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Can you declare Abstract Class or Method Final in Java? If not, why?

If you are wondering whether you can use both abstract and final modifier together with a class or method in Java then you are not alone. This is one of the frequently asked, theory based Java questions which is sometime tricky to answer, particularly if you don't have complete knowledge of Java fundamentals. The answer of this question is No, you can not declare abstract class or method final in Java because both abstract and final keywords are mutual exclusive. Anything which is abstract cannot be final and vice-versa. It's like a person cannot be living and dead at the same time.

Top 40 Object Oriented Programming [OOP] Interview Questions Answers in Java

OOP Interview questions or Object-oriented programming and design interview question are an integral part of any programming job interviews like Java, C++, or C#. Since Java is an Object-oriented programming language, it's expected from Java developers that he is good at Object-oriented analysis and design and familiar with essential OOP concepts like Abstraction, Encapsulation, and Polymorphism. Object-Oriented Programming Interview question in Java is mainly based around fundamental OOP concept and how those are implemented in Java, like Abstraction OOP concept is implemented using an interface and abstract class, Encapsulation is using private keyword, etc.

Top 20 Stack and Queue Data Structure Interview Questions for 1 to 3 years Experienced

Both Stack and Queue are two of the crucial data structure which is very useful in solving a lot of problems. They are not as fundamental data structures as an array or linked lists but they offer some unique advantages in terms of how you store and access elements. Stack is commonly known as LIFO data structure because the last element you put is the first one to come out while Queue is known as FIFO data structure. The elements are retrieved from the queue in the order they were inserted. Both of these data structure has several usages and are used to solve many common problems and to implement algorithms. 

Top 10 Hibernate Interview Questions and Answers for Java Developers - 3 to 5 Years Experienced

Hibernate Interview Questions are asked on Java J2EE Interviews, mostly for web-based enterprise application development roles. The success and acceptability of Hibernate framework on the Java world have made it one of the most popular Objects Relational Mapping (ORM) solutions in the Java technology stack. Hibernate frees you from database-specific coding and allows you to focus more on utilizing powerful object-oriented design principles to implement core business logic. By using Hibernate you can switch between databases rather easily and also take advantage of out-of-box caching facilities provided by Hibernate, in terms of second-level cache and query cache.

50+ Java Collections and Generics Interview Questions with Answers

Hello guys, If you are preparing for Java interviews then you may know that Java Generics and Collections are two of the most important topics, particularly Generics where some of the trickiest Java questions can be asked. They are also used to gauge your experience and depth of your Java knowledge, hence it's imperative for both beginners and experienced Java programmers to prepare this topic well. While the Java Collection framework provides an implementation of some command data structures like ListSetArray, Hash table, Queue, Stack, PriorityQueue, etc, Generics provides Type safety.

Top 10 Matrix Coding Exercises for Programming interviews and Homework

Matrix is one of the under-rated topic for coding interviews but Matrix coding problems are not that easy to solve and  In this article, we'll see some of the popular Matrix coding problems for coding interviews. I actually learned a lot by solving Matrix related problems. I still remember the first Matrix based problem I solve was about how to multiply two matrices in Java and I learned a lot about multi-dimensional array and nested loop in Java by solving that problem. The second problem I took was about transposing Matrix and that was also quite challenging for me at that time but helped me to further solidify my knowledge about loops and array in Java. 

How to Iterate Over Rows and Cells of Excel file in Java - Example

Hello guys, if want to iterate over all the rows in a excel sheet inside your Java program to process data row by row for example copying from Excel file to Database and you are looking for a pure Java solution then you have come to the right place. Earlier, I have shared how to read from excel file and how to write into Excel file in Java and today, I will show you how to go over all the rows in a Excel file one by one. We will use Apache POI, a popular core Java library to work with Excel files. It support XLS, XLSX and other open office Excel file formats. The library is also open source so you don't need to buy any license or pay for it. All, you need is to include the JAR file in your application's classpath.

10 Free Courses to Learn System Design and Software Design in 2022 - 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 coursesbookswebsites, 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 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. 

Top 5 Websites to Learn System Design and Software Design in 2022

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, 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 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.

How to Learn Kubernetes, AWS, Azure, and Google Cloud using Whizlabs Hands-on Labs ?

Hello guys, Cloud computing is rapidly becoming one of the essential skill for all kind of developers and no matter what you will need to learn Cloud Computing if you want to remain marketable. I learned this truth couple of years ago and since then spent a lot of time learning AWS, Azure, Kubernetes, Docker, and Google Cloud Platform. The big problem with learning Cloud computing and different cloud platform like AWS and Azure is that you cannot learn them by reading books or watching course. You need real, hands-on practice which can only be possible by either using the free tier of respective platform or using hands-on labs like the one provided by Whizlabs and QwikLabs.  In this article, I am going to review Whizlab's comprehensive offering of hands-on labs to learn Cloud related technologies like Kubernetes, AWS, Azure, Openshift, Google Cloud Platform and Snowflake better.

Difference between Checked vs Unchecked Exception in Java? Example

Checked and Unchecked Exception is two types of Exception exist in Java. Though there is no difference in functionality and you can very achieve the same thing with either checked Exception or Unchecked Exception, there is some difference on exception handling part. In this Java tutorial we will see what is checked and Unchecked Exception in Java, Examples of Checked and Unchecked Exception and most importantly we will learn when to use Checked Exception and when to use Unchecked Exception in Java and lastly we will see the difference between checked and unchecked exception to understand things better.