java basic interview questions
java basic interview questions
Java basic interview questions often revolve around core concepts such as OOP principles, inheritance, polymorphism, encapsulation, and abstraction. Some common topics include explaining the difference between abstract classes and interfaces, the use of constructors, exception handling, multithreading, and collections. Interviewers may also ask about the importance of access modifiers, the concept of static keyword, method overloading versus method overriding, and the role of garbage collection in Java. It is important to have a strong understanding of these fundamental concepts to perform well in Java interviews.
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1 — What is Java?
Java is a widely used object oriented programming language that is designed to have as few implementation dependencies as possible.
2) Why is Java popular?
Java is popular due to its platform independence, meaning that Java programs can run on any device or system that has a Java Virtual Machine.
3) What is a variable in Java?
A variable in Java is a container that holds data values, which can be changed during the execution of a program.
4) How are objects created in Java?
Objects in Java are created using the new keyword followed by a constructor to initialize the object.
5) What is the difference between JDK, JRE, and JVM?
JDK: Java Development Kit includes tools required for developing Java applications
JRE: Java Runtime Environment provides the environment for executing Java programs
JVM: Java Virtual Machine is a runtime instance that executes Java bytecode
6) Can you explain the principle of OOP in Java?
Object oriented programming in Java focuses on creating objects that interact with each other to achieve a specific goal, promoting concepts such as encapsulation, inheritance, and polymorphism.
7) What is the difference between interface and abstract class in Java?
Interface: Contains only method signatures without implementation
Abstract class: Can have both abstract methods and concrete methods
8) How to handle exceptions in Java?
Exceptions in Java are handled using try catch blocks, where the code that might throw an exception is placed in the try block and the exception is caught and handled in the catch block.
9) What are the different types of loops in Java?
The different types of loops in Java include for, while, and do while loops for iterating a set of statements based on a condition.
10) How does Java support multithreading?
Java supports multithreading by allowing multiple threads of execution to run concurrently within a single Java program.
These are some of the basic interview questions related to Java that we cover in our training program for students.
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