How to use filter + map + collect + Stream in Java? Example Tutorial

Hello guys, many of my readers emailed me to write a post about the map and filter function of Java 8 because they found it difficult to understand and use. Even though I have previously blogged about both map() and filter(), I am writing this post again to explain the concept in more layman's language for a better understanding of my readers and fellow Java developers. The map() function is a method in Stream class that represents a functional programming concept. In simple words, the map() is used to transform one object into another by applying a function. That's the reason the Stream.map(Function mapper) takes a function as an argument. For example, by using map() function, you can convert a list of String into List of Integer by applying Integer.valueOf() method to each String on the input list.

Top 5 Courses to Learn Eclipse IDE for Java Programmers in 2024 - Best of Lot

Hello guys, If you are in Java development, you may know that Eclipse is one of the most popular IDEs for Java development and millions of Java developers used it worldwide. Since IDEs like Eclipse, NetBeans, and IntelliJIDEA are an integral part of a Java developer's life, it makes sense to spend some time learning your IDE like Eclipse and get productive with it. This will not only save a lot of your time during development, testing, and debugging, but it will also make you a better developer. It's said that a craftsman is as good as their tools, and it's true for a programmer also. In general, expert developers have better tools, and they know their tools better, which often differentiates them from average programmers.

Top 5 Courses to become Full stack Java Developer in 2024 - Best of Lot

Hello guys, If you want to become a full-stack Java developer in 2024 but are not sure what path you should take and how to get there, then you have come to the right place. In this article, I'll share some online training courses you can choose to become a full-stack Java developer. The demand for a full-stack Java developer is very high because Java is the #1 programming language for backend and server-side development. Frameworks like Spring Boot and Spring Cloud are also leading the Microservice architecture development, which is better suited for deployment in Cloud platforms like AWS, Azure, and Google Cloud Platform.

Top 5 Google Cloud Platform (GCP) Courses and Certifications to Learn Online in 2024 - Best of Lot

The GCP or Google Cloud Platform is a slightly late entrant in the world of public cloud computing but it has completely changed the public cloud landscape in the last few years, particularly the monopoly of AWS on Cloud has been challenged. It's still neither the most popular public cloud platform like Amazon Web Services, nor the darling of the corporate world like Microsoft Azure but its Performance, Tools, and innovation of Google is attracting more and more companies to Google Cloud Platform, particularly in the areas of Big Data and Machine Learning. With tools like Bigtable, BigQuery, and libraries like TensorFlow, Google Cloud Platform is quickly becoming the go-to platform for Machine learning innovations. Because of all these, there is an increased demand for Cloud experts who are familiar with GCP and Google Cloud Platform concepts and tools.

Top 7 Websites to learn Cloud Computing with AWS Online for FREE in 2024 - Best of Lot

Hello guys, if you want to learn AWS and looking for the best websites to platforms for AWS learning material then you have come to the right place. Earlier, I have shared the best AWS courses and guides to pass various AWS certifications and today, I Am going to share the best platforms to learn AWS online. Amazon AWS is a bunch of services offered from Amazon on the cloud to help you empower your business and your web application by offering some services to develop and deploy your application such as EC2 service as well as storing the data in this databases such as S3 service and you can handle the whole infrastructure of your app in one dashboard which is the AWS CloudFormation service and many more just to name a few.

How to Prepare for Google Cloud Data Engineer Exam in 2024?

Hello guys, if you are preparing for Google Cloud Data Engineer exam in 2024 but don't know how to approach this exam so that you can pass in very first attempt then you have come to the right place. Earlier, I have shared many resources for Google Cloud Data Engineer exam like these best Google Cloud Data Engineer courses and Practice tests and today, I am going to share the complete, step-by-step guide to prepare Google Cloud Data Engineer certification. The guide not only list down which topics to prepare, weightage of different topics but also many exam resources like white papers and case studies. In the wake of being affirmed as Google Cloud Professional Architect, I needed to proceed with the force and overcome upon "Google Cloud Certified — Professional Data Engineer" certificate too. It took me approximately 1.5 months (alongside my everyday work) practically to plan for the cert and to feel certain before trying it out.

Top 5 Golang Courses to Learn Go Programming Language in 2024 - Best of Lot

Hello guys, if you want to learn the Go programming language, also known as Golang in 2024 and looking for the best Golang resources like Golang online courses, books, and tutorials, you have come to the right place. Earlier, I have shared the best courses to learn Scala, Kotlin, and Rust programming language, and today, I will share with you the best online courses to learn Golang programming language. Designed by Google, Golang (also called Go) is an open-source, statically typed, and compiled programming language. It's one of the hottest new programming languages and there is a lot of demand for Golang developers in the software development market hence learning Golang in 2024 can add a valuable skill to your resume.

Top 50 SQL and Database Phone Interview Questions Answers

Database and SQL is a very important skill, not just for DBA or Database admins but also for any application developer like Java, .NET, or Web developers. This is why you would often see questions from SQL and Database in Programming interviews. For DBAs, SQL is more important than a programmer, because it being their primary skill, they are also expected to know more than a common Java or .NET developer. Since no Java interview is just about Java questions, many times I receive a request from my reader about SQL questions like how to solve a particular query or some tricky questions based upon database indexes.

Top 5 Java Foundations Exam [1Z0-811] Courses and Practice Tests in 2024 - Best of Lot

Hello guys, if you are preparing for the Java Foundations certification exam with code 1Z0-811 and looking for the best preparation material like books, online courses, and tutorials then you have come to the right place. In the past, I have shared the best Java courses and best Java books for beginners and in this article, I am going to share the best online courses and practice tests you can join to prepare for Java Foundations Exam in 2024. But, before I tell you about the best courses and the practice tests that you can use to boost your chances in Java Foundations, let me tell you what exactly it is as many Java developers and people starting with Java are not familiar with this exam.

How to use Environment Variables in Spring Boot's application.properties file? Example Tutorial

How to use environment variable in Spring boot's application.properties is a major problem when your spring boot application running on different places like local, Jenkins, and OpenShift. So we need to make the data source file dynamic in the application.properties file. So let's have look at how to do this at how to use the env variable in Spring Boot's application.properties. So in this tutorial, We assume that you have knowledge of Spring boot and not going to talk about small details. 

Top 5 Free Golang Courses to Learn Go Programming for Beginners in 2024 - Best of Lot

Hello guys, if you want to learn the Go programming language or Golang programming language, one of the darling language of emerging tech companies like Byte Dance (the company behind TikTok) and one that has come from Google and looking for the best resources like books, tutorials, and online courses then you have come to the right place. Earlier, I have shared the best Golang courses from Udemy, Pluralsight, and Coursera but a lot of you asked for free online courses to learn Golang so that you can start learning this in-demand programming language without any cost barrier. I heard that and I looked for the best free courses I can find on the internet to learn Golang and this article is the result of that. 

Top 5 Courses for AWS Certified Machine Learning Specialty exam (MLS-C01) Exam in 2024 - Best of Lot

First things first. What exactly is the AWS Machine Learning Specialty?  It is a certification that helps organizations and businesses identify and develop talent with critical skills for implementing cloud initiatives. If you clear the AWS Certified Machine Learning Specialty exam, it means that you are an expert in building, training, tuning, and deploying machine learning models on AWS. The AWS Certified Machine Learning Specialty exam is meant for individuals who perform a development or data science role and have more than one year of experience developing, architecting, or running machine learning workloads, in the AWS cloud. 

Top 5 Courses to learn Elasticsearch, Kibana, and Logstash in 2024 - Best of Lot

If you are someone who is running an application or planning to run an application that has a complex search/store functionality and is mainly based on the text? You are surely on the right page! Let's understand what Elasticsearch is. Elasticsearch is an open-source full-text search and analytics engine that is extremely scalable. It enables you to swiftly store, explore, and analyze large amounts of data in near real-time.  It's typically employed as the underpinning engine/technology for applications with advanced search functionality and needs.

Top 5 Data Engineering and Cloud Certifications From IBM on Coursera in 2024 - Best of Lot

Suppose you are just a beginner searching to learn new things in the IT industry and tend to become a developer, a data scientist, a cybersecurity specialist, or already in that position. Still, you want to advance your skills in that domain. Then there is no better place to learn than the Coursera platform. Big companies and universities create courses and offer them to people for free access. Still, you need to pay to get the certification. One of the best courses in the platform is provided by the IBM company for people who work in the IT industry and apply them in real-life scenarios.

How to Create a thread-safe ConcurrentHashSet in Java 8? [Example]

Until JDK 8, there was no way to create a large, thread-safe, ConcurrentHashSet in Java. The java.util.concurrent package doesn't even have a class called ConcurrentHashSet, but from JDK 8 onwards, you can use the newly added keySet(default value) and newKeySet() methods to create a ConcurrentHashSet backed by ConcurrentHashMap in Java. This is better than old tactical solutions like using a concurrent hash map with dummy value or using the set view of the map, where you cannot add new elements. The Set returned by keySet(defaultValue) and newKeySet() methods of JDK 8 is a proper set, where you can also add new elements along with performing other set operations like contains(), remove() etc.

Why use Cloud Computing? Advantages and Disadvantages

Hello guys, If you are curious about Cloud computing and why every company, both big and small, is going to be cloud-native, you have come to the right place. In the past, I have shared the best Cloud Computing courses and both free and paid courses to learn about popular cloud platforms like AWS, GCP, and Azure. In this article, I am going back to basics and telling you about what is cloud computing and what benefits it offers. Cloud Computing has been a buzzword in the IT world for the last few years. When it first appeared, like many things, a lot of people has dismissed it as being the next big thing, but cloud computing has certainly lived up to expectations and truly shifted how the Information technology arm of business functions today.

Top 5 Online Courses to Learn Deep Learning in 2024 - Best of Lot

Learning Deep learning in-depth? Sounds recursive? No? It is, indeed. There is no doubt that Machine Learning is a tough subject, and in-depth knowledge, in particular, requires a lot of maths and complex terminology and is very tough to master. How do you learn it better if the subject matter is that tough? Choose a course that can explain this complex topic in simple words. We are actually blessed that we have many excellent instructors like Andrew Ng, Jeremey Howard, and Kirill Eremenko on Udemy, who are not just experts in deep learning but also excellent instructors and teachers.

Top 6 Online Courses to learn Gatsby.js Framework in 2024 - Best of Lot

Hello guys, if you want to learn Gatsby and looking for the best online courses to learn Gatsby, then you have come to the right place. In the past, I have shared the best React courses, and best Angular Courses, and today, I will share the best Gatsby online courses for beginners. The Gatsby.js has become significantly popular in recent years. It is a react-based static site generator powered by GraphQL and is quite popular to develop static websites that don't require a traditional backend. Instead, these site uses APIs and CDN to deliver content to browser and mobile applications. 

How to prepare for AWS certified data analytics specialty Exam in 2024?

Amazon AWS's "AWS Certified Data Analytics – Specialty" certification is one of the most prestigious certifications in the field. Professionals in the area of data analytics now have official recognition in their resumes and job applications. To become an Amazon AWS Certified Solutions Architect, applicants must pass an exam administered by the company. An AWS credential certifies your ability to use Big Data ingestion, storage, and processing on AWS. AWS Certified Data Analytics - Specialty is expected for people with experience and mastery working with AWS administrations to configuration, fabricate, secure, and keep up with investigation arrangements.

Top 6 Courses to Learn AWS Lambda and Server less Framework in 2024 - Best of Lot

Hello guys, you might have heard about the Serverless architecture and AWS Lambda function as more and more software developers are talking about. AWS Lambda is an event-driven, serverless computing platform provided by Amazon as a part of Amazon Web Services. There is another serverless computing platform like Microsoft Azure that has Azure functions and GCP also has Cloud Functions. With Serverless frameworks like AWS Lambda or Azure Functions, a developer can write scalable, fault-tolerant code that runs in the cloud without provisioning or managing servers. I mean, you don't need to get an EC2 instance or a virtual machine to run your app. 

Top 5 Courses to learn Natural Language Processing (NLP) in 2024 - Best of Lot

Hello guys, if you want to learn Natural Language Processing or NLP in 2024 and looking for the best online courses to learn NLP then you have come to the right place. In the past, I have shared the best courses to learn data science, machine learning, computer vision, and deep learning, and today, I am going to share the best courses to learn Natural language processing, one of the most useful branches of machine learning. These online courses have been created by experts and thousands of developers have already joined this course to learn Natural Language Processing skills and advance in their careers. You can also do the same too. 

Top 5 Online Courses to learn CSS [Cascading Style Sheet] in Depth in 2024 - Best of Lot

Hello guys, if you are learning CSS or want to learn CSS and looking for the best online courses then you have come to the right place. Earlier, I have shared the best courses to learn HTML, JavaScript, Angular, React, and Nodejs, and today, I am going to share the best CSS Courses for beginners. These are the best online courses from sites like Udemy and Coursera which you can join to learn CSS, one of the essential skills to become a web designer and web developer. These courses have been created by experts like Maximilian Schwarzmüller, who have taught more than a million people web development. You can also join one of these top CSS courses to learn CSS from scratch in 2024.

Top 6 Courses to Learn Computer Science Fundamentals in 2024 - Best of Lot

Hello guys, if you want to learn Computer Science fundamentals and look for the best resources like online courses and books, you have come to the right place. Earlier, I have shared the best courses to learn data structure and algorithms and in this article, I am going to share the best courses to learn Computer Science fundamentals. These are the best online courses a beginner can join to learn Computer Science basics. They are created by experts and trusted by thousands of people who have already joined these courses in platforms like Udemy,, Coursera, and edX. You can also do the same and improve your knowledge of Computer Science fundamentals to boost your career. 

Top 5 Courses to Learn R Programming Language in 2024 - Best of Lot

Hello guys, if you are interested in Data Science, Machine Learning, and Statistics then you may have come across the R programming language, one of the best programming languages for those jobs. R is not just a programming language but a whole set of tools and environments created for working with statistical computing and graphics. If you want to learn R programming and looking for the best online training courses, classes, and tutorials then you have come to the right place. In the past, I have shared free courses to learn R and in this article, you will find the best R programming courses from Udemy, Coursera, and edX which you can join to learn R programming language for Data Science and Statistics. The list includes both free and paid courses. 

Top 5 Online Courses to Learn Statistics for Data Science and Deep Learning in 2024 - Best of Lot

One of the main challenges for programmers learning Data Science and Machine learning is the amount of Mathematics involved in it, particularly in deep learning and neural network training. When I first started exploring deep learning, Maths came as an obstacle. Even though I was an excellent Maths student in my college, I still lack behind in Statistics, Probability, and Calculus involved while learning Data Science, and that's why I decided to refresh my knowledge and re-learn Statistics and Maths for Data Science. We also live in a world of Big data, and someone needs to make sense of all this data, and that's a demand for Data scientists is growing, but it's not a natural field to jump in. Most of the Data scientists I have met hold a Ph.D. and really good at their Maths and Statistics skills.

Top 5 Unity Online Courses for Game Development in 2024 - Best of Lot

Hello guys, if you are thinking to learn Game development in 2024 then learning Unity can be a great choice. If you don't know, Unity is a powerful game engine that allows you to build both 2D and 3D games for PC, Mac, and Console. Many popular games of the last decade, like Temple Run Trilogy, Rust, Wasteland 2, Pokemon Go, and Angry Birds 2, were built using the Unity game engine. Unity is also a cross-platform game engine, which means you can create games for multiple platforms like Android, iOS, macOS, PC, Linux, and even popular gaming consoles like Xbox, among others. Unity Game engine also allows you to create both 2D and 3D games and provides several useful features to make your game truly amazing.

Udemy vs Coursera? Which is best to learn Programming & Tech skills in 2024?

When it comes to online learning, there are no better times than today, as you have access to many platforms like Coursera, Udemy, Pluralsight, Educative, Lynda, CodeCademy, and many more. Out of these, Coursera and Udemy are probably the most popular online learning websites, as more and more people have started using them. One question which keeps comings to me all the time is Coursera vs. Udemy? Which one is better for online learning and which has a better course in general? Earlier, I answered questions like Pluralsight vs. CodeCademy and Udemy vs. CodeCademy but never explained Udemy vs. Coursera, which many of my readers have been asking for some time. So, I decided to write this blog post to illustrate my point of view.

Top 5 Google Cloud Professional Architect Certification Courses & Practice Tests in 2024 [UPDATED]

Hello guys, if you are preparing for Google Cloud Architect Certification and looking for the best GCP Cloud Architect course, then you have come to the right place. I have shared about the GCP Cloud Engineer and Data Engineer Certification in the past, and today, I will share the best online courses for the GCP Cloud Architect Certification exam. If you want to enrich your CV or work with Google cloud platforms, but you're unable to decide which course is the right fit for you, then check out these great options. The list contains the best online training courses for the Google Cloud Certified Professional Cloud Architect exam from Udemy, Coursera, Whizlabs, and Pluralsight.

Top 5 Websites to Learn React.js for FREE in 2024 - Best of Lot

Hello guys, if you want to learn Reactjs in 2024 and are looking for the best websites to learn React, you have come to the right place. Earlier, I have shared the best React courses, books, and a complete React JS Developer RoadMap, and today, I am going to share the best websites to learn React for FREE. React.js is one of the most popular front-end development libraries, and it's used heavily by all kinds of companies. There is also a lot of demand for React.js developers as there are not many developers who understand React and create React components. I just looked at the Indeed React jobs, and more than 27K React.js jobs are available. I bet the actual number is a lot more than that, and that's why learning React.js can be a game-changer for your career. 

15 Best Free Coursera Courses for Beginners to learn Essential Tech Skills in 2024 - Best of Lot

Hello guys, if you are looking for free Coursera courses to learn new tech skills like cloud computing, AWS, Google Cloud, networking, programming, android app development, and Machine learning, you have come to the right place. Earlier, I have shared the best Coursera courses to learn Data Science, Software Development, Cloud Computing, and Web Development, and in this article, I am going to share the best free Coursera courses you can join to learn in-demand skills. The list contains both permanent free courses, I mean courses that have been free from the beginning, and some free courses for learners in India for a limited amount of time. 

Does Udemy, Coursera, edX, and Udacity Course Certifications Helps in Job & Career?

While online courses provide an excellent platform for learning at low cost, at your schedule, and at your own pace, I often received questions from my readers about the worth of their certifications. Many people asked me whether course completion certificates offered by Udemy, Coursera, edX, Educative, Udacity, or any such online platforms are worth any? The answer to this question is both Yes, and No because it totally depends upon what worth means for you?  If you are thinking that just completing a  Computer Science or Data Science course on Coursera and displaying a certificate on your resume or on LinkedIn will land you a job, then definitely, it's not worth it, but at the same time, these certifications can put your resume forward to many Recruiters looking for Data Scientist.