Basic Java Interview Questions
- Q1. Explain JDK, JRE and JVM?
- Q2. Explain public static void main(String args[]) in Java.
- Q3. Why Java is platform independent?
- Q4. Why Java is not 100% Object-oriented?
- Q5. What are wrapper classes in Java?
- Q6. What are constructors in Java?
- Q7.
- Q8.
Likewise, people ask, what are the java interview questions?
Additionally, how do I prepare for Java interview for 12 years experience? For 12 years of experience, you can be asked questions on not only Java but also on related topics like- Spring, Hibernate, Maven etc.
- Step 1: Prepare basic Java interview questions.
- Step 2: Prepare tricky Java interview questions.
- Step 3: Prepare Spring interview questions.
- Step 4: Prepare Hibernate Interview questions.
Also to know is, what should I expect in a Java interview?
To crack this interview you must prepare basic oops concepts, collection, exceptions, multithreading (if worked else basic is enough), strings. In such interviews majority of candidates prepare for advance topics like collection , exceptions etc but fail to answer basic Java questions on string, oops concepts.
What is OOPS in Java interview?
Java is an object-oriented programming language and you will see a lot of object oriented programming concept questions on Java interviews. It makes sense as well, as these are the programmers who must know the OOP basic like Abstraction, Inheritance, Composition, Class, Object, Interface, Encapsulation etc.
17 Related Question Answers Found
What is the basic of Java?
Java is a case-sensitive programming language, like C++. Java is an Object-Oriented Programming (OOP) structure. Java is a class-based programming language. Java technology is used for developing both, applets and applications.
What is oops concept?
OOP concepts in Java are the main ideas behind Java’s Object Oriented Programming. They are an abstraction, encapsulation, inheritance, and polymorphism. Basically, Java OOP concepts let us create working methods and variables, then re-use all or part of them without compromising security.
What are disadvantages of Java?
Let’s have a look on some of the disadvantages of Java: Java is Slow. Java is comparatively slower. Java Takes More Memory Space. Language Limited Latency Critical Tuning. Java’s Architecture Code is Inefficient. No Back-up.
What are the 4 basics of OOP?
The four principles of object-oriented programming are encapsulation, abstraction, inheritance, and polymorphism. These words may sound scary for a junior developer. And the complex, excessively long explanations in Wikipedia sometimes double the confusion.
Why main method is static?
Java program’s main method has to be declared static because keyword static allows main to be called without creating an object of the class in which the main method is defined. In this case, main must be declared as public , since it must be called by code outside of its class when the program is started.
Why Java is Object Oriented?
Java is purely object oriented programming language because without class and object it is impossible to write any Java program. because java supports non-primitive datatypes like int ,float ,boolean,double,long etc.
Why should we hire you examples?
Make his job easier by convincing him that: You can do the work and deliver exceptional results. You will fit in beautifully and be a great addition to the team. You possess a combination of skills and experience that make you stand out from the crowd. Hiring you will make him look smart and make his life easier.
What do you mean by constructor?
A constructor is a special method of a class or structure in object-oriented programming that initializes an object of that type. A constructor is an instance method that usually has the same name as the class, and can be used to set the values of the members of an object, either to default or to user-defined values.
What is Polymorphism in Java?
Polymorphism in Java is a concept by which we can perform a single action in different ways. We can perform polymorphism in java by method overloading and method overriding. If you overload a static method in Java, it is the example of compile time polymorphism. Here, we will focus on runtime polymorphism in java.
What is string in Java?
String is a sequence of characters, for e.g. “Hello” is a string of 5 characters. In java, string is an immutable object which means it is constant and can cannot be changed once it has been created.
What is a class in Java?
Classes and Objects in Java. Classes and Objects are basic concepts of Object Oriented Programming which revolve around the real life entities. Class. A class is a user defined blueprint or prototype from which objects are created. It represents the set of properties or methods that are common to all objects of one
What are the core Java topics?
Topics in core java include following. Language basics such as operators , keywords , basic syntax etc. Methods and datatypes. OOPS concepts. Collection framework. Generics. Exception Handling. Multi threading. AWT and Swing.
How do I interview a Java developer?
25 Must-Read Java Developer Interview Questions 1) What are the features of Java Programming Language? 2) What is the importance of the main() method in Java? 3) What is the difference between path and classpath variables? 4) Is Java Pass By or Pass By Reference? 5) What is the final Keyword in Java?
What are the important topics in Java?
The major topics are listed below: Java Basics – Variables, Data types, Operators, Control Statements,Strings, Arrays and Functions. Object Oriented Concepts – Classes, Objects, Constructors, Inheritance, Abstraction , Abstract classes, Interfaces, Polymorphism, Function overloading, Function overriding.
How can I prepare for Java experienced interview?
Which Topics to Prepare for Java Interviews? Java Fundamentals. Object-Oriented Concepts (questions) Data Structure and Algorithms (questions) Multithreading, concurrency, and thread basics (questions) Date type conversion and fundamentals (questions) Garbage Collection (questions) Java Collections Framework (questions)
What is Java Developer?
A Java developer is a specialised type of programmer who may collaborate with web developers and software engineers to integrate Java into business applications, software and websites.
Where do I ask Java questions?
Top 10 Sites to Ask All Your Programming Questions StackOverflow. StackOverflow boasts a community of 4.7 million programmers who are serious about honing their coding skills. Quora. Quora hosts informative content created and shared by its users. Reddit. StackExchange. CodeProject. Google Groups. CodeRanch. Programmers Heaven.