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MORE OPTIONSAGREE JAVAREVISITED Blog about Java, Programming, Spring, Hibernate, Interview Questions, Books and Online Course Recommendations from Udemy, Pluralsight, Coursera, etc Flipboard LinkedIn PAGES * Home * core java * spring * hibernate * collections * multithreading * design patterns * interview questions * coding * data structure * OOP * java 8 * books * About Me * Java Certifications * JDBC * jsp-servlet * JSON * SQL * Linux * Courses * online resources * jvm-internals * REST * Eclipse * jQuery * Java IO * Java XML TUESDAY, OCTOBER 19, 2021 TOP 10 COURSES TO LEARN JAVASCRIPT IN 2021 - BEST OF LOT There is no doubt that JavaScript is the most popular programming language at this moment, and it's also confirmed by StackOverFlow's Survey. You can build static websites, web applications, native mobile applications (yes, you can do that too), desktop applications, and even server-side applications in JavaScript. It also makes you a hundred times more employer as there are tons of web development jobs out there. Because of that, more and more developers are learning JavaScript to become web developers. Video Player is loading. Play Video Play Unmute Current Time 0:00 / Duration 52:08 Loaded: 1.14% 00:00 Stream Type LIVE Seek to live, currently behind liveLIVE Remaining Time -52:08 1x Playback Rate Chapters * Chapters Descriptions * descriptions off, selected Captions * captions settings, opens captions settings dialog * captions off, selected Audio Track * default, selected Picture-in-PictureFullscreen This is a modal window. Beginning of dialog window. Escape will cancel and close the window. TextColorWhiteBlackRedGreenBlueYellowMagentaCyanTransparencyOpaqueSemi-TransparentBackgroundColorBlackWhiteRedGreenBlueYellowMagentaCyanTransparencyOpaqueSemi-TransparentTransparentWindowColorBlackWhiteRedGreenBlueYellowMagentaCyanTransparencyTransparentSemi-TransparentOpaque Font Size50%75%100%125%150%175%200%300%400%Text Edge StyleNoneRaisedDepressedUniformDropshadowFont FamilyProportional Sans-SerifMonospace Sans-SerifProportional SerifMonospace SerifCasualScriptSmall Caps Reset restore all settings to the default valuesDone Close Modal Dialog End of dialog window. Advertisement Read more » By javin paul at October 19, 2021 1 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: courses , JavaScript , online resources TOP 5 FREE CYBER SECURITY COURSES FOR BEGINNERS TO LEARN IN 2021 - BEST OF LOT Hello guys, if you want to learn Cyber Security and start your career as a SEcurity expert or just want to improve your knowledge about Cyber Security, Information Security, Web Servuciry, and Computer Security then you have come to the right place. Earlier, I have shared the best Cyber Security Courses and best Web Security courses and in this article, I am going to share free online courses to learn Cyber Security, This is in line with your demand as many people asked me to share free courses for Cyber Security when I shared the best-paid courses. So, here we go, In this article, I have compiled free Cyber Security courses from Udemy, Coursera, and edX and they are absolutely free to learn and join. Read more » By javin paul at October 19, 2021 0 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: courses , Cyber Security , free resources , security 3 WAYS TO PREVENT METHOD OVERRIDING IN JAVA - PRIVATE, STATIC AND FINAL METHOD EXAMPLE TUTORIAL Every Java programmer knows that final modifier can be used to prevent method overriding in Java because there is no way someone can override final methods; but, apart from final modifier, is there any other way to prevent method overriding in Java? This was the exact question, asked to one of my friend in a recent Java interview at one of the leading Investment bank. I guess, he was lucky to get this question because he already knows those tricks and was able to answer it quickly. When he told me about his experience, I didn't understand why someone ask this question? What is the purpose? What they were trying to find out? I can understand if they have asked what's the best way to prevent method overriding in Java, or what is the risk of overriding? Read more » By javin paul at October 19, 2021 3 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: core java interview question WHY JAVA PROGRAMMERS SHOULD LEARN DOCKER AND KUBERNETES IN 2021 Hello Java Programmers, if you are looking to learn some in-demand software tools to improve your profile then you have come to the right place. Earlier, I have shared the best tools for Java developers and today, I am extending it to all developers. Along with Docker, if there is another tool or technology which has caught software developers' attention in recent times then it must be Kubernetes. Actually, it's often mentioned alongside Docker becuase it takes what Docker offers to the next level. If you don't know what is Docker and Kubernetes let me give you a brief overview before going deep into why every programmer should learn Kubernetes. Read more » By javin paul at October 19, 2021 0 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: best of javarevisited , Docker , Kubernetes 10 EXAMPLES OF OPTIONAL IN JAVA 8 Null is bad, it can crash your program. Even its creator called it a billion-dollar mistake hence you should always try to avoid using nulls whenever you can. For example, you should not return a null String when you can return an empty String, similarly never return null collections when you can return an empty collection. I have shared many such tips in my earlier article, 10 tips to avoid NullPointerException and my reader liked that a lot. But, I wrote that article a couple of years ago when Java 8 was not around and there was no Optional, a new way to avoid NullPointerException in Java, but, things have changed now. Read more » By javin paul at October 19, 2021 10 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: best practices , core java , Java 8 TOP 5 COURSES TO LEARN DYNAMIC PROGRAMMING FOR CODING INTERVIEWS IN 2021 - BEST OF LOT Hello guys, If you are looking for a job and giving interviews then you might have noticed that getting a Software development Job is becoming more and more difficult every day. For example, there was a time when you can get a Java developer position by just knowing Core Java concepts like String, Collections, and Multithreading, etc, but, not anymore. There were definitely some questions on Data structure and Algorithms and even on Dynamic Programming at that time as well, but the focus was always on programming language expertise like Java or Python. But, things have completely changed now, and the focus is more and more on the candidate's ability to solve coding problems. Read more » By javin paul at October 19, 2021 0 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: courses , data structure and algorithm , online resources MONDAY, OCTOBER 18, 2021 TOP 5 WEBSITES TO LEARN SQL ONLINE FOR FREE - BEST OF LOT SQL is one of the most important skills for any programmer be it a Java, C++, Python, JavaScript, or Ruby developer. Almost 95% of the Java applications use a relational database in their back-end and almost all web applications use the database. In recent years, one of the most common ways to learn any programming skill is online, at your comfort of the office or home and SQL is no different. Learning SQL online has another advantage of a quick head start because you don't need to install a database and create tables to write some SELECT queries. The installation and setup are definitely a tough part for beginners and I have gone through that pain every time I have to learn a new database. Read more » By javin paul at October 18, 2021 10 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: best of javarevisited , database , online resources , SQL TOP 10 JAVA AND WEB DEVELOPMENT COURSES FROM UDEMY IN 2021 - BEST OF LOT Hello guys, I am sure you all have made your goals and resolutions for this year, like what to learn in 2021. If you haven't, then check out my post 10 Things Java programmers should learn in 2021 for some ideas. If you have already made your goal, then it is time to think about how you are going to achieve them. For example, my top 5 goals in 2021 are to learn Java 15, AWS, Microservices, Spring 5, and Spring Security 5, but how am I going to learn them? Well, I like books and online courses, and that's why I have been searching for some excellent courses on Java, Spring Boot, Microservices, Docker, Web development, and Spring. Read more » By javin paul at October 18, 2021 9 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: courses , java , online resources , programmers , spring JAVA 8 DATE TIME - 20 EXAMPLES OF LOCALDATE, LOCALTIME, LOCALDATETIME Along with lambda expressions, streams, and several minor goodies, Java 8 has also introduced brand new Date and Time API, and in this tutorial, we will learn how to use Java 8 Date Time API with simple how-to-do task examples. Java's handling of Date, Calendar, and Time is long been criticized by the community, which is not helped by Java's decision of making java.util.Date mutable and SimpleDateFormat not thread-safe. It seems, Java has realized a need for better Date and time support, which is good for a community which already used to of Joda Date and Time API. Read more » By javin paul at October 18, 2021 9 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: date and time tutorial , Java 8 HOW GARBAGE COLLECTION WORKS IN JAVA I have read many articles on Garbage Collection in Java, some of them are too complex to understand and some of them don’t contain enough information required to understand garbage collection in Java. Then I decided to write my own experience as an article. You can call it a tutorial about garbage collection in simple words, which would be easy to understand and have sufficient information to understand how garbage collection works in Java. Garbage collection works by employing several GC algorithms like Mark and Sweep, G1, etc. There are different kinds of garbage collectors available in Java to collect different areas of heap memory like you have serial, parallel, and concurrent garbage collectors in Java. Read more » By javin paul at October 18, 2021 88 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: core java , garbage collection , JVM Internals DIFFERENCE BETWEEN STACK AND QUEUE DATA STRUCTURE IN JAVA? EXAMPLE Stack and Queue are two of the important data structures in the programming world and have a variety of usage. As opposed to the array and linked list, which are considered primary data structures, they are secondary data structures that can build using an array or linked list. You can use Stack to solve recursive problems and Queue can be used for ordered processing. The difference between Stack and Queue Data structure is also one of the common questions not only in Java interviews but also in C, C++, and other programming job interviews. Read more » By javin paul at October 18, 2021 1 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: core java interview question , data structure and algorithm , java collection tutorial TOP 7 ONLINE COURSES TO LEARN BLOCKCHAIN, ETHEREUM, AND SOLIDITY FOR BEGINNERS IN 2021 - BEST OF LOT Hello guys, if you are not living under the rock, you would have definitely heard about Blockchain and Cryptocurrencies. Blockchain is one of the most in-demand skills, and there are not many people out there. If you want to learn Blockchain and related technologies like Etherium, Solidity, Hyperledger, etc., and are looking for Blockchain training courses and certification, you have come to the right place. But, before that, let get a quick overview of what Blockchain is and why it's popular, and why you should learn Blockchain in 2021. Read more » By javin paul at October 18, 2021 0 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: Blockchain , courses , online resources 10 EXAMPLES OF CONVERTING A LIST TO MAP IN JAVA 8 Hello guys, suppose you have a list of objects, List and you want to convert that to a Map, where a key is obtained from the object and value is the object itself, how do you do it by using Java 8 stream and lambda expression? Prior to Java 8, you can do this by iterating through the List and populating the map by keys and values. Since it's an iterative approach and if you are looking for a functional solution then you need to use the stream and lambda expression, along with some utility classes like Collectors, which provides several useful methods to convert Stream to List, Set, or Map. Read more » By javin paul at October 18, 2021 7 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: core java , Java 8 , Stream API examples DIFFERENCE BETWEEN FIRST AND SECOND LEVEL CACHE IN HIBERNATE [ANSWER] If you have used Hibernate in past then you know that one of the strongest points of the Hibernate framework is caching, which can drastically improve the performance of the Java application's persistence layer if configured and used correctly. Hibernate provides caching at many levels e.g. first level cache at Session level, second-level cache at the SessionFactory level, and query cache to cache frequently executed SQL queries. The first level cache minimizes database access for the same object. For example, if you call the get() method to access Employee object with id = 1 from one session, it will go to the database and load the object into memory, but it will also cache the object in the first-level cache. Read more » By javin paul at October 18, 2021 4 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: hibernate , hibernate interview questions SUNDAY, OCTOBER 17, 2021 TOP 5 COURSES TO LEARN WEB SECURITY IN 2021 - BEST OF LOT Hello guys, if you want to learn Web Security and want to become a Security expert and looking for the best online courses to learn Web Security then you have come to the right place. Earlier, I have shared the best Cyber Security Courses, Penetration testing courses, and best Kali Linux courses, and in this article, I Am going to share the best courses to learn Web Security. If you don't know Security experts are one of the highest paying jobs in Technology and there is a huge demand for people who understand Security and protect against cyber attacks, and that's where these best web security courses will help you. Read more » By javin paul at October 17, 2021 0 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: courses , Cyber Security , security TOP 5 COURSES TO LEARN RESTFUL WEB SERVICES IN JAVA WITH SPRING FOR EXPERIENCED DEVELOPERS IN 2021 In the last article, I have shared some courses to learn Microservice development with the Spring framework, and today, I'll talk about RESTful web service developments. The REST API and RESTful Web Services need no introduction, it's everywhere now and driving a new internet revolution. Most of the software development in the webspace now also involves REST APIs. Gone are the days where the only interface for a web application was the browser, now most of them support REST APIs, which allows them to be accessible on any device like mobile devices, tablets, apple watch, and any other digital gadgets. It doesn't matter whether you are working for software giants like Amazon, Facebook, or Google or working with startups like Uber or Netflix, REST APIs are everywhere. Read more » By javin paul at October 17, 2021 3 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: courses , online resources , REST HOW TO IMPLEMENT STACK DATA STRUCTURE IN JAVA? EXAMPLE TUTORIAL The stack is one of the popular data structures which supports LIFO (Last In First OUT) operation. Due to the LIFO advantage, you can use a stack data structure to convert a recursive algorithm to an iterative one. The stack data structure is very easy to implement using an array or linked list, but you don't have to implement it on your own because Java already provides a Stack implementation in java.util.Stack class. This class is a subclass of the Vector class and you should use it whenever you need Stack for your production code, there is no point in inventing the wheel again when the focus is on developing your application. Read more » By javin paul at October 17, 2021 3 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: Coding Interview Question , core java , data structure and algorithm TOP 10 ADVANCED SPRING FRAMEWORK COURSES FOR EXPERIENCED JAVA DEVELOPERS IN 2021 - BEST OF LOT Hello guys, if you are a Java developer and want to learn Spring Framework in-depth and looking for some advanced Spring online courses to learn things like Spring Boot, Spring Cloud, Spring Data JPA, Spring Security, Spring MVC, etc then you have come to the right place. Earlier, I have shared the best courses to learn Spring Boot, Microservices, and Hibernate and JPA and in this article, I am going to share the best and advanced Spring Framework courses for experienced Java developers. There is no doubt that the Spring framework is probably the most important skill for Java developers, but just knowing Spring is also not enough. Read more » By javin paul at October 17, 2021 0 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: courses , spring , spring boot SATURDAY, OCTOBER 16, 2021 TOP 10 FREE CODECADEMY COURSES FOR BEGINNERS TO LEARN PROGRAMMING IN 2021 - BEST OF LOT Hello folks, if you are looking for best free Codecademy courses to learn programming by yourself then you have come to the right place. In the past, I have shared free online courses from Udemy, Coursera, Pluralsight, Educative, and other websites and in this article, I am going to share best free Codecademy courses to learn Programming with Java, Kotlin, JavaScript, PHP, R, HTML, CSS, and many other useful programming languages. All these courses are tried and tested by thousands of developers and they are available for FREE on Codecademy. They are not only interactive but also updated regularly to teach you latest best practices and updated information. Read more » By javin paul at October 16, 2021 0 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: Codecademy , courses , free resources TOP 5 COURSES TO LEARN NUMPY FOR PYTHON AND MACHINE LEARNING DEVELOPERS IN 2021 - BEST OF LOT Hello guys, if you are learning Python or Data Science and want to learn NumPy library and looking for the best resources then you have come to the right place. EArlier, I have shared the best Python courses as well as the best courses to learn Data Science and in this article, I am going to share best courses to learn NumPy library, one of the most popular Python libraries for numerical calculation. If you don't know, Python is almost the popular programming language and has dominated every business sector from web development to making artificial intelligent models and IoT devices and is considered the most-loved language among data scientists and analyzers. Read more » By javin paul at October 16, 2021 0 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: courses , Data Science , machine learning , NumPy , python FRIDAY, OCTOBER 15, 2021 TOP 5 COURSES TO LEARN TWITTER FOR MARKETING AND SALES IN 2021 - BEST OF LOT Hello guys, if you are a blogger, content creator, coach, influencer, digital marker, or online course creator, you may know that you can use Twitter for marketing and sales in 2021. Twitter is one of the best social platforms for marketing and selling eBooks, courses, classes, and anything, including physical products. While the platform is excellent, it's not easy to master and use Twitter effectively, and that's where these resources and online courses help you. I have created this list based upon my own experience as a blogger, author, and course creator, and I have also shared how Twitter helped me sell more of my books. Read more » By javin paul at October 15, 2021 0 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: courses , digital marketing , general , Twitter 130+ JAVA INTERVIEW QUESTIONS ANSWERS FOR 2 TO 7 YEAR EXPERIENCED PROGRAMMERS Time is changing and so is Java interviews. Gone are the days, when knowing the difference between String and StringBuffer can help you to go through the second round of interview, questions are becoming more advanced and interviewers are asking more deep questions. When I started my career, questions like Vector vs Array and HashMap vs Hashtable were the most popular ones and just memorizing them gives you a good chance to do well in interviews, but not anymore. Nowadays, you will get questions from the areas where not many Java programmer looks e.g. NIO, patterns, sophisticated unit testing or those which are hard to master e.g. concurrency, algorithms, data structures and coding. Read more » By javin paul at October 15, 2021 42 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: core java interview question , interview questions , java interview questions TOP 5 COURSES TO CRACK COMPTIA PENTEST+ CERTIFICATION EXAM IN 2021 - BEST OF LOT Hello guys, If you are preparing for the CompTIA PenTest+ exam and looking for the best online courses and practice tests to boost your preparation, then you have come to the right place. In the past, I have shared the best online courses to pass CompTIA certifications like CompTIA IT Fundamentals, CompTIA Server+, CompTIA A+, Cloud+, and Security+. In this article, I will share the best courses, practice tests, and exams simulators to prepare for the prestigious Pentest+ certification. If you want to become Pen Tester, then this is the exam you should target. Read more » By javin paul at October 15, 2021 0 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: CompTIA Certifications , courses , Cyber Security , IT Certifications TOP 15 TENSORFLOW INTERVIEW QUESTIONS AND ANSWERS FOR 1 TO 2 YEARS EXPERIENCED Hello guys, if you are preparing for Machine Learning Engineer interviews or a Data Science Interview and looking for popular TensorFlow interview Questions then you have come to the right place. Earlier, I have shared the best courses to learn TensorFlow and Machine Learning and in this article, we are going to share the frequently asked TensorFlow questions for Interviews. These questions cover key TensorFlow concepts and you can use them to revise TensorFlow before your interview. They are good for both screening and Telephonic rounds of interviews. Read more » By javin paul at October 15, 2021 0 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: interview questions , machine learning , Tensorflow THURSDAY, OCTOBER 14, 2021 TOP 5 COURSES TO LEARN KALI LINUX IN 2021 - BEST OF LOT Kali Linux is an open-source Debian system based on Linux developed by the offensive security company for ethical hackers. It contains more than 400 tools categorized to make it easy for security researchers to analyze your network, test the system security, discover different vulnerabilities inside a web application, hide malware in apps, and target Android phones. If you want to learn Kali Linux and looking for the best online courses to learn Kali Linux on your own then you have come to the right place. Earlier, I have shared the best Ethical Hacking courses and Cyber Security Courses, and in his article, I am going to share the best Kali Linux courses for beginners. Read more » By javin paul at October 14, 2021 0 comments Email This BlogThis! Share to Twitter Share to Facebook Labels: courses , Cyber Security , Kali Linux , linux Page 1 of 2491234567...249Next »Last Subscribe to: Posts ( Atom ) SUBSCRIBE FOR DISCOUNTS AND UPDATES Follow SEARCH THIS BLOG INTERVIEW QUESTIONS * core java interview question (174) * data structure and algorithm (75) * Coding Interview Question (74) * interview questions (70) * design patterns (35) * SQL Interview Questions (34) * object oriented programming (34) * thread interview questions (30) * spring interview questions (28) * collections interview questions (25) * database interview questions (16) * servlet interview questions (15) * Programming interview question (6) * hibernate interview questions (6) BEST OF JAVAREVISITED * How Spring MVC works internally? * How to design a vending machine in Java? * How HashMap works in Java? * Why String is Immutable in Java? * 10 Articles Every Programmer Must Read * How to convert lambda expression to method reference in Java 8? * 10 Tips to improve Programming Skill * 10 OOP design principles programmer should know * How Synchronization works in Java? * 10 tips to work fast in Linux * 5 Books to improve Coding Skills JAVA TUTORIALS * date and time tutorial (24) * FIX protocol tutorial (15) * Java Certification OCPJP SCJP (31) * java collection tutorial (77) * java IO tutorial (29) * Java JSON tutorial (12) * Java multithreading Tutorials (59) * Java Programming Tutorials (19) * Java xml tutorial (16) * JDBC (34) * jsp-servlet (37) * online resources (217) GET NEW BLOG POSTS ON YOUR EMAIL GET NEW POSTS BY EMAIL: Subscribe FOLLOWERS 1. 2. 3. 4. 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