March 2023

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.

Top 50 Java Thread and Concurrency Interview Questions Answers for 2 to 5 Years Experienced

You go to any Java interview, senior or junior, experience or freshers, you are bound to see a couple of questions from the thread, concurrency, and multi-threading. In fact, this built-in concurrency support is one of the strongest points of the Java programming language and helped it to gain popularity among the enterprise world and programmers equally. Most of the lucrative Java developer position demands excellent core Java multi-threading skills and experience in developing, debugging, and tuning high-performance low latency concurrent Java applications. This is the reason, it is one of the most important topics in Java interviews. Multithreading and concurrency are also hard to master the concept and only good developers with solid experience can effectively deal with concurrency issues.

Difference between get and load in Hibernate

get vs load in Hibernate

Difference between get and load method in Hibernate is one of the most popular questions asked in Hibernate and spring interviews. Hibernate Session class provides two methods to access object e.g. session.get() and session.load() both looked quite similar to each other but there are subtle differences between load and get method which can affect the performance of the application. The main difference between get() vs load method is that get() involves database hit if an object doesn't exist in Session Cache and returns a fully initialized object which may involve several database calls while load method can return proxy in place and only initialize the object or hit the database if any method other than getId() is called on persistent or entity object.

Difference between save vs persist and saveOrUpdate in Hibernate

Save vs. saveOrUpdate vs. persist in Hibernate

What is the difference between save and saveOrUpdate or Difference between saving and persist are common interview question in any Hibernate interview, much like the difference between get and load method in Hibernate. Hibernate Session class provides a couple of ways to save an object into the database by methods like save, saveOrUpdate, and persist. You can use either save(), saveOrUpdate() or persist() based upon your requirement for persisting objects into the database. The key thing is that all these objects are used to store data into the database but they also make a transient object persistent in Hibernate.

How to send HTTP POST Request with JSON Payload to REST API using Curl Command?

There are many ways to test your RESTful Web services developed using Spring MVC e.g. you can use RESTAssured for automation testing or you can use Postman to manually test your RESTful Web service but nothing beats the elegant, comfort, power, and simplicity of using curl command to test RESTful web service. It is my favorite tool to test any RESTful web service and I have used in past to test various aspect of Spring REST application e.g. testing headers, testing authentication and authorization, testing different content types like JSON and XML, testing cookies, and testing different HTTP methods to perform CRUD operations.

How to Consume JSON from RESTful Web Service and Convert to Java Object - Spring RestTemplate Example

So far, I have not written much about REST and RESTful web service, barring some interview questions like REST vs. SOAP, which is thankfully very much appreciated by my readers, and some general suggestions about the best books to learn REST in the past. Today I am going to write something about how to consume JSON from a RESTful Web Service in Java using Spring Framework. I will also talk about how to convert the JSON to Java objects using Jackson. You will also learn about the RESTTemplate class from the Spring MVC framework, and how you can use it to create a REST client in Java in just a few lines of code.

Difference between REST and GraphQL API with Example

Hello guys, I have been learning GraphQL since last week and should I say, I am really impressed with its flexibility and how it address some of the pertinent problems with REST APIs. If you don't know, The GraphQL is a query language from Facebook which aims to solves some common problems with REST like a explosion of endpoints, over fetching and under fetching of data, response structure, versioning, and most important performance and Scalability. If you have used REST APIs then you know that you need to send a lot of request to get the data you want. You not only need send multiple request but also you get a lot of unnecessary data which you don't really need, and also need to know multiple endpoints.

Top 5 Tools for Testing REST APIs and RESTful Web Services in 2023 - Best of Lot

Hello guys, If you are a Java or web developer working on REST APIs and RESTful web services and looking for some tools to test your APIs and web services then you have come to the right place. Earlier, I have shared the best books and courses for RESTful web services and in this article, I am going to share five awesome but easily accessible and free tools to test your REST APIs. These REST API testing tools will help you to test your APIs as you build, starting from unit testing to integration testing and then fully automating your resting to create a regression pack. You can also use these tools to interact with your REST API during the development phase for quick tests.

What is the use of DispatcherServlet in Spring MVC Framework?

If you have worked with Spring MVC then you should know what is a DispatcherServlet? It's actually the heart of Spring MVC, precisely the C of MVC design pattern or Controller. Every single web request which is supposed to be processed by Spring MVC goes through DispatcherServlet. In general, its an implementation of Front Controller Pattern which provides a single point of entry in your application. It handles all incoming requests. It is also the bridge between Java and Spring. Btw, the DispatcherServlet is like any other Servlet is declared in the web.xml with a URL pattern but the only special thing is that the URL pattern for dispatcher servlet is enough to map every single web request to DispathcherServlert.

7 Reasons to use Spring Framework for Creating RESTful Webservices in Java

REST has now become a standard way to develop web services and when it comes to Java, there are many frameworks and libraries available like JAX-RS, Restlet, Jersey, RESTEasy, Apache CFX, etc, but I encourage Java developers to use Spring framework to develop RESTful web services. But, some of you might ask, why use Spring Framework to develop RESTful web services in Java? What is the advantage and why it's better than other frameworks and libraries available out there? Well, the most important reason I think to use Spring for developing RESTful web service is that you can use your Spring MVC experience to develop RESTful web services.

Eclipse - How to Fix java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet in Tomcat

Problem: You are getting java.lang.ClassNotFoundException exception complaining that Spring's DispatcherServlet class is not available in the classpath. This error is coming while running a Spring MVC based Java application from Eclipse and Tomcat as Server (running inside Eclipse IDE itself). You have either included spring framework JAR files manually by yourself or you are using Maven to download and manage dependent JAR files. Here is the stack trace of this error :

java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:525)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:507)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:126)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1099)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1043)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4957

20 Essential Tools for DevOps Engineers and Senior Developers in 2023

Hello guys, If you are thinking to become a DevOps Engineer in 2023 or just want to take your DevOps skills to next level then here is a list of some of the essential tools for DevOps professionals. DevOps engineers and senior developers are responsible for managing and automating the software development process, from planning and coding to testing and deployment. To accomplish these tasks efficiently and effectively, they require a range of tools and technologies that can help them streamline their workflows and increase productivity. In this article, you will learn about 20 essential tools that every DevOps engineer and senior developer should have in their toolkit.

What is bean scope in Spring Framework? Singleton, Prototype, Request scopes Example Tutorial

Java classes or POJO which are managed by Spring Framework are called Bean or Spring Bean and Bean scope in Spring framework or Spring MVC is scope for a bean managed by Spring IOC container. You may know that Spring is a framework that is based on Dependency Injection and Inversion of Control and provides bean management facilities to Java application. In Spring-managed environment bean (Java Classes) are created and wired by the Spring framework. Spring allows you to define how those beans will be created and the scope of the bean is one of those details. Scope are similar to access modifiers in Java which specifies visibility of a particular class.

How View Resolver works in Spring MVC? [InternalResourceViewResolver Example]

Hello guys, if you are wondering what is view resolver in Spring MVC and what role InternalViewResolver class plays in Spring MVC then you have come to the right place. Earlier, I have explained to you how Spring MVC works internally and how it processes HTTP requests coming to your web application. One of the important parts of that processing was resolving views, which is handled by the ViewResolver interface, which is the V part of MVC. They are responsible for returning correct views to the client, both in the Spring MVC application as well as on REST APIs. In this article, you'll learn more about view resolvers in Spring MVC by explaining the InternalResourceViewResolver class.

Difference between @RestController and @Controller Annotation in Spring MVC and REST

The @RestController annotation in Spring MVC is nothing but a combination of @Controller and @ResponseBody annotation. It was added into Spring 4.0 to make the development of RESTful Web Services in Spring framework easier. If you are familiar with the REST web services you know that the fundamental difference between a web application and a REST API is that the response from a web application is generally view (HTML + CSS + JavaScript) because they are intended for human viewers while REST API just returns data in form of JSON or XML because most of the REST clients are programs. This difference is also obvious in the @Controller and @RestController annotation.

Top 5 Java Frameworks for Microservices Architecture in 2023 - Best of Lot

Hello Java Programmers, if you are thinking about Microservice Architecture and Cloud-Native development in Java and exploring options like frameworks, libraries, and technologies then you have come to the right place. Earlier, I have shared the best Microservice courses, and Microservice design patterns and in this article, I am going to share the best Microservice Framework for Java developers. While you may know that Spring Boot and Spring Cloud is the leading framework for developing Microservice applications in Java, there are a couple of more options as well like MicroNaut, DropWizard, and Quarkus IO. In this article, you will learn about the top 5 frameworks you can use to develop Microservice in Java.

Spring Boot + Hibernate Tutorial and Example for Java Developers

Hello guys, if you want to learn how to use Spring Boot and Hibernate together in a Java application and look for examples and tutorials then you have come to the right place. In the past, I have shared how to use Spring Boot with MyBatis and Spring Boot + Redis example and In this article on Spring Boot, we will discuss how to integrate Spring Boot with Hibernate. We will build a simple Spring Boot application and use Hibernate to store the data. So first, let's look at what is Hibernate in Java? Hibernate framework provides an abstraction layer which means programmers need not worry about implementation. Hibernate will implement different modules for developers internally like writing queries to perform CRUD operations on the database and establishing connections to different kinds of databases. This is a Java-based solution for object-relational mapping.

Difference between @ContextConfiguration and @SpringApplicationConfiguration in Spring Boot Testing?

Hello folks, what is the difference between @ContextConfiguration and @SpringApplicationConfiguration is one of the frequently asked Spring Boot Testing interview questions which is often used to check if the candidate knows about how to unit test Spring boot application. Even though both @ContextConfiguration and @SpringApplicationConfiguration annotations are used along with SpringJUnit4ClassRunner to specify how to load the Spring application context, there is a subtle difference between them. Although @ContextConfiguration does a great job in loading application context it doesn't take full advantage of Spring Boot features. Spring Boot applications are ultimately loaded by either SpringApplication ( in the case of the JAR) or SpringBootServletInitializer.

What is @SpringBootApplication Annotation in Java and Spring Boot? Example Tutorial

Hello guys, if you are wondering what is @SpringBootApplicaiton annotation and how to use it then you have come to the right place. Today, we'll learn about the @SpringBootApplication annotation, one of the most important annotations from the popular Spring Boot framework, which has changed the way Java developers use the Spring framework for writing Java applications. In this article, I'll explain to you the meaning of @SpringBootApplication and its use in a simple Spring Boot application. We use @SpringBootApplication annotation on our Application or Main class to enable a host of features e.g. Java-based Spring configuration, component scanning, and in particular for enabling Spring Boot's auto-configuration feature.

Difference between BeanFactory and ApplicationContext in Spring Framework

The difference between BeanFactory and ApplicationContext in Spring framework is another frequently asked Spring interview question mostly asked Java programmers with 2 to 4 years experience in Java and Spring. Both BeanFactory and ApplicationContext provide a way to get a bean from the Spring IOC container by calling getBean("bean name"), but there is some difference in their working and features provided by them. One difference between the bean factory and application context is that the former only instantiates bean when you call getBean() method while ApplicationContext instantiates Singleton bean when the container is started, It doesn't wait for the getBean to be called.

What is a Spring Data Repository? JpaRepository, CrudRepository, and PagingAndSortingRepository Example

Hello Java developers, if you are wondering what is Spring Data Repository interfaces like JpaRepository, CrudRepository, and PagingAndSortingRepository and how to use them then you have come to the right place. Earlier, I have shared the best Spring Data JPA courses and in this article, I will give you an overview of different Spring Data Repository interfaces and how to use them with step-by-step examples. The Java Persistence API (JPA) is the standard way of persisting java objects into relational databases.

How to return different HTTP status code from a Spring MVC controller? Example Tutorial

Hello guys, if you are wondering how to return different HTTP Status codes from a Spring MVC controller then you have come to the right place. You can use @ResponseCode annotation on Spring MVC to send different HTTP codes to the client as part of the HTTP response. If you are developing REST APIs then you can even @RestControler to do that job. This article will demonstrate how to return different HTTP statuses for a Spring MVC controller. Prior to implementation, all we need to understand what is with the HTTP return types and why we need them. Let's have a quick look into this.

How to transpose a Matrix in Java? Example Tutorial

Hello guys, if you are wondering how to transpose a matrix in Java then you have come to the right place. Matrix related coding problems are great way to learn multi-dimensional array and nested loop and they are good programming exercise for beginners. In the past, I have taught you how to multiply matrices in Java and how to add/subtract matrices in Java, and in this article, I will show you how to create transpose of a given matrix in Java, but before that let's first understand what is transpose of a matrix means and how do you transpose a matrix in maths? Well, a transpose of a matrix is nothing but a matrix whose rows and columns are reversed.

[Solved] How to find and Print Armstrong number between 0 and 9999 in Java? Example

An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. For example, 153 is an Armstrong number, since 1**3 + 5**3 + 3**3 = 153, 371 is an Armstrong number since 3**3 + 7**3 + 1**3 = 371. Along with usual beginner exercises like calculating factorial, reversing a string, or calculating prime numbers, this is a good exercise to build programming logic. It teaches you basic programming techniques of how to use the operator for something which is not obvious.

Java Program to Multiply Two Matrices - Matrix Multiplication Example

How to write a Java program to multiply two matrices in Java is a very good programming exercise to get familiar with the two-dimensional array in Java. this example teaches about how to multiply arrays, how to access elements from a multi-dimensional array, how to pass them to a function etc. Since the matrix is a natural representation of a multi-dimensional array in Java, they are often used to illustrate real word matrix exercises e.g. the calculating sum of two matrices or calculating the difference of two matrices, etc. It's also one of the popular Matrix based coding problems you can find on coding interviews.

Why use @Override annotation in Java? Coding Best Practice Example

@Override annotation was added in JDK 1.5 and it is used to instruct the compiler that method annotated with @Override is an overridden method from super class or interface. Though it may look trivial @Override is particularly useful while overriding methods that accept Object as a parameter just like equals, compareTo or compare() method of Comparator interface. @Override is one of the three built-in annotations provided by Java 1.5, the other two are @SuppressWarnings and @Deprecated.

Top 10 Hiring Tips for Technical Interviewers and Hiring Managers

Hello guys, For a change, this article is not for candidates who are preparing for interviews, but for those programmers who are responsible for taking interviews. At some point in your career as a programmer, you will have the responsibility to hire developers for your company. This is a big responsibility and your ability to select the right candidate will directly affect your company's future. This is more visible in small companies than the larger organization where a pool of interviewers exists. In a start-up, if you are a technical lead and responsible for hiring, it's a tough job. You have to hire the right candidate which fits in companies culture and competent enough to do the job they were hired for. To be frank, conducting interviews is as hard as giving interviews.

10 Reasons to Learn Java Programming Language in 2023 and Why Java is Best

Java is one of the best programming languages created ever, and I am not saying this because I am a passionate Java developer, but Java has proved it in the last 20 years. Two decades is a big time for any Programming language, and Java has gained strength every passing day. Though there are times when Java development slows down, Java has responded well. Earlier with groundbreaking changes in the form of Enum, Generics, and Autoboxing in Java 5, performance improvement with Java 6, functional programming using the lambda expressions in Java 8, and Google's choice of language for Android apps development keeps Java as a front-line programming language.

How to use MyBatis in Spring Boot application in Java? Example Tutorial

Hello guys, In this tutorial, we will discuss how to create a spring boot project with MyBatis. First, you need to have a better understanding of what is MyBatis and its use-cases. MyBatis is a SQL mapping framework with support for custom SQL, stored procedures, and advanced mapping. Although Spring Boot does not officially support MyBatis, the MyBatis community has created a Spring Boot startup for MyBatis.This is the most commonly used open-source framework for implementing SQL databases access in java applications.

Top 16 JMS (Java Messaging Service) Interview Questions and Answers

Java messaging Service or JMS interview questions is one of the important parts of any Core Java or J2EE interview as messaging is a key aspect of enterprise Java development. JMS is a popular open-source Messaging API and various vendors like Apache ActiveMQ, Websphere MQ, Sonic MQ provides an implementation of Java messaging API or JMS. Any Java messaging services or JMS interview can be divided into two parts where the first part focuses on fundamentals of JMS API and messaging concept like What is topic, What is Queue, publish-subscribe or point to point model, etc, While the second part is related to JMS experience with particular JMS provider.

10 Free Courses to Learn System Design and Software Design in 2023 - Best of Lot

Hello guys, if you are preparing for System Design Interview or just want to improve your Software design skills and looking for best free resources like tutorials and free online courses then you have come to the right place. In the past, I have shared best System design courses, books, websites, and popular System design questions but a lot of you asked for free resources and that's why I am going to share best free System design courses I found online. These online System Design training courses are completely free and provides a diverse knowledge about different System design concepts and process. They are also created by experienced trainers and teacher who has gone through the same process and available on trusted online platforms like Udemy and YouTube. You can join one or more of these free System design courses to not only improve your Software design skill but also to prepare for your next System Design Interview.

System Design Interview Prep Guide 2023 - Topics, Questions, and Resources

Hello guys, if you are preparing for Software Engineer or Software developer interview then you may know that how difficult it is to prepare for System Design given its open ended nature and vastness but at the same time you cannot ignore it. In Software Engineering world, if you are applying for a Senior Engineer / Lead / Architect / or a more senior role, System Design is the most sought-after skill, and hence one of the most important rounds in the whole process. If you mess this up, nothing else would matter. If you get it right though, you’re looking at a raise of at least tens of thousands of dollars annually. So how do you ace your system design round? Well, here’s what I did while preparing for my interviews with Facebook, Google, and Amazon, and it worked out rather well. I did end up creating a checklist for myself which got me through most of my rounds, so if you follow a similar path you should be able to come up with something that works for you as well.

How to enable disable Form elements in web page using jQuery? Example Tutorial

In last couple of tutorials you have learned how to get all selected checkbox and radio buttons, and in this tutorial, you will learn how to enable/disable form elements using jQuery. A form element e.g. a text field, radio buttons and checkbox, all represented using input tag can be enabled or disabled by adding an attribute called "disabled". It's similar to "checked" attribute we have seen for checkbox and radio buttons. If this attribute is not present then element is enable, but if this attribute is present then you can use disabled=true to disable the form element and disabled=false to enable the form elements as shown in our example. Like previous example of checking/unchecking checkbox, you can use prop() jQuery function to enable/disable form element if you are running on jQuery 1.6 or higher version and attr() function if you are running on jQuery 1.5 or lower version.

How to reload/refresh a page using JavaScript and jQuery? Example

Hello guys, if you are wondering how to reload or refresh a web page then don't worry JavaScript provides several ways to reload or refresh an HTML page but the standard way to do this job is by using window.location object. This object provides a reload() method which instructs the browser to reload the page. The browser can do it from its cache or from the server, which depends upon optional parameter i.e. reload(true) will reload the page from the server but reload(false) will only reload the page from the browser's cache, which may or may not represent the current version at the server.

Top 10 System Design Courses for Software Engineer Interviews in 2023 - Best of Lot

Hello guys, if you are preparing for System design interview and looking for best online courses to learn essential System design concepts like load balancing, scalability, architecture as well as how to solve popular System design questions like how to design YouTube, WhatsApp, Parking Lot, Library System as well when to use NoSQL and SQL then you have come to the right place. In the past, I have shared best System Design Books, Free System design courses, System design prep guide, and System Interview Questions and in this article, I am going to share best places to learn System design in 2022. Before we get to the best Before we get to the 9 best courses that will teach you everything you need to know about system design interviews, let me tell you a little bit about what it really is.

Top 5 Online Courses to Learn Kubernetes in 2023 - Best of Lot

Hello guys, Kubernetes has become a very popular tool and skill today in the container management community, and it's one of the most in-demand skills and a must-learn tool for both DevOps engineers and Developers. It is a tool written in Golang and it is created by Google. There are many things you need to take care of when working in production environments with microservice patterns and containers. These include version control, health check, rollback mechanism, and scaling. Kubernetes provides the management and orchestration capabilities to deploy containers in accordance with all the necessary mentioned things.

Top 10 Scala and Groovy Frameworks Java Developers can learn in 2023 - Best of Lot

Hello guys, Groovy and Scala have been around for some time. Some useful Groovy and Scala frameworks can help Java developers create better applications and products like Microservices et al. l. If you are interested in learning the best Scala and Groovy framework, then you have come to the right place. In the past, I have shared the best courses to learn Scala and Groovy, and In this article, we are going to take a look at some of the best Scala and Groovy frameworks that can be useful in Java development Akka, Lagom, Play, Spock, Gradle, and Grails. I'll also share links to some valuable courses to learn these practical Groovy frameworks.

How to redirect a page or URL using JavaScript and JQuery - Example

Redirecting a web page means, taking the user to a new location. Many websites uses redirects for many different reasons, e.g. Some websites redirect users from the old domain to new domain, some redirect from one page to another e.g. a more relevant page. If you are a Java programmer and worked previously with Servlet and JSP, then you might be familiar with SendRedirect and Forward methods, which are used to redirect users in web applications. Actually, there are two kinds of redirect, Server side redirect, and client-side redirect. In Server side redirect, the server initiates redirection, while in a client-side redirect, the client code does the redirection. Redirecting a web page using JavaScript and JQuery is a client-side redirection.

Top 10 Udemy Courses for Python, JavaScript and Web Development in 2023 - 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 running a sale now. 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 2023? 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.

Top 5 Udemy Courses to Learn System Design and Software Design in 2023 - Best of Lot

Hello guys, if you are preparing for technical interviews for Software Engineering job then you may be aware of Software Design or System design. It is one of the most important but at the same time very tough topic to master and many programmers even experienced developer struggle to solve System design problems during interview, particularly while interviewing with top tech companies like Google, Meta, Amazon, Apple, Microsoft, Netflix etc, popularly known as FAANG. If you are also preparing for programming job interview and looking for best System design and Software design resources then you are at the right place. Earlier, I have shared best System Design Books, System Design Questions and best Places to learn System Design and in this article, I am going to share best System Design Interview courses from Udemy, one of my favorite place to learn programming and technical stuff.

Top 7 System Design and Software Analysis and Design Books in 2023 - 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.

ByteByteGo Review - Is ByteByteGo System Design Interview Course by Alex Xu worth it in 2023?

Hello guys, if you are preparing for System Design Interview then you may have come across names like ByteByteGo, Alex Xu or System Design Interview – An insider's guide book 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. In this article, I will provide my detailed review and opinion on ByteByteGo and his popular System Design Interview - An Insider's guide book. Though, if you are in hurry and just need a second opinion, I suggest you to go for it. The value Byte Byte Go course provides is much more than the price you pay. It's one of the most comprehensive, up-tp-date, and easy-to-learn System design course I have come across and I highly recommend it to every Programmer and Software Engineer, irrespective of whether you are preparing for System Design Interview or not. It will help you to become a better developer in quick time.

Top 10 System Design, Software Design, and OOP Design Courses from Educative in 2023 - Best of Lot

Hello guys, if you are preparing for System Design Interview and looking for best resources then you have come to the right place. Earlier, I have shared best System design book, courses, and System design interview questions and in this article, I am going to share in-depth System design courses from Educative.io, a text based online learning platform for developers and engineers. These are the best online courses to prepare for System Design Interviews in 2023. If you have been doing Software development then you know that System design is one of the most important skill for developers and managers. System Design and Software Design are not just a tool pass interviews but it's the way we build modern Software and that's why a good knowledge of System design is required to become a better Software Engineer.

Top 8 Courses to Learn about NFTs (Non Fungible Tokens) in 2023 - Best of Lot

Hello guys, if you want to learn what is NFT or Non Fungible Token and what is the buzz around NFT, and have questions like should you create and sell NFT etc then you have come to the right place. Earlier, I have shared best online courses to learn Blockchain and crypto currencies and in this article I am going to share best online courses to learn NFTs, but before that, let's understand what is NFT? NFTs or else known as Non-Fungible Tokens are a form of digital art. Non-Fungible basically means that they are unique. If you own one NFT, there’s nothing else in this world that is the same as yours. Nothing! That uniqueness and sense of ownership is driving crazy sales with recent reports suggesting that NFT sale clocking at around $70 million and increasing exponentially.

jQuery Tutorial - How to modify multiple HTML elements in one line? Example

jQuery allows you to modify multiples elements in one go, you can modify attributes, text, or color of multiple HTML elements by executing just one line of jQuery code. In this jQuery tutorial, I will show you how to modify multiple <li> elements in one go. In our example, we have a couple of <li> tags to display sub-headings, now we will change them in one go using jQuery. If you look at our HTML, we have an ordered list <ol> to display the top 10 programming languages, each of them is an <li> item. We also have one button, "Click Me", which will when clicked, change all <li> item's text to "jQuery is the new Boss". Here is the jQuery code, which does that.

7 jQuery Selectors Examples for Beginners - Tutorial

jQuery selectors are like CSS Selectors, which allow you to find or select an element from the DOM tree. When HTML pages loaded in a browser like Chrome, Firefox, or Internet Explorer, the browser creates a tree-like structure is known as Document Object Model or DOM. JavaScript and jQuery allow you to play with this DOM i.e. selecting elements from DOM, traversing through DOM, going from one element to another, selecting a list of elements from DOM, adding or removing elements from DOM, etc.

Top 10 Free Courses to learn Spring Framework and Spring Boot in 2023 - Best of Lot

Hello guys, if you want to learn Spring Framework and looking for best online resources like books, courses, and tutorials then you have come to the right place. Earlier, I have shared best Spring Framework courses, books, and Spring interview questions and in this article, I am going to share best free courses to learn Spring framework in 2023. When I shared the list of best Spring Courses, a lot of you asked me about free spring courses and this article is the result of that research, but before we get to the 10 best free Spring courses that are perfect for beginners, let me tell you more about what the Spring Framework really is.

Top 16 Lambda Expressions and Stream API Interview Questions Answers for Experienced Java Programmers

For a long time my readers were asking about some Java 8 interview questions, particularly on lambda expression, streams and around language changes e.g. default methods, method reference and functional interface. Finally, I am able to put some common Java 8 interview questions on lambda expression and Stream API and essential functional programming concepts like map, flatmap, and reduce together, which I going to share with you in this article, but before that, let's talk a little bit about impact of Java 8 in Java Developers interviews and why it's imperative for Java programmers to learn Java 8, particularly Lambda and Stream API.

How to find all unchecked checkboxes from a page using jQuery? Example Tutorial

Hello guys, In the last tutorial, you have learned how to get all the checked checkboxes from a page using jQuery, but sometimes you also need all the checkboxes which are not selected. In this tutorial, you will learn that. If you remember, we have used the:checked pseudo selector to get all checked checkboxes, but, unfortunately, there is nothing like the :unchecked selector in jQuery, so using that will result in the syntax error. Even the!:checked or :!checked will not work, instead, you need to use not() jQuery selector, which does the negation job.

How to find a Good Programmers on Tech Interviews?

When it comes to interview, goal is to find the most suitable developer for job to get done but its very difficult to judge someone's caliber, experience and expertise in short duration of Interview. There is always a process starting from phone interview, written tests to face-to-face interview, but its still difficult to hire the right programmer. Process can help you to filter candidates but eventually it will come down to your experience and gut feeling. As you take more and more interviews, you will know what to ask and what not and like many other interviewers in the world, you will develop some of your own tips. Similarly, I have developed couple of tips from my experience which has helped me to differentiate an average programmer with a good programmer in past.

Top 5 Courses to Learn Recursion for Dynamic Programming in 2023 - Best of Lot

Hello guys, if you want to learn and Master Recursion and looking for the best resources like books, online courses, and tutorials then you have come to the right place. Earlier, I have shared the best dynamic programming courses, and 15 Recursion exercises for beginners, and today, I am going to share the best courses to learn Recursion for beginners. Recursion is the process by which a function calls itself again and again directly or indirectly. These types of functions are called recursive functions. All successful software programmers need to have an understanding of how recursive functions work as well as how to build recursive functions.

Top 10 Java SE 17 Certification Practice Questions and Mock test for 1Z0-829 Exam - Free

Hello guys, if you are preparing for 1Z0-829 certification exam to become a Oracle certified Java SE 17 Developer in 2023 and looking for practice question for preparation then you have come to the right place. In this article, I am going to shared 10 Java SE 17 Practice question from my new Udemy course. It's been a long time since I released any course on Udemy and today, I am excited to announce the launch of my new course - Java SE 17 Mock Test for the 1Z0-829 Exam. I have been working on this course for a long time, ever since this exam was announced and if you follow me on Twitter then you know that as well. If you want to become a certified Java developer in 2023 then you can join this course on Udemy and prepare well to pass this prestigious exam and become Oracle Certified Java SE 17 developer in 2023.I have spent a lot of time making this course as best as possible to help prepare for this exam and learn Java better.

How to Fix 'javac' is not recognized as an internal or external command in Windows and Linux? Example

Hello guys, if you are trying to compile your Java source file and getting "'javac' is not recognized as an internal or external command" in Windows or Linux machine like Windows 10 or Redhat 8 but not sure what to do then you have come to the right place. This is a common Java related error and can occur to an operating system like Windows, Mac or Linux if java is not installed properly like only JRE is installed and JDK is not installed or javac is not added on PATH environment variable. In this article, I will explain what this error is and how you can fix it by following step by step guide I share, but if you still cannot solve this problem on your own then just ask for help in comments. But don't forget to check your PATH environment variable because that's where JDK/bin directory needs to be present, which contains all Java related commands including "javac" and "java" which are used to compile and run Java applications.

10 Essential Git commands Every Java Developer Should Know

Hello guys, if you are a Programmer you probably have heard about Git, well most of you might have already been veteran into Git and don't need any more articles and tutorials, but if you are a beginner then Git is one of the most important skill to learn. If you are a Computer Science graduate, a Software Engineer, or even a Student trying to learn Programming on your own, Git is a must-know skill for you. If you already know the importance of Git and looking for best resources to learn Git then you have come to the right place. Earlier, I have shared best free Git courses and best places to learn Git and in this article, I am going to share examples of essential git commands which every programmer should know.

Top 5 Spring and Hibernate Training Courses for Java JEE Programmers - Best of Lot

Spring and Hibernate are two of the hottest and most in-demand web frameworks in the Java world and also two of the most essential skill for any Java programmer to get a job in the web development space. The Spring framework is in around 2004 and established itself as the leading framework to develop Java applications both in core Java and web development areas. The Spring framework comes with a lot of modules to support different kinds of developments like Spring Security to address the security requirements of most web and enterprise Java applications. It supports single sign-on, LDAP authentication, Role-based access control, and much more such essential features. Spring also supports the development of REST services which is now become a standard way to provide web services.

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