Java Interview Questions & Answer for Freshers-2020
Information & Technology. In a digitized world, the importance of these two words cannot be denied no matter which industry we cater to. Computers and the internet are everywhere, and they run our lives. Programming is essential to enhance the power of these computers and the internet. It helps in speeding up the input and output processes in machines across the world. That’s where Java plays a critical role.
Java is a programming language, and if the research from The Cloud Foundry Foundation is to go by, Java and JavaScript remain highly influential in spite of the substantial growth of other programming languages such as R and Python.
Without a doubt, Java developers have excellent career prospects. Java implies fast performance, reliability, and security.
“More than 3 billion devices run Java! Well-trained, highly skilled Java professionals are in demand.” — www.education.oracle.com
We have collected some of the most frequently asked Java interview questions and answers from experts around the world. Also, we’ll briefly explain why Java Programming Certification Classes from NetCom Learning could be helpful for you.
Possible Java Questions & Answers in Interview
Ques: How do you define JVM?
Ans: One can expand JVM as a “Java virtual machine.” It includes Java interpreter and the runtime environment necessary to run the Java application.
Ques: Java is platform-independent. Please explain this statement.
Ans: The activity of writing code in Java on composing converts to bytecode (.class) can be performed on any platform. The compiled code can be run on any platform ranging from Windows to Unix/Linux and others.
Ques: How are JDK and JVM different?
Ans: JDK- Java Development Kit. It is used for development purpose and includes an execution environment.
JVM- Purely a run time environment. It does not allow you to compile source files.
Ques: What is the base class of all classes?
Ans: java.lang.Object
Ques: Define access modifiers in Java.
Ans: Java has 3 access modifiers- Public, protected and private. It also has a default one if no identifier is specified. It is called “friendly.”
Ques: What is a package?
Ans: It is a collection of related classes and interfaces, and it provides namespace management and access protection.
Ques: Define Inheritance and what are its advantages?
Ans: Inheritance can be defined as the process of inheriting all the features from a class. The advantages include reusability of code, accessibility of variables and methods of the superclass by subclasses.
Ques: What is the difference between subclass and superclass?
Ans: A superclass is inherited, the subclass is a class that does the inheriting.
Ques: How do you define an abstract class?
Ans: It is a class designed with implementation gaps for subclasses to fill in and is purposefully incomplete.
Ques: Name the states associated in the thread?
Ans: Thread has ready, running, waiting and dead states.
Ques: Define synchronization.
Ans: It is the capability to control the access of multiple threads to any shared resource.
Ques: Define deadlock.
Ans: The program is said to be in a deadlock when two threads are waiting for each other, and they can’t precede each other.
Ques: Define an applet.
Ans: It is a dynamic and interactive program running inside a web page displayed by a java capable browser.
Ques: What is the lifecycle of an applet?
Ans:
· init() method — when an applet is first loaded.
· start() method — Each time an applet is started.
· paint() method — When the applet is minimized or maximized.
· stop() method — When the browser moves off the applet’s page.
· destroy() method — When the browser is finished with the applet.
Ques: How can you set security in applets?
Ans: We can do it by using the setSecurityManager() method.
Over the last few years, Java has developed substantially. Oracle Java Certifications can lead to better job opportunities, promotions, and attractive pay packages while validating your knowledge and skills of the technology.
Why NetCom Learning?
NetCom Learning is an experienced and well recognized IT, Business training solutions provider with more than two decades of industry experience. We specialize in delivering multiple certification and training courses to individual users, corporate customers, and various governments across the globe.
You may go through our Online Java Certification Training classes for all the details you need and any questions you might have.
Our Java Certification Training Classes will provide you a career-enhancing and rewarding experience.
