Withoutbook LIVE Mock Interviews

Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before Interview

Test your skills through the online practice test: Java 8 Quiz Online Practice Test

Ques 1. What are main advantages of using Java 8?

There are the main advantages of using Java 8:

More compact code
Less boiler plate code
More readable and reusable code
More testable code
Parallel operations

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 2. What is the difference between Predicate and Function?

Both are functional interfaces.

Predicate<T> is single argument function and either it returns true or false. This can be used as the assignment target for a lambda expression or method reference.
Function<T,R> is also single argument function but it returns an Object. Here T denotes type of input to the function and R denotes type of Result. This can also be used as the assignment target for a lambda expression or method reference.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Freshers / Beginner level questions & answers

Ques 3. What are new features which got introduced in Java 8?

There are lots of new features which were added in Java 8. Here is the list of important features:

Lambda Expression
Stream API
Default methods in the interface
Functional Interface
Optional
Method references
Date API
Nashorn, JavaScript Engine

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 4. Can you explain the syntax of Lambda expression?

So we can divide structure of Lambda expression to three parts:

Arguments
Array Token
Statements

1. Argument list or parameters

Lambda expression can have zero or more arguments. First part before '->' is called as argument list or parameters.

()->{System.out.println("Hello")}; //Without argument, will print hello

(int a)->{System.out.println(a)} //; One argument, will print value of a

(int a,int b)-> {a+b};//two argument, will return sum of these two integers

2. Array token (->)

3. Body

Body can have expression or statements.
If there is only one statement in body, curly brace is not needed and return type of the anonymous function is same as of body expression.
If there are more than one statements, then it should be in curly braces and return type of anonymous function is same as value return from code block, void if nothing is returned.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 5. What are functional interfaces?

Functional interfaces are those interfaces which can have only one abstract method. It can have static method, default methods or can override Object’s class methods.
There are many functional interfaces already present in java such as Comparable, Runnable.
As we have only one method in Runnable, hence it is considered as functional interface.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 6. What Is a Default Method and When Do We Use It?

A default method is a method with an implementation – which can be found in an interface.

We can use a default method to add a new functionality to an interface while maintaining backward compatibility with classes that are already implementing the interface:

public interface CarBehaviour {

public void move();

default void peep() {

System.out.println("peep!");

}

Usually, when a new abstract method is added to an interface, all implementing classes will break until they implement the new abstract method. In Java 8, this problem has been solved by the use of default method.

For example, Collection interface does not have forEach method declaration. Thus, adding such method would simply break the whole collections API.

Java 8 introduces default method so that Collection interface can have a default implementation of forEach method without requiring the classes implementing this interface to implement the same.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 7. What is Optional and how can we use it?

Optional is a container object used to contain not-null objects. Optional object is used to represent null with absent value. This class has various utility methods to facilitate code to handle values as ‘available’ or ‘not available’ instead of checking null values.

Following is the declaration for java.util.Optional<T> class:

public final class Optional<T> extends Object

Coding Example:

import java.util.Optional;

public class OptionalTester {

public static void main(String args[]) {

OptionalTester optionalTester = new OptionalTester();

Integer value1 = null;

Integer value2 = new Integer(10);

//Optional.ofNullable - allows passed parameter to be null.

Optional<Integer> a = Optional.ofNullable(value1);

//Optional.of - throws NullPointerException if passed parameter is null

Optional<Integer> b = Optional.of(value2);

System.out.println(optionalTester.sum(a,b));

}

public Integer sum(Optional<Integer> a, Optional<Integer> b) {

//Optional.isPresent - checks the value is present or not

System.out.println("First parameter is present: " + a.isPresent());

System.out.println("Second parameter is present: " + b.isPresent());

//Optional.orElse - returns the value if present otherwise returns

//the default value passed.

Integer value1 = a.orElse(new Integer(0));

//Optional.get - gets the value, value should be present

Integer value2 = b.get();

return value1 + value2;

}

It should produce the following output:

First parameter is present: false

Second parameter is present: true

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 8. Provide some APIs of Java 8 Date and Time.

LocalDate, LocalTime, and LocalDateTime are the Core API classes for Java 8. As the name suggests, these classes are local to context of observer. It denotes current date and time in context of Observer.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 9. How will you get current date and time using Java 8 Date and TIme API?

You can simply use now() method of LocalDate to get today’s date.

LocalDate currentDate = LocalDate.now();

System.out.println(currentDate);

Output:

2017-09-09

You can use now() method of LocalTime to get current time.

LocalTime currentTime = LocalTime.now();

System.out.println(currentTime);

Output:

23:17:51.817

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Intermediate / 1 to 5 years experienced level questions & answers

Ques 10. What is lambda expression?

Lambda expression is anonymous function which have set of parameters and a lambda (->) and a function body. You can call it function without name.

Structure of Lambda Expressions:

(Argument List) ->{expression;} or

(Argument List) ->{statements;}

For instance, the Runnable interface is a functional interface, so instead of:

Thread thread = new Thread(new Runnable() {

public void run() {

System.out.println("Hello World!");

}

});

Using Lambda you can simply do the following:

Thread thread = new Thread(() -> System.out.println("Hello World!"));

Functional interfaces are usually annotated with the @FunctionalInterface annotation - which is informative and does not affect the semantics.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 11. Given a list of employees, sort all the employee on the basis of age by using java 8 APIs only.

You can simply use sort method of list to sort the list of employees.

List<Employee> employeeList = createEmployeeList();

employeeList.sort((e1,e2)->e1.getAge()-e2.getAge());

employeeList.forEach(System.out::println);

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 12. Given the list of employees, find the employee with name 'John' using Java 8 API.

Check the following code:

List<Employee> employeeList = createEmployeeList();

Optional<Employee> e1 = employeeList.stream()

.filter(e->e.getName().equalsIgnoreCase("Mary")).findAny();

if(e1.isPresent())

System.out.println(e1.get());

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 13. Given a list of employee, find maximum age of employee using Java 8 API.

Check the following code:

List<Employee> employeeList = createEmployeeList();

OptionalInt max = employeeList.stream().

mapToInt(Employee::getAge).max();

if(max.isPresent())

System.out.println("Maximum age of Employee: "+max.getAsInt());

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 14. Provide some examples of Intermediate operations.

Example of Intermediate operations are:

filter(Predicate)
map(Function)
flatmap(Function)
sorted(Comparator)
distinct()
limit(long n)
skip(long n)

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 15. Provide some examples of Terminal operations.

Example of Terminal operations are:

forEach
toArray
reduce
collect
min
max
count
anyMatch
allMatch
noneMatch
findFirst
findAny

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Experienced / Expert level questions & answers

Ques 16. How lambda expression and functional interfaces are related?

Lambda expressions can only be applied to abstract method of functional interface.

For example:

Runnable has only one abstract method called run, so it can be used as below:

// Using lambda expression

Thread t1=new Thread(

()->System.out.println("In Run method")

);

Here we are using Thread constructor which takes Runnable as parameter. As you can see we did not specify any function name here, as Runnable has only one abstract method, java will implicitly create anonymous Runnable and execute run method.

It will be as good as below code.

Thread t1=new Thread(new Runnable() {

@Override

public void run() {

System.out.println("In Run method");

}

});

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 17. Can you create your own functional interface?

Yes, you can create your own functional interface. Java can implicitly identify functional interface but you can also annotate it with @FunctionalInterface.

Example:

Create interface named "Readable" as below:

public interface Readable {

void read();

default void readBook()

{

System.out.println("Reading the book.");

}

Create main class named "MyFunctionalInteface":

public class MyFunctionalInteface {

public static void main(String[] args)

{

MyFunctionalInteface myFuncInterface = new MyFunctionalInteface();

myFuncInterface.readMyBook(() -> System.out.println("Reading my book"));

}

public void readMyBook(Readable p)

{

p.read();

}

When you run above program, you will get below output:

Reading my book

As you can see, since Readable has only one abstract method called read(), we were able to call it using lambda expression.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 18. What is method reference in java 8?

Method reference is used refer method of functional interface. It is nothing but compact way of lambda expression.You can simply replace lambda expression with method reference.
Syntax:
class::methodname

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 19. What the issues with Old Date and time API before Java 8? Date and Time API differences between Java 8 and earlier Java version.

Issues with old Date and Time API:

Thread Safety: You might be already aware that java.util.Date is mutable and not thread safe. Even java.text.SimpleDateFormat is also not Thread-Safe. New Java 8 date and time APIs are thread safe.
Performance: Java 8 new APIs are better in performance than old Java APIs.
More Readable: Old APIs such Calendar and Date are poorly designed and hard to understand. Java 8 Date and Time APIs are easy to understand and comply with ISO standards.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 20. Do we have PermGen in Java 8? What is MetaSpace in Java 8?

Until Java 7, JVM used an area called PermGen to store classes. It got removed in Java 8 and replaced by MetaSpace.

Major advantage of MetaSpace over permgen:

PermGen was fixed in term of maximum size and can not grow dynamically but Metaspace can grow dynamically and do not have any size constraint.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 21. Difference between Intermediate and terminal operations in Stream.

Java 8 Stream supports both intermediate and terminal operation.

Intermediate operations are lazy in nature and do not get executed immediately. Terminal operations are not lazy, they are executed as soon as encountered.
Intermediate operation is memorized and is called when terminal operation is called.
All Intermediate operations return stream as it just transforms stream into another and terminal operation don't.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 22. Given the list of numbers, remove the duplicate elements from the list.

See the following code:

Integer[] arr=new Integer[]{1,2,3,4,3,2,4,2};

List<Integer> listWithDuplicates = Arrays.asList(arr);

Set<Integer> setWithoutDups = listWithDuplicates.stream().collect(Collectors.toSet());

setWithoutDups.forEach((i)->System.out.print(" "+i));

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 23. Difference between Stream findFirst() and findAny().

findFirst will always return the first element from the stream whereas findAny is allowed to choose any element from the stream.
findFirst has deterministic behavior whereas findAny is nondeterministic behavior.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 24. What is consumer function interface?

It is a functional interface defined in java.util.function package. It contains an abstract accept() and a default andThen() method. It can be used as the assignment target for a lambda expression or method reference.

Consumer is single argument functional interface which does not return any value.

public static void main(String[] args) {

Consumer<String> consumerString = s->System.out.println(s);

consumerString.accept("John");

}

We have created consumer object which takes String object as input and print it. It is simple use of Consumer interface to print String.

Output:

John

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 25. What is predicate function interface?

Predicate is single argument function which returns true or false. It has test method which returns boolean. Usually, it used to apply in a filter for a collection of objects.

public static void main(String[] args) {

Predicate<Integer> predicate = i -> i > 100;

boolean greaterCheck = predicate.test(200);

System.out.println("is 200 greater than 100: "+greaterCheck);

}

Output:

is 200 greater than 100: true

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 26. What Is a Stream? How Does It Differ from a Collection?

In simple terms, a stream is an iterator whose role is to accept a set of actions to apply on each of the elements it contains.
The stream represents a sequence of objects from a source such as a collection, which supports aggregate operations. They were designed to make collection processing simple and concise. Contrary to the collections, the logic of iteration is implemented inside the stream, so we can use methods like map and flatMap for performing a declarative processing.
And yet another important distinction from collections is that streams are inherently lazily loaded and processed.
Another difference is that the Stream API is fluent and allows pipelining:

int sum = Arrays.stream(new int[]{1, 2, 3})
.filter(i -> i >= 2)
.map(i -> i * 3)
.sum();

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 27. What Is the Difference Between Map and flatMap Stream Operation?

There is a difference in signature between map and flatMap. Generally speaking, a map operation wraps its return value inside its ordinal type while flatMap does not.
For example, in Optional, a map operation would return Optional<String> type while flatMap would return String type.
So after mapping, one needs to unwrap (read “flatten”) the object to retrieve the value whereas, after flat mapping, there is no such need as the object is already flattened. The same concept is applied to mapping and flat mapping in Stream.
Both map and flatMap are intermediate stream operations that receive a function and apply this function to all elements of a stream.
The difference is that for the map, this function returns a value, but for flatMap, this function returns a stream. The flatMap operation “flattens” the streams into one.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 28. What is Stream Pipelining in Java 8?

Stream pipelining is the concept of chaining operations together. This is done by splitting the operations that can happen on a stream into two categories: intermediate operations and terminal operations.
Each intermediate operation returns an instance of Stream itself when it runs, an arbitrary number of intermediate operations can, therefore, be set up to process data forming a processing pipeline.
There must then be a terminal operation which returns a final value and terminates the pipeline.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 29. What does the flatmap() function do? why you need it?

The flatmap function is an extension of the map function. Apart from transforming one object into another, it can also flatten it.

For example, if you have a list of the list but you want to combine all elements of lists into just one list. In this case, you can use flatMap() for flattening. At the same time, you can also transform an object like you do use map() function.

public static void main(String[] args) {

String[][] data = new String[][]{{"a", "b"}, {"c", "d"}, {"e", "f"}};

//Stream<String[]>

Stream<String[]> temp = Arrays.stream(data);

//Stream<String>, GOOD!

Stream<String> stringStream = temp.flatMap(x -> Arrays.stream(x));

Stream<String> stream = stringStream.filter(x -> "a".equals(x.toString()));

stream.forEach(System.out::println);

}

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Ques 30. What is the parallel Stream? How can you get a parallel stream from a List?

A parallel stream can parallel execute stream processing tasks. For example, if you have a parallel stream of 1 million orders and you are looking for orders worth more than 1 million, then you can use a filter to do that.

Unlike sequential Stream, the parallel Stream can launch multiple threads to search for those orders on the different part of Stream and then combine the result.

In short, the parallel Stream can paralyze execution.

Enregistrer pour revision

Ajoutez cet element aux favoris, marquez-le comme difficile ou placez-le dans un ensemble de revision.

Ouvrir ma bibliotheque d'apprentissage

Is it helpful? Yes No Add Comment View Comments

Most helpful rated by users:

Related differences

Java 7 vs Java 8	Java 8 vs Java 9

Related interview subjects

Log4j interview questions and answers - Total 35 questions
JBoss interview questions and answers - Total 14 questions
Java Mail interview questions and answers - Total 27 questions
Java Applet interview questions and answers - Total 29 questions
Google Gson interview questions and answers - Total 8 questions
Java 21 interview questions and answers - Total 21 questions
Apache Camel interview questions and answers - Total 20 questions
Struts interview questions and answers - Total 84 questions
RMI interview questions and answers - Total 31 questions
Java Support interview questions and answers - Total 30 questions
JAXB interview questions and answers - Total 18 questions
Apache Tapestry interview questions and answers - Total 9 questions
JSP interview questions and answers - Total 49 questions
Java Concurrency interview questions and answers - Total 30 questions
J2EE interview questions and answers - Total 25 questions
JUnit interview questions and answers - Total 24 questions
Java OOPs interview questions and answers - Total 30 questions
Java 11 interview questions and answers - Total 24 questions
JDBC interview questions and answers - Total 27 questions
Java Garbage Collection interview questions and answers - Total 30 questions
Spring Framework interview questions and answers - Total 53 questions
Java Swing interview questions and answers - Total 27 questions
Java Design Patterns interview questions and answers - Total 15 questions
JPA interview questions and answers - Total 41 questions
Java 8 interview questions and answers - Total 30 questions
Hibernate interview questions and answers - Total 52 questions
JMS interview questions and answers - Total 64 questions
JSF interview questions and answers - Total 24 questions
Java 17 interview questions and answers - Total 20 questions
Spring Boot interview questions and answers - Total 50 questions
Servlets interview questions and answers - Total 34 questions
Kotlin interview questions and answers - Total 30 questions
EJB interview questions and answers - Total 80 questions
Java Beans interview questions and answers - Total 57 questions
Java Exception Handling interview questions and answers - Total 30 questions
Java 15 interview questions and answers - Total 16 questions
Apache Wicket interview questions and answers - Total 26 questions
Core Java interview questions and answers - Total 306 questions
Java Multithreading interview questions and answers - Total 30 questions

All interview subjects

LINQ interview questions and answers - Total 20 questions
C# interview questions and answers - Total 41 questions
ASP .NET interview questions and answers - Total 31 questions
Microsoft .NET interview questions and answers - Total 60 questions
ASP interview questions and answers - Total 82 questions
Google Cloud AI interview questions and answers - Total 30 questions
IBM Watson interview questions and answers - Total 30 questions
Perplexity AI interview questions and answers - Total 40 questions
ChatGPT interview questions and answers - Total 20 questions
NLP interview questions and answers - Total 30 questions
AI Agents (Agentic AI) interview questions and answers - Total 50 questions
OpenCV interview questions and answers - Total 36 questions
Amazon SageMaker interview questions and answers - Total 30 questions
TensorFlow interview questions and answers - Total 30 questions
Hugging Face interview questions and answers - Total 30 questions
Gemini AI interview questions and answers - Total 50 questions
Oracle AI Agents interview questions and answers - Total 50 questions
Artificial Intelligence (AI) interview questions and answers - Total 47 questions
Machine Learning interview questions and answers - Total 30 questions
Python Coding interview questions and answers - Total 20 questions
Scala interview questions and answers - Total 48 questions
Swift interview questions and answers - Total 49 questions
Golang interview questions and answers - Total 30 questions
Embedded C interview questions and answers - Total 30 questions
C++ interview questions and answers - Total 142 questions
VBA interview questions and answers - Total 30 questions
COBOL interview questions and answers - Total 50 questions
R Language interview questions and answers - Total 30 questions
CCNA interview questions and answers - Total 40 questions
Oracle APEX interview questions and answers - Total 23 questions
Oracle Cloud Infrastructure (OCI) interview questions and answers - Total 100 questions
AWS interview questions and answers - Total 87 questions
Microsoft Azure interview questions and answers - Total 35 questions
Azure Data Factory interview questions and answers - Total 30 questions
OpenStack interview questions and answers - Total 30 questions
ServiceNow interview questions and answers - Total 30 questions
Snowflake interview questions and answers - Total 30 questions
LGPD interview questions and answers - Total 20 questions
PDPA interview questions and answers - Total 20 questions
OSHA interview questions and answers - Total 20 questions
HIPPA interview questions and answers - Total 20 questions
PHIPA interview questions and answers - Total 20 questions
FERPA interview questions and answers - Total 20 questions
DPDP interview questions and answers - Total 30 questions
PIPEDA interview questions and answers - Total 20 questions
GDPR interview questions and answers - Total 30 questions
CCPA interview questions and answers - Total 20 questions
HITRUST interview questions and answers - Total 20 questions
PoowerPoint interview questions and answers - Total 50 questions
Data Structures interview questions and answers - Total 49 questions
Computer Networking interview questions and answers - Total 65 questions
Microsoft Excel interview questions and answers - Total 37 questions
Computer Basics interview questions and answers - Total 62 questions
Computer Science interview questions and answers - Total 50 questions
Operating System interview questions and answers - Total 22 questions
MS Word interview questions and answers - Total 50 questions
Tips and Tricks interview questions and answers - Total 30 questions
Pandas interview questions and answers - Total 30 questions
Deep Learning interview questions and answers - Total 29 questions
Flask interview questions and answers - Total 40 questions
PySpark interview questions and answers - Total 30 questions
PyTorch interview questions and answers - Total 25 questions
Data Science interview questions and answers - Total 23 questions
SciPy interview questions and answers - Total 30 questions
Generative AI interview questions and answers - Total 30 questions
NumPy interview questions and answers - Total 30 questions
Python interview questions and answers - Total 106 questions
Python Pandas interview questions and answers - Total 48 questions
Django interview questions and answers - Total 50 questions
Python Matplotlib interview questions and answers - Total 30 questions
Redis Cache interview questions and answers - Total 20 questions
MySQL interview questions and answers - Total 108 questions
Data Modeling interview questions and answers - Total 30 questions
MariaDB interview questions and answers - Total 40 questions
DBMS interview questions and answers - Total 73 questions
Apache Hive interview questions and answers - Total 30 questions
PostgreSQL interview questions and answers - Total 30 questions
SSIS interview questions and answers - Total 30 questions
Teradata interview questions and answers - Total 20 questions
SQL Query interview questions and answers - Total 70 questions
SQLite interview questions and answers - Total 53 questions
Cassandra interview questions and answers - Total 25 questions
Neo4j interview questions and answers - Total 44 questions
MSSQL interview questions and answers - Total 50 questions
OrientDB interview questions and answers - Total 46 questions
Data Warehouse interview questions and answers - Total 20 questions
SQL interview questions and answers - Total 152 questions
IBM DB2 interview questions and answers - Total 40 questions
Elasticsearch interview questions and answers - Total 61 questions
Data Mining interview questions and answers - Total 30 questions
Oracle interview questions and answers - Total 34 questions
MongoDB interview questions and answers - Total 27 questions
AWS DynamoDB interview questions and answers - Total 46 questions
Entity Framework interview questions and answers - Total 46 questions
Data Engineer interview questions and answers - Total 30 questions
AutoCAD interview questions and answers - Total 30 questions
Robotics interview questions and answers - Total 28 questions
Power System interview questions and answers - Total 28 questions
Electrical Engineering interview questions and answers - Total 30 questions
Verilog interview questions and answers - Total 30 questions
VLSI interview questions and answers - Total 30 questions
Software Engineering interview questions and answers - Total 27 questions
MATLAB interview questions and answers - Total 25 questions
Digital Electronics interview questions and answers - Total 38 questions
Civil Engineering interview questions and answers - Total 30 questions
Electrical Machines interview questions and answers - Total 29 questions
Oracle CXUnity interview questions and answers - Total 29 questions
Web Services interview questions and answers - Total 10 questions
Salesforce Lightning interview questions and answers - Total 30 questions
IBM Integration Bus interview questions and answers - Total 30 questions
Power BI interview questions and answers - Total 24 questions
OIC interview questions and answers - Total 30 questions
Dell Boomi interview questions and answers - Total 30 questions
Web API interview questions and answers - Total 31 questions
IBM DataStage interview questions and answers - Total 20 questions
Talend interview questions and answers - Total 34 questions
Salesforce interview questions and answers - Total 57 questions
TIBCO interview questions and answers - Total 30 questions
Informatica interview questions and answers - Total 48 questions
Log4j interview questions and answers - Total 35 questions
JBoss interview questions and answers - Total 14 questions
Java Mail interview questions and answers - Total 27 questions
Java Applet interview questions and answers - Total 29 questions
Google Gson interview questions and answers - Total 8 questions
Java 21 interview questions and answers - Total 21 questions
Apache Camel interview questions and answers - Total 20 questions
Struts interview questions and answers - Total 84 questions
RMI interview questions and answers - Total 31 questions
Java Support interview questions and answers - Total 30 questions
JAXB interview questions and answers - Total 18 questions
Apache Tapestry interview questions and answers - Total 9 questions
JSP interview questions and answers - Total 49 questions
Java Concurrency interview questions and answers - Total 30 questions
J2EE interview questions and answers - Total 25 questions
JUnit interview questions and answers - Total 24 questions
Java OOPs interview questions and answers - Total 30 questions
Java 11 interview questions and answers - Total 24 questions
JDBC interview questions and answers - Total 27 questions
Java Garbage Collection interview questions and answers - Total 30 questions
Spring Framework interview questions and answers - Total 53 questions
Java Swing interview questions and answers - Total 27 questions
Java Design Patterns interview questions and answers - Total 15 questions
JPA interview questions and answers - Total 41 questions
Java 8 interview questions and answers - Total 30 questions
Hibernate interview questions and answers - Total 52 questions
JMS interview questions and answers - Total 64 questions
JSF interview questions and answers - Total 24 questions
Java 17 interview questions and answers - Total 20 questions
Spring Boot interview questions and answers - Total 50 questions
Servlets interview questions and answers - Total 34 questions
Kotlin interview questions and answers - Total 30 questions
EJB interview questions and answers - Total 80 questions
Java Beans interview questions and answers - Total 57 questions
Java Exception Handling interview questions and answers - Total 30 questions
Java 15 interview questions and answers - Total 16 questions
Apache Wicket interview questions and answers - Total 26 questions
Core Java interview questions and answers - Total 306 questions
Java Multithreading interview questions and answers - Total 30 questions
Pega interview questions and answers - Total 30 questions
ITIL interview questions and answers - Total 25 questions
Finance interview questions and answers - Total 30 questions
JIRA interview questions and answers - Total 30 questions
SAP MM interview questions and answers - Total 30 questions
SAP ABAP interview questions and answers - Total 24 questions
SCCM interview questions and answers - Total 30 questions
Tally interview questions and answers - Total 30 questions
Ionic interview questions and answers - Total 32 questions
Android interview questions and answers - Total 14 questions
Mobile Computing interview questions and answers - Total 20 questions
Xamarin interview questions and answers - Total 31 questions
iOS interview questions and answers - Total 52 questions
Laravel interview questions and answers - Total 30 questions
XML interview questions and answers - Total 25 questions
GraphQL interview questions and answers - Total 32 questions
Bitcoin interview questions and answers - Total 30 questions
Active Directory interview questions and answers - Total 30 questions
Microservices interview questions and answers - Total 30 questions
Apache Kafka interview questions and answers - Total 38 questions
Tableau interview questions and answers - Total 20 questions
Adobe AEM interview questions and answers - Total 50 questions
Kubernetes interview questions and answers - Total 30 questions
OOPs interview questions and answers - Total 30 questions
Fashion Designer interview questions and answers - Total 20 questions
Desktop Support interview questions and answers - Total 30 questions
IAS interview questions and answers - Total 56 questions
PHP OOPs interview questions and answers - Total 30 questions
Nursing interview questions and answers - Total 40 questions
Linked List interview questions and answers - Total 15 questions
Dynamic Programming interview questions and answers - Total 30 questions
SharePoint interview questions and answers - Total 28 questions
CICS interview questions and answers - Total 30 questions
Yoga Teachers Training interview questions and answers - Total 30 questions
Language in C interview questions and answers - Total 80 questions
Behavioral interview questions and answers - Total 29 questions
School Teachers interview questions and answers - Total 25 questions
Full-Stack Developer interview questions and answers - Total 60 questions
Statistics interview questions and answers - Total 30 questions
Digital Marketing interview questions and answers - Total 40 questions
Apache Spark interview questions and answers - Total 24 questions
VISA interview questions and answers - Total 30 questions
IIS interview questions and answers - Total 30 questions
System Design interview questions and answers - Total 30 questions
SEO interview questions and answers - Total 51 questions
Google Analytics interview questions and answers - Total 30 questions
Cloud Computing interview questions and answers - Total 42 questions
BPO interview questions and answers - Total 48 questions
ANT interview questions and answers - Total 10 questions
Agile Methodology interview questions and answers - Total 30 questions
HR Questions interview questions and answers - Total 49 questions
REST API interview questions and answers - Total 52 questions
Content Writer interview questions and answers - Total 30 questions
SAS interview questions and answers - Total 24 questions
Control System interview questions and answers - Total 28 questions
Mainframe interview questions and answers - Total 20 questions
Hadoop interview questions and answers - Total 40 questions
Banking interview questions and answers - Total 20 questions
Checkpoint interview questions and answers - Total 20 questions
Blockchain interview questions and answers - Total 29 questions
Technical Support interview questions and answers - Total 30 questions
Sales interview questions and answers - Total 30 questions
Nature interview questions and answers - Total 20 questions
Chemistry interview questions and answers - Total 50 questions
Docker interview questions and answers - Total 30 questions
SDLC interview questions and answers - Total 75 questions
Cryptography interview questions and answers - Total 40 questions
RPA interview questions and answers - Total 26 questions
Interview Tips interview questions and answers - Total 30 questions
College Teachers interview questions and answers - Total 30 questions
Blue Prism interview questions and answers - Total 20 questions
Memcached interview questions and answers - Total 28 questions
GIT interview questions and answers - Total 30 questions
Algorithm interview questions and answers - Total 50 questions
Business Analyst interview questions and answers - Total 40 questions
Splunk interview questions and answers - Total 30 questions
DevOps interview questions and answers - Total 45 questions
Accounting interview questions and answers - Total 30 questions
SSB interview questions and answers - Total 30 questions
OSPF interview questions and answers - Total 30 questions
Sqoop interview questions and answers - Total 30 questions
JSON interview questions and answers - Total 16 questions
Accounts Payable interview questions and answers - Total 30 questions
Computer Graphics interview questions and answers - Total 25 questions
IoT interview questions and answers - Total 30 questions
Insurance interview questions and answers - Total 30 questions
Scrum Master interview questions and answers - Total 30 questions
Express.js interview questions and answers - Total 30 questions
Ansible interview questions and answers - Total 30 questions
ES6 interview questions and answers - Total 30 questions
Electron.js interview questions and answers - Total 24 questions
RxJS interview questions and answers - Total 29 questions
NodeJS interview questions and answers - Total 30 questions
ExtJS interview questions and answers - Total 50 questions
jQuery interview questions and answers - Total 22 questions
Vue.js interview questions and answers - Total 30 questions
Svelte.js interview questions and answers - Total 30 questions
Shell Scripting interview questions and answers - Total 50 questions
Next.js interview questions and answers - Total 30 questions
Knockout JS interview questions and answers - Total 25 questions
TypeScript interview questions and answers - Total 38 questions
PowerShell interview questions and answers - Total 27 questions
Terraform interview questions and answers - Total 30 questions
JCL interview questions and answers - Total 20 questions
JavaScript interview questions and answers - Total 59 questions
Ajax interview questions and answers - Total 58 questions
Ethical Hacking interview questions and answers - Total 40 questions
Cyber Security interview questions and answers - Total 50 questions
PII interview questions and answers - Total 30 questions
Data Protection Act interview questions and answers - Total 20 questions
BGP interview questions and answers - Total 30 questions
Ubuntu interview questions and answers - Total 30 questions
Linux interview questions and answers - Total 43 questions
Unix interview questions and answers - Total 105 questions
Weblogic interview questions and answers - Total 30 questions
Tomcat interview questions and answers - Total 16 questions
Glassfish interview questions and answers - Total 8 questions
TestNG interview questions and answers - Total 38 questions
Postman interview questions and answers - Total 30 questions
SDET interview questions and answers - Total 30 questions
Selenium interview questions and answers - Total 40 questions
Kali Linux interview questions and answers - Total 29 questions
Mobile Testing interview questions and answers - Total 30 questions
UiPath interview questions and answers - Total 38 questions
Quality Assurance interview questions and answers - Total 56 questions
API Testing interview questions and answers - Total 30 questions
Appium interview questions and answers - Total 30 questions
ETL Testing interview questions and answers - Total 20 questions
Cucumber interview questions and answers - Total 30 questions
QTP interview questions and answers - Total 44 questions
PHP interview questions and answers - Total 27 questions
Oracle JET(OJET) interview questions and answers - Total 54 questions
Frontend Developer interview questions and answers - Total 30 questions
Zend Framework interview questions and answers - Total 24 questions
RichFaces interview questions and answers - Total 26 questions
HTML interview questions and answers - Total 27 questions
Flutter interview questions and answers - Total 25 questions
CakePHP interview questions and answers - Total 30 questions
React interview questions and answers - Total 40 questions
React Native interview questions and answers - Total 26 questions
Angular JS interview questions and answers - Total 21 questions
Web Developer interview questions and answers - Total 50 questions
Angular 8 interview questions and answers - Total 32 questions
Dojo interview questions and answers - Total 23 questions
Symfony interview questions and answers - Total 30 questions
GWT interview questions and answers - Total 27 questions
CSS interview questions and answers - Total 74 questions
Ruby On Rails interview questions and answers - Total 74 questions
Yii interview questions and answers - Total 30 questions
Angular interview questions and answers - Total 50 questions

Developpez vos competences grace a des parcours cibles, des tests blancs et un contenu pret pour l'entretien.

Interview Questions and Answers

Ques 1. What are main advantages of using Java 8?

Enregistrer pour revision

Ques 2. What is the difference between Predicate and Function?

Enregistrer pour revision

Freshers / Beginner level questions & answers

Ques 3. What are new features which got introduced in Java 8?

Enregistrer pour revision

Ques 4. Can you explain the syntax of Lambda expression?

Enregistrer pour revision

Ques 5. What are functional interfaces?

Enregistrer pour revision

Ques 6. What Is a Default Method and When Do We Use It?

Enregistrer pour revision

Ques 7. What is Optional and how can we use it?

Enregistrer pour revision

Ques 8. Provide some APIs of Java 8 Date and Time.

Enregistrer pour revision

Ques 9. How will you get current date and time using Java 8 Date and TIme API?

Enregistrer pour revision

Intermediate / 1 to 5 years experienced level questions & answers

Ques 10. What is lambda expression?

Enregistrer pour revision

Ques 11. Given a list of employees, sort all the employee on the basis of age by using java 8 APIs only.

Enregistrer pour revision

Ques 12. Given the list of employees, find the employee with name 'John' using Java 8 API.

Enregistrer pour revision

Ques 13. Given a list of employee, find maximum age of employee using Java 8 API.

Enregistrer pour revision

Ques 14. Provide some examples of Intermediate operations.

Enregistrer pour revision

Ques 15. Provide some examples of Terminal operations.

Enregistrer pour revision

Experienced / Expert level questions & answers

Ques 16. How lambda expression and functional interfaces are related?

Enregistrer pour revision

Ques 17. Can you create your own functional interface?

Enregistrer pour revision

Ques 18. What is method reference in java 8?

Enregistrer pour revision

Ques 19. What the issues with Old Date and time API before Java 8? Date and Time API differences between Java 8 and earlier Java version.

Enregistrer pour revision

Ques 20. Do we have PermGen in Java 8? What is MetaSpace in Java 8?

Enregistrer pour revision

Ques 21. Difference between Intermediate and terminal operations in Stream.

Enregistrer pour revision

Ques 22. Given the list of numbers, remove the duplicate elements from the list.

Enregistrer pour revision

Ques 23. Difference between Stream findFirst() and findAny().

Enregistrer pour revision

Ques 24. What is consumer function interface?

Enregistrer pour revision

Ques 25. What is predicate function interface?

Enregistrer pour revision

Ques 26. What Is a Stream? How Does It Differ from a Collection?

Enregistrer pour revision

Ques 27. What Is the Difference Between Map and flatMap Stream Operation?

Enregistrer pour revision

Ques 28. What is Stream Pipelining in Java 8?

Enregistrer pour revision

Ques 29. What does the flatmap() function do? why you need it?

Enregistrer pour revision

Ques 30. What is the parallel Stream? How can you get a parallel stream from a List?

Enregistrer pour revision

Related differences

Related interview subjects

All interview subjects

WithoutBook