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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.
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.
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.
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.
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
List,
Set,
Array,
Hash table,
Queue,
Stack,
PriorityQueue, etc, Generics provides Type safety.
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.
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.
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 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.
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.
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.
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.