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Thursday, May 30, 2024

How to sort a HashMap in Java 8 by keys and values using Stream and Lambda Expressions

Technically, you cannot sort a HashMap in Java because it doesn't guarantee any order. So, even if you add entries in sorted order they will be placed randomly and you won't be able to iterate over map in sorted order of keys or values. Though, if you want to process keys, values or entries of an HashMap in sorted order, you can get the data from the HashMap and then potentially use a TreeMap (when you want to sort a HashMap by key) or LinkedHashMap (when you want to sort a HashMap by value) to store entries in sorted order. This is also the way, we used to sort HashMap before Java 8. 

Wednesday, May 29, 2024

3 ways to Find First Non Repeated Character in a String - Java Programming Problem Example

Write a Java program to find the first non-repeated character in a String is a common question on coding tests. Since String is a popular topic in various programming interviews, It's better to prepare well with some well-known questions like reversing String using recursion, or checking if a String is a palindrome or not. This question is also in the same league. Before jumping into the solution, let's first understand this question. You need to write a function, which will accept a String and return first non-repeated character, for example in the world "hello", except 'l' all are non-repeated, but 'h' is the first non-repeated character.

Tuesday, May 28, 2024

Can you take Spring Professional Certification without Training Course? [Yes]

Hello guys, I have a big news to share with you now. Since 5th April 2024, you can take Spring certification without any mandatory training or Spring Pro content. So after a flip flop of making training mandatory, Spring certification is free again. Vmware, the company behind Spring, after acquiring Pivotal has reversed the earlier decision announced on 10th May 2017 by Pivotal, the previous owner of Spring Framework, that "Spring Certification Exams are now available for individual purchase, without enrolling in the course". This was one of the most discouraging changes in the Spring certification program since it's launched 10 years back. The cost of Spring certification was the single, biggest obstacle for many experienced Java and Spring developers to get certified for their Spring framework skills.

Top 25 Apache Kafka Interview Questions Answers for Java Developers

Hello, guys if you are preparing for the Java Developer or Apache Kafka interview and looking for frequently asked Apache Kafka interview questions and answers then you have come to the right place. Earlier, I have shared the best Kafka courses and popular interview questions on JavaJMSSpring Boot, and Hibernate and in this article, I Am going to share 20 frequently asked Apache Kafka interview questions with answers. Over the years, Kafka which is developed by Apache Software Foundation has gained popularity because of its immense capability of data processing and become a standard tool for high-speed and reliable messaging. 

Review - Is Grokking the System Design interview Course on DesignGuru Worth it?

Hello guys,  we are here again today for another exciting topic to discuss. But today, we will not discuss something related to Java or any other language or spring boot. Today, we will discuss something that is immensely practical and has the potential to land you very high-paying jobs. Today we are going to review a course that focuses on System Design! System Design is crucial for coding interviews! And it's also one of the most challenging topics to master. I have shared the best System design courses for coding interviews and books in the past. Today, I will review one of the top system design courses for technical discussions, Grokking the System Design Interview by Design Gurus.

Monday, May 27, 2024

Top 30 Programming questions asked in Interview - Java C C++ Answers

Programming questions are an integral part of any Java or C++ programmer or software analyst interview. No matter which language you have the expertise it’s expected that you are familiar with the fundamentals of programming and can solve problems without taking the help of API. Programming questions like reversing String using recursion or how to find if Array contains duplicates are some popular examples of programming question in Java. Programming questions present a lot of challenges Especially to Java developers as compared to C++ programmer and I think, One reason for this is powerful Java API; Which has a method for almost every need and you rarely need to write by your own or there are lots of third-party library from Apache, Spring, Google and other open sources.

Review - Is ByteByteGo System Design Interview Course by Alex Xu Really Worth it in 2024?

Hello guys, if you are preparing for System Design Interview in 2024 then you may have most likely come across names like ByteByteGo, Alex Xu or System Design Interview - An Insider Guide by Alex Xu, and if you are wondering what they are or you know about them but thinking whether ByteByteGo is worth it or not? then you have come to the right place. Yes, ByteByteGo is indeed worth considering for your System Design Interview preparation. because its created by Alex Xu, an expert with FAANG interview experience, the platform offers in-depth coverage of system design topics. The author's use of diagrams to explain concepts in detail enhances the learning experience. 

Saturday, May 25, 2024

12 Intermediate Database Administrator and Developer Interview Questions on Indexing

A good understanding of Index is very important for any programmer working with database and SQL. It doesn't matter whether you are working as DBA or Application developer, working in Oracle, MySQL, or Microsoft SQL Server or any other database, you must have good understanding of how index works in general. You should know different types of index and their pros and cons, how your database or Query engine chooses indexes and the impact of table scan, index scan, and index seek. You should also be able to build upon your knowledge to optimize your SQL queries as well as troubleshoot a production issue involving long running queries or poor performing queries. This is also a great skill for experience developers with 5 to 6 years of experience under his belt. 

How to Manage Distributed Transaction in Microservices? SAGA and 2 Phase Commit Example Tutorial

Hello guys, managing transaction in a distributed system like Microservices is very challenging and if you don't have a proper approach then you may face production issues and end of with data lose, data corruption and app failure. That's why managing distributed transaction is also an important topic on Microservice interviews. If you are working in Microservices architecture then you may have already heard about the SAGA and 2 Phase Commit etc. and there is also a chance that you may have been asked about those on Java developer interviews. If not, don't worry, in this article, I will tell you about those Microservices design patterns while showing how to manage distributed transactions in Microservices architectures in Java.  

Top 10 Websites to Learn System Design and Software Design in 2024 - Best of Lot

Hello guys, if you are preparing for System design Interview and looking for best resources to master Software design and System design then you have come to the right place. Earlier, I have shred best System Courses, Books, System Design Interview Guide, Cheat Sheets, and System Interview Questions and in this article, I am going to share best places to learn System design in 2024. Before we get to the best websites that will teach you everything you need to know about system design, let me tell you a little bit about what it really is. Systems design is basically the process of defining elements of a system including modules, architecture, components, interface, and data for a system based on a specific set of requirements. It can also refer to the process of defining, developing, and designing systems. These designs have to satisfy the specific needs of a company or an organization.

Friday, May 24, 2024

Top 10 Courses to Learn JavaScript in 2024 - 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.

Top 10 System Design and Software Analysis and Design Books in 2024 - Best of Lot

Hello guys, System design and Software design are two important topic for coding interviews and also two important skill for Software developers. Without knowing how to design System you cannot create new software and it will also be difficult to learn and understand existing software and system. That's why big technical companies like FAANG pays special attention to System design skill and test candidates thoroughly. If you want to learn System design and looking for best resources like best System design books and courses then you have come to the right place. Earlier, I have shared best System design online courses, as well as Software architecture courses,  and common System design questions and in this article, I am going to share with you best System design books to learn Software design. 

Top 10 Websites and Online Platforms to Learn Git for FREE in 2024 - Best of Lot

Hello guys, like many programmers, I have also worked with a lot of source control systems like SVN, CVS, TFS, VSS, Mercury, and I had always wondered why so many source control systems? Why not just one. It's one of the necessary software tools for development, and everyone needs a version control and code repository, there should be a standard solution. It seems Git and Github have solved that problem now. Now, Git is everywhere from open source to closed source, from small startups to big Investment banks, but there were still legacy projects which were lying on SVN and CVS, but they are now also started moving towards it.

Wednesday, May 22, 2024

Top 8 Online Courses to Learn Docker and Kubernetes in 2024 - Best of Lot [UPDATED]

Hello guys, how are you doing? Are you on track to accomplish your goals this year? I am sure you had made goals when this year was started, but if not, you can still check out 10 Things Java developers can learn in 2024. It's never too late. From my experience with interacting with many software developers, it seems DevOps, Docker, Kubernetes and Cloud Computing is the top priority for many programmers this year, especially senior Java developers. I have been receiving a lot of queries, emails, and chats about how to learn Docker and Kubernetes, two of the most popular DevOps tools. When it comes to learning, nothing beats personal training, but that's not always feasible; hence we need to rely on self-learning using books and online courses, and that's what I will suggest to you in this article.

How to Crack Java Programming Interviews in 2024? Topics, Courses, Books, and Questions

Java Interviews are a little bit different than traditional programming interviews on tech giants and product-based companies like Google, Amazon, Microsoft, or Facebook. First, even though it has questions from Data Structures and Algorithms like String or Array, you can still manage to clear Java interviews if you are not an expert on them. The questions are a little bit easier and more practical than those companies. Another essential thing about Java interviews are questions based upon Java programming language and JDK API. Since Java is also an Object-oriented programming language, you will find lots of OOP questions there.