Hello guys, If you are preparing for AWS Certified Cloud Practitioner and looking for some affordable awesome online training courses and practice tests to start your preparation then you have come to the right place. Earlier, I have shared free AWS Cloud Practitioner courses, and in this article, I am going to share the best AWS Certified Cloud Practitioner certification online training courses for beginners and anyone who want to learn about AWS and Cloud Computing and also want to earn a certification. In this list, I have selected some of the finest courses from Udemy, Whizlabs, and other places that are both tried and trusted and helped thousands of people to pass these prestigious AWS and Cloud certifications. They are also very affordable and you can take all these AWS Cloud practitioner training tests online.
40+ Java IO and Files Interview Questions with Answers
Good knowledge of Java IO API is important for any Java developer but many of them barely pay attention to Java IO and NIO API, and that's why they often struggle during Java interviews when a question related to Input-Output operation is asked. In the past, I have shared many Java interview questions on topics like Collections, Concurrency, JVM internals, Garbage Collection, OOP, Design Patterns, and Data structure based coding problems, which received good feedback and helped many Java developer on their Java Interview preparation. Consequently, many of my readers were also asking about Java IO and File-based interview questions and this was one of the pending items on my TODO list for quite some time.
Top 5 Free Core Spring, Spring MVC, and Spring Boot Courses for Beginners to learn Online
I have been sharing a lot of resources e.g. books and courses recently and when I published my list of Top 5 courses to learn Spring and Hibernate, many of my readers asked about a similar list of free courses to learn Spring Framework like Core Spring, Spring MVC, Spring Security, and Spring Boot. That request was always back in my mind but I couldn't get time to put together a list, which I can share with you guys, but today is the day. In this list, I have compiled some of the best online free courses to learn Spring Framework from scratch, online at your own pace. You can not only learn core Spring like the framework which provides dependency injection, but also Spring MVC, the most important framework for a Java Web Developer, Spring Security, and Spring Boot to take your career to next level.
A Simple Example to Check if File is Empty in Java
One of the readers of my blog Javarevisited emailed me yesterday about how to check if a file is empty in Java and that's why I am writing this post to show that using an example. The common approach for checking if a file is empty or not is to first check if the file exists or not and then check if it contains any content, but Java has done that hard work for you. Well, it's pretty easy to check emptiness for a file in Java by using the length() method of the java.io.File class. This method returns zero if the file is empty, but the good thing is it also returns zero if the file doesn't exist. This means you don't need to check if the file exists or not.
Top 5 Spring Security Online Training Courses for Java Developers
Security is one of the most important aspects of a modern web application, be it a Java web application, .NET, or writing using any other web technology. In the Java world, Spring Security rule the security space. It's one of the rare frameworks which provided many security features, like authentication, authorization, session management, remember me, and several other useful features out-of-the-box. Since there was no competition for Spring security and it does its job very well, it soon becomes the de-facto standard for implementing security in both Java web applications, REST APIs, and core Java applications. The rise of the Spring framework certainly helps it to cement its place as well.
Top 25 Examples of ConcurrentHashMap in Java [Tutorial]
The java.util.ConcurrentHashMap is one of the most important classes of JDK. It was introduced in JDK 1.5 along with other concurrent collection classes like CopyOnWriteArrayList and BlockingQueue. Ever since then, it has been a workhorse in concurrent Java applications. It won't be an exaggeration If I say there is hardly any concurrent Java application that has not used ConcurrentHashMap yet. The class was another implementation of Java .util.Map and a popular hash table data structure with concurrency inbuilt. This means you can also pass a ConcurrentHashMap to a method that is expecting a java.util.Map object. It was made scalable by dividing the whole map into a different segment, known as concurrency level, and then allowing threads to modify segments concurrently.
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