Thursday, October 21, 2021

Top 5 Online Courses To Learn Computer Security in 2021 - Best of Lot

Computer security is a complex field of learning but must for everybody learn to protect themselves and their companies from letting bad people access your sensitive information they shouldn’t access. We always hear in the newspaper how evil people harm companies and people and make the world lose billions of dollars every year. It looks like bad people are winning the battle against giant companies and beginner people in security. Still, you can change that by taking some courses that will teach you at least the basics of computer and network security and how these guys can access your computer and information using many techniques such as social engineering and stopping them.

Top 21 Tech Skills Java Developers Can Learn in 2021

Hello guys, recently I was doing some research on what skills Java developers should learn in 2021 to become a better developer and give their career a boost and I found some interesting skills like Kafka and  Elastic Search, apart from obvious ones like Spring Boot and Microservices. One of my favorite places for doing such research is examining Job listings on LinkedIn from different companies like Investment banks, Service-based companies, startups, and mid-tier companies where Java is used extensively. When I saw those skills, I can immediately tell that those are really useful and worth sharing with you guys, as I have often seen those skills playing important roles while hiring Java developers.

Top 5 React and Redux Courses to Learn Online in 2021 - Best of Lot

If you are a Web developer or someone passionate about web development and looking for some awesome courses to learn React or React JS, a popular JavaScript framework to develop a component-based user interface then you have come to the right place. Facebook's React library has taken the front-end development world by storm. More and more people have started using React even in favor of Google's Angular, another popular front-end development framework. Well, I am not going into the classic debate of Angular vs React as both the framework has their own advantage and disadvantage but if you have chosen to learn React, you have made the right decision.

Wednesday, October 20, 2021

Top 10 Udemy Courses for Python and JavaScript Programmers in 2021 - Best of Lot

Hello guys, Udemy, one of the most popular online learning platforms, is known for its sale where you can buy a $200 course for just $10, and they are rerunning a deal. It's actually an excellent time to buy some quality courses as you won't get another chance to buy the course at a price as low as $9.9, but the big question is which courses you should buy on Udemy in 2021? I always purchase courses from the reputed instructor and teach evergreen and in-demand skills like Java, Python, Microservices, Docker, Kubernetes, and AWS. I generally buy a lot of courses in Udemy sales and then access them whenever I need them. Though, I must warn you Udemy is addictive, and I often buy more classes than I need, so beware of that and buy courses you need now or shortly.  

Difference between CAST, CONVERT, and PARSE function in Microsoft SQL Server

Though all three, CAST, CONVERT, and PARSE are used to convert one data type into another in SQL Server, there are some subtle differences between them. The  CAST method accepts just two parameters, expression, and target type, but CONVERT() also takes a third parameter representing the format of conversion, which is supported for some conversions, like between character strings and date-time values. For example, CONVERT(DATE, '2/7/2015', 101) converts the character string '2/7/2015' to DATE using DATE format 101, representing United States standard.

Top 5 Courses to Learn Scikit-Learn Library in 2021 - Best of Lot

Hello folks, if you want ot learn Scikit-Learn library and looking for the best resources like online courses and classes 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 the best courses to learn Scikit-Learn library, one of the most popular Python libraries for Machine Learning along with TensorFlow, Keras, and Pytorch. Scikit-learn provides a selection of efficient tools for machine learning and statistical modeling including classification, regression, clustering, and dimensionality reduction via a consistent interface in Python and it is one of the essential skills for professional Data scientists and Machine Learning engineers. 

Difference between Abstraction and Encapsulation in Java? OOP Question Answer

Both Abstraction and Encapsulation are two of the four basic OOP concepts which allow you to model real-world things into objects so that you can implement them in your program and code. Many beginners get confused between Abstraction and Encapsulation because they both look very similar. If you ask someone what is Abstraction, he will tell that it's an OOP concept which focuses on relevant information by hiding unnecessary detail, and when you ask about Encapsulation, many will tell that it's another OOP concept which hides data from the outside world. The definitions are not wrong as both Abstraction and Encapsulation do hide something, but the key difference is on intent.

Recursive Binary Search Algorithm in Java - Example Tutorial

The binary search algorithm is one of the most famous search algorithms in computer science. It allows you to search a value in logarithmic time i.e. O(logN), which makes it ideal to search a number on a huge list. For example, in order to search a number in a list of 1 million numbers will take around 210 comparisons compared to 1 million comparisons required by the linear search algorithm. The only thing is that the list must be sorted before you can use a binary search algorithm and it must support index-based search. That's why binary search is often implemented using an array because doing a binary search with a linked list will not be fast because it doesn't provide index-based access i.e. O(1) access. You have to traverse to that element to read its value in the linked list which is O(n), effectively reducing the performance of binary search to a sequential search algorithm.

Top 5 Courses to learn JVM Internals, Memory Management, GC and Performance Tuning in Java in 2021

For a senior Java developer, it's essential to know how JVM works and how to troubleshoot issues with respect to memory, most notably memory leaks in Java applications and servers like Tomcat. You might be thinking, how come memory leaks in Java? Isn't memory is managed by JVM and Garbage collector? Well, that's true, but poor coding or just a bit of carelessness can cause memory leaks in Java. If you don't know how to configure JVM, troubleshoot memory-related problems on the heap, and stack, you will struggle at a higher level. That's why it's essential for experienced Java developers to spend some time learning these advanced skills as their experience grows.

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.

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. 

Top 6 SQL Query Interview Questions for Programmers and Data Scientists - Best of Lot

SQL, a short form of Structured Query Language is one of the essential skills in today's programming world. No matter whether you are a Java developer, C++ developer or Python developer, you must know how to write SQL queries. Every programming job interview has at least one or two questions that require you to write SQL queries for a given requirement and many developers struggle there. It's easy to answer theoretical questions like what is the difference between clustered and non-clustered index (see) or what is the difference between correlated and non-correlated subqueries (see), but when it comes time to actually write SQL queries to solve problems, it's not that easy, especially if you haven't done your homework and practice.

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? 

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.

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.

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.

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.

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. 

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.

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.

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.

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.

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.

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.

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.