Top 15 Java Web Service Interview Questions with Answers

Java Web Services Questions and Answers
Web Services interview questions are part of J2EE interviews for jobs which are looking for some experience in Java web services Space. Most of the Web services questions come from two different ways of implementing Web Services like SOAP and REST. SOAP is standard and mature way of calling Web Services which uses XML while REST is a new way of implementing Web Services which is based on HTTP protocol. In fact REST Web Service interview questions are getting more and more popular on the web services interviews in Java, So if you are going for any Java J2EE interview which require some web service experience, be prepared with both SOAP and REST Web services questions.

Top 5 Books to Learn Web Development for Beginners in 2022 - Best of Lot

Having a career in web development can be a fun and fabulous experience. There are a lot of online videos on YouTube or paid courses to teach you this field, but not all people are fan of videos and many of us like to learn from books. So I’ve collected some of the best web development books to help you learn this field in a small amount of time and even maybe get a real job after completing them. While I also advocate a hybrid approach where you can start with these free web development online courses first to learn the 20% stuff which are used 80% of time and then move to books, but its totally up to you. 

10 Best Udemy Courses of Tim Buchalaka for Java and Python Programmers

Hello guys if you are looking for best Udemy courses for Java developers, mostly from Tim Buchalaka then you have come to the right place. For those of you who don't know, Tim Buchalaka is a highly-experienced software developer. During his long glittering career, he has worked for a lot of major companies like Fujitsu, Mitsubishi, and Saab. Tim Buchalaka's amazing video lectures have been used to train software developers in major companies like Mercedes-Benz, PayPal, VW, Pitney Bowers, IBM, and T-Mobile. What sets Tim apart from loads of other instructors is the fact that most of those instructors have never been professional programmers. They also cannot boast about a distinguished professional development career like him.

2 Ways to solve FizzBuzz in Java? [Example]

Hello guys, if you are learning to code or preparing for interviews and looking how to solve the FizzBuzz problem in Java then you have come to the right place. Earlier, I have shared 75 programming exercises and in this article, I will teach you how to solve the FizzBuzz problem in Java. FizzBuzz is one of the most frequently asked questions on programming interviews and used to filter candidates on Coding interviews who can't code. It looks extremely simple but it's tricky for those programmers or coders who struggle to structure their code or lack the ability to convert a simple algorithm into code. 

Difference between HashMap vs TreeMap vs LinkedHashMap in Java

Though all three classes like HashMap, LinkedHashMap and TreeMap are implementation of java.util.Map interface, there is some functional difference between them. Perhaps most notable difference between them comes from their iteration order. HashMap makes absolute no guarantee about in which order you can iterate their keys, any application depending upon iteration order of HashMap is fragile, because it can change anytime. Infact, in Java 7, iteration order of HashMap is different than Java 6. On the other hand TreeMap is a SoretedMap and keeps their key in particular sorted order, enforced by either natural order of keys or Comparator instance provided during construction of TreeMap. 

Top 5 Books To Learn Machine Learning and AI in 2022

Hello guys if you want to learn Machine Learning and Artificial Intelligence and looking for best books then you have come to the right place. Earlier, I have shared best Machine learning and AI courses and today, I am going to share best books you can read to learn Machine Learning and AI in 2022. Machine learning is considered a subset of artificial intelligence. They are used a lot in our daily lives, like in google, to give you the search results to the YouTube recommendation videos and amazon recommendations for shopping. It is also used for self-driving cars and googles assistance. Basically, it will take the data, learn from it, and give you the result from unseen data later.

How to Find Highest Repeating Word from a File in Java [Word Count Solution]

Hello guys, if you are looking for a Java program to print the word and their count from a given file then you have come to the right place. Earlier, I have shared 100+ Data Strucutre and Algorithms Problems from interviews and in this article, I will show you how to find worlds and their count from a given file in Java. How to find the word and their count from a text file is another frequently asked coding question from Java interviews. The logic to solve this problem is similar to what we have seen in how to find duplicate words in a String, where we iterate through string and store word and their count on a hash table and increment them whenever we encounter the same word. 

10 Best Udemy Courses Of Rob Percival to Learn Python, JavaScript and Tech skills

Helo guys, if you are looking for best online courses by Rob Percvial, one of the Udemy's top instructor to learn web development, Python, JavaScript, and Node.js then you have come to the right place. In the past, I have shared best online courses by Jose Portilla, Stephen Grider, Maximillian SchwarzMuller, Stephane Maarek and Brad Traversy and in this article, I am going to share best online course by Ro Percival, one of the top Udemy instructor and my favorite. But, before we start with the 10 best Udemy courses from Rob Percival, let me tell you who Rob is.

How to Check if Given Number is Prime in Java - With Example

Hello guys, today, we are going to discuss one of the most common programming exercises for beginners is, write a program to check if a given number is prime or not? There are many ways to check if a number is prime or not, but the most common of them is the trial division, which is what we will see in this tutorial. In my opinion, these kinds of programs are their first steps towards algorithmic understanding. You first come up with a solution, which is driven by the fact that prime numbers are natural numbers, that are not divisible by any positive number other than 1 and themselves. Then, you write a for loop to check every number, starting from 1 to a given number, to see if the given number is divisible by any positive number or not. This leads you to the solution.

What is window function in SQL with Examples? How and when to use them?

Hello folks, if you are wondering what is window function and what problem does it solve then you have to the right place. In this article, I would be explaining the windows functions with examples, how it works, and when you need to use it. Firstly what is a Window Function in SQL? A window function performs a calculation across a set of table rows that are similarly related to the current row. The current row is the row in which function evaluation occurs. This is comparable to the type of calculation that can be done with an aggregate function. But unlike regular aggregate functions like sum, avg, max, and min, that perform operations on an entire table.

[Solved] How to Find 2 Largest Number from Integer Array in Java with Example

Hello guys, I have been sharing a lot of Programming interview questions and coding problems to learn programming better which is appreciated by you guys. In this post, I have come with other simple programming problems for Java beginners. I love to share short programming problems because they help in developing programming sense. Many people will argue against simple problems like prime numbers, palindrome, and factorial, but I really find them useful, especially for beginners. A beginner is far away to solve a complex data structure problem or even more complex problems like those that appear in TopCoder or other programming sites. Programmers learn gradually and they need the joy of doing something and seeing results much quicker than any other. Small success motivates them.

10 Best Udemy Courses of Stephen Grider

Hello guys, if you are looking to learn web development or app development then there is a good chance that you may heard about Stephen Grider, one of the best Udemy instructor when it comes to teaching web development technologies. In the past, I have shared best online courses by Jose Portilla, Maximillian SchwarzMuller, Stephane Maarek and Brad Traversy and in this article, I am going to share best online course by Stephen Grider. But, First things first. before I tell you about the 10 best Udemy courses of Stephen Grider, let me tell you who the man really is.

3 Examples to convert a Map to List in Java 8 - Example Tutorial

Hello guys, when you convert a Map to List in Java 8 or before, you have three choices like you can get a list of keys from Map, a List of values from Map, or a List of entries from Map, which encapsulates both keys and values. The API doesn't provide these methods because Map doesn't guarantee any order and the List interface guarantees ordering, like insertion order. Hence, JDK API provides an equivalent method to convert a Map to Set, like keySet() will return a set of keys and entrySet() will return a set of entries.

Java 8 Predicate and Lambda Expression Example

Hello guys, if you want to learn about Predicates in Java 8 and looking for examples then you have come to the right place. In the past, I have explained key Java 8 concepts and classes like Stream, Optional, Collectors etc and we have seen how to use those functional methods like map, filter, and flatmap and in this article, I will show you how to use Predicates in Java 8 with Lambda expression. If you don't know Predicate is a functional interface in Java. A functional interface is nothing but a function with one abstract method or annotated by @FunctionalInterface annotation. Predicate is a functional interface with a function which accepts an object and return Boolean. 

[Solved] How to Check If a Given String has No Duplicate Characters in Java? Unique Example

Hello guys, if you are looking to solve the classic problem "checking if a String has all Unique characters" or not then you have come to the right place. Earlier, I have shown you how to reverse String in place, and in this article, I will show you how to check for unique and duplicate characters in String.  You need to write a program to determine if a given string has all unique characters or not. For example input= "Java" then your function should return false because all characters are not unique, and if the input is "Python" then your program should return true because all characters in Python are unique.

How to Find Greatest Common Divisor of two numbers in Java - [ Euclid's algorithm GCD Example]

How to find the Greatest Common Divisor of two numbers in Java

Simple Java program to find GCD (Greatest Common Divisor) or GCF  (Greatest Common Factor) or HCF (Highest common factor). The GCD of two numbers is the largest positive integer that divides both the numbers fully i.e. without any remainder. There are multiple methods to find GCD, GDF, or HCF of two numbers but  Euclid's algorithm is very popular and easy to understand, of course, only if you understand how recursion works. Euclid's algorithm is an efficient way to find the GCD of two numbers and it's pretty easy to implement using recursion in the Java program. According to Euclid's method GCD of two numbers, a, b is equal to GCD(b, a mod b) and GCD(a, 0) = a.

How to Convert a Stream to List, Set, and Map in Java? Example Tutorial

Hello guys, if you are wondering how to convert a Java Stream to Java Collections like List, Set and Map then you have come to the right place. Earlier, I have shared free Java Courses for beginners and in this article, I am going to share examples to convert Stream to ArrayList, LinkedList, HashSet, TreeSet, LinkedHashSet, TreeMap, HashMap, and ConcurrentHashMap in Java. These are easy-to-follow examples and suitable for both beginners and experienced Java programmers.  In Java 8, Stream is one of the most important classes as it allows a lot of useful functional operations like filter, map, flatmap, etc on a collection of objects. Hence, going forward converting a Collection to Stream, performing operations, and then converting the result back to different Collection classes like List, Set, and Map will be a common task. 

How to solve Two Sum Array Problem in Java? Example

Hello guys, if you have been solving data structure and algorithms problems or been through a couple of coding interviews then you might be familiar with the classical "Two Sum" problem. It's one of the classical coding problems of finding two numbers in a given array whose sum is equal to a given target number. It's a good problem to learn how array data structure works and programming basics like loops, conditionals, and operators. It's also good for developing your problem-solving skills and coding sense, which will help you in the long run. This is also a popular Leetcode problem and is commonly asked in coding interviews to both beginners and intermediate programmers.

How to convert String ArrayList to Array in Java? Example

Converting String ArrayList into String array is very common programming task in Java. you often need to convert Array to Array List in Java  and vice-versa. In this Java program, we will How to convert String ArrayList to String array. This is also a common programming exercise which is asked too many Java programmers in various Java related courses. It’s also worth noting that ArrayList in Java is internally backed by array and Array in Java are objects much like String which is also an Object in Java. 

Top 5 books to Learn AWS in 2022 - best of Lot

Cloud services have become a trend in recent years. More and more organizations are moving to cloud services. Amazon Web Services, commonly knowns as AWS is by far the most popular cloud service.

AWS is an on-demand pay-as-you-go pricing service. It offers several products in various domains such as compute and networking services, storage and content delivery services, security and identity services, database services, analytics services, application services, and management tools. Moreover, understanding AWS is easier as compared to other services. It is very user-friendly.

It is worth learning AWS. There are many job opportunities in the market. AWS can be learned from various resources such as the internet and books. While the internet can give better exposure, books are a better option if you want to dive deep into the concepts. In this article, we will list the top five books to learn Amazon Web Services.

5 Best Books to learn AWS And Cloud Computing in 2022

 Without wasting anymore of your time, here is a list of best books to learn AWS in 2022

1. Amazon Web Services in Action 

This book is written by Andreas Wittig and Michael Wittig who migrated the first bank of Germany to AWS in 2013. It is one of the finest books for learning AWS. In this book, the authors covered all the essential AWS services focusing on security, automation, scalability, and high availability. 

The second edition of the book includes all the latest AWS additions such as serverless infrastructure with AWS Lambda, in-memory storage with ElastiCache, and sharing data with EFS.

The book is for mid-level developers and DevOps.

 

3. Amazon Web Services Bootcamp

Written by Sunil Gulabani, the Amazon Web Services Bootcamp: Develop a scalable, reliable, and highly available cloud environment with AWS book focuses on building and managing highly reliable and scalable applications and services on AWS. 

It includes all the essential skills to design, deploy, and manage applications and services on the AWS. The book also contains easy-to-follow, hands-on steps, recommendations, and tips.

The book is for IT professionals with basic knowledge of the cloud and AWS (optional).

4. AWS: The Ultimate Guide From Beginners To Advanced

The latest edition of AWS: The Ultimate Guide From Beginners To Advanced For The Amazon Web Services (2020 Edition) book by Theo H. King will teach you all the essentials of AWS. This book starts from the very basics of AWS and then gradually moves to the advanced topics. 

The major topics covered in this book are using development tools of AWS for your advantages, upgrading outsourcing, implementing AWS technologies, and many more.

This book is for IT professionals with basic knowledge of the cloud (optional).

 

4. Learning Amazon Web Services (AWS): A Hands-On Guide to the Fundamentals of AWS Cloud

This book is written by Mark Wilkins who is a top AWS trainer and evangelist. In this book, you will find every essential concept that is required to master AWS. It has hands-on practices that will help you understand Amazon Web Services in real-time. The author tries to present AWS as a big picture covering AWS fundamentals.

This book is for those developers who want to understand AWS with hands-on practices.

5. Machine Learning in the AWS Cloud: Add Intelligence to Applications with Amazon SageMaker and Amazon Rekognition

Machine learning is another powerful technology. It can be used with AWS and this book is for those who want to use machine learning with AWS. Authored by Abhishek Mishra, this book not only covers the essentials of Amazon Web Services, but also the essentials and fundamentals of machine learning. The book is divided into two parts - part one covers machine learning while part two covers the machine learning services of AWS.

This book is for those who want to learn the machine learning services of AWS.

That's all about the best books to learn AWS for Beginners in 2022. So as mentioned earlier, the AWS can be learned from various sources but books are a better choice for diving in depth. In this article, we listed the top five books that will help you understand and learn Amazon Web Services. Almost every book mentioned in this article requires no prior knowledge of AWS. Go through the description and choose accordingly.