only use a call to that method if ...

Core Java

We use the call within try block and catch the exception

We declare that the method is expected to throw the exception using throws

Both 1 and 2

Either 1 or 2

_{exception handling throws}

Which of the following Java feature specify hash-a relationship between objects ?

Core Java

Inheritance

Composition

Polyorphism

Encapsulation

_oops

Which of the following keyword restrict the class from being extended ?

Core Java

Private

Abstract

Final

Static

_{java keywords}

Which of the following keyword restrict the class from being instantiated ?

Core Java

Private

Abstract

Final

Static

_{java keywords}

Which of the following is not true for Hibernate Cache ?

Hibernate

First level cache is enabled by default

First level Cache is Session specific

First level cache is considered global

First level Cache came with Hibernate 1.0

_{hibernate cache}

Which of the following is not an Hibernate Annotation

Hibernate

@Id

@JoinTable

@ManyToMany

@Autowired

_{hibernate annotations}

Which of following is not Spring MVC annotation ?

Spring

@Autowired

@Controller

@JoinColumn

@Transactional

_{spring annotations}

We cannot override compareTo method for ...

Core Java

Abstract Class

Final Class

Enum

Interfaces

_compareTo

Which of the following keyword is expected with main method declaration ?

Core Java

Final

Static

Volatile

Transient

_{main method}

Which of the following is true ?

Core Java

http and https are secured protocols

http is a secured protocol whereas https is not a secured protocol

https is an unsecured protocol whereas https is a secured protocol

https and https are unsecured protocols

_{http https}

Overriding is not possible without ..

Core Java

Inheritance

Composition

Inner Classes

Abstract Classes

_overriding

Which of the following is true ?

Core Java

throw and throws are used to throw an exception

throw is used to throw an exception whereas throws is a declaration that the method can throw the exception

throws is used to throw an exception whereas throw is a declaration that the method can throw the exception

throw and throws are used to declare that an exception can be thrown by the method

_{throw throws exception handling}

throws is a declaration that the ..... is expected to throw an exception ?

Core Java

Variable

Method

Class

Interface

_{throws exception handling}

What is out in System.out.println ?

Core Java

out is static inner class

out is the reference for static inner class object

out is the static reference to OutputStream object

out is the static reference to PrintStream object

_{System.out.println}

With the declaration like following ,

Object obj = new String();

which of the following code will give compilation error

Reference

Core Java

obj.clone()

obj.toString()

obj.equals()

obj.append()

In majority of the cases, the following join will give maximum number of results ?

Reference

Database

Inner Join

Outer Join

Left Join

Right Join

_{sql sql joins}

Which if the following is true for SQL Joins ?

Reference

Database

Left Join and Right Join gives equal number of Results

Outer Join and Inner Join gives equal number of Results

Inner Join gives maximum number of results records

Inner Join gives minimum number of result records

_{sql sql joins}

Which of following about main method is not true ?

Core Java

We can have multiple methods named main in a class

We can have var args with the main method

We can overload main method

We can override main method

_{main method}

Which of the following collection classes store their elements as Key Value pairs ?

Core Java

Set

List

Map

Queue

_collections

Listeners are example of ..

Design

Factory design Pattern

Abstract Factory Design Pattern

Singleton Design Pattern

Observer Design Pattern

_{Design Pattern}

Which of following cannot be overloaded ?

Core Java

Constructors

Main Method

Final Methods

All of above can be overloaded

_overloading

Which of following is an IDE ?

Tool

Jira

Maven

Eclipse

Apache

_tools

Which of following is a Build Tool ?

Tool

Maven

Jira

Eclipse

Tomcat

_tool

Which of the following is a configuration management tool ?

Tool

Github

Jira

Tomcat

Eclipse

_{tools configuration management}

Which of following is not a configuration management tool ?

Tool

SVN

Jira

GitHub

Clearcase

_{configuration management source code management scm}

An Ideal Util class doesn't have ...

Core Java

private constructor

static methods

static variables

non static methods

_{Util classes}

Which of the following Design pattern has been used with Hibernate Criteria ?

Hibernate

Filter

Prototype

Builder

Observer

_{Hibernate Design Pattern}

Which of following is not core interface of Hibernate ?

Hibernate

Session

Transaction

SessionFactory

TransactionFactory

_{Hibernate hibernate Core Interface}

Which of the following is not true for Prepared Statements ?

Database

Prepared Statements provides better performance

Prepared Statements prevent SQL Injection attacks

Prepared Statements provide ORM capabilities

Prepared Statement provides DB side caching

_{database Prepared Statements}

Which of the following session method is used to disassociate / disconnect all objects from the session

Reference

Hibernate

Clear

Evict

Merge

Which of the following session method is used to disassociate / disconnect a particular object / entity from the session

Hibernate

Clear

Evict

Merge

_{Hibernate Hibernate Session}

Which of following is not the resolution for preventing LazyInitializationException?

Hibernate

Set fetch=FetchType.EAGER for Dependent entity mapping

Make sure that we are accessing the dependent objects before closing the session

Make sure that we are accessing the dependent objects after closing the session

Wrap the complete access within Transaction

_{Hibernate LazyInitializationException}

Semaphores are used to solve problem of ...

Operating system

Race Condition

Process Synchronization

Mutual Exclusion

All of above

_{Semaphore Operating system}

Which of the following is a valid way to avoid NullPointerException ?

Core Java

Avoid assigning null to the reference

Null Checks before accessing elements of an object

Both of the above

None of the above

_{NullPointerException null}

Which of the following class cannot be extended or inherited ?

StringBuffer , StringBuilder

Core Java

StringBuffer

StringBuilder

Both cannot be extended

Both can be extended

_{final classes StringBuffer StringBuilder}

Spring MVC is a ..

Spring

Model Framework

View Framework

GUI Framework

Web Framework

_{Spring Frameworks}

Other name for setter methods is ..

Core Java

Getter Methods

Redefinition Methods

Final methods

Mutator methods

_methods

Which type of EJB can use bean pooling?

Java EE

Session Beans

Stateless Session Beans

Stateless Sessionless Beans

Any EJB Beans

_EJB Beans

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