Core java interview questions for freshers

 

core Java interview questions along with their answers for freshers:

1. What is Java?
– Java is a high-level, object-oriented programming language that is platform-independent and designed to have as few implementation dependencies as possible.

2. Explain the difference between JDK, JRE, and JVM.
– JDK (Java Development Kit) is a software development environment used for developing Java applications. It includes the JRE and development tools like the compiler and debugger.
– JRE (Java Runtime Environment) is an environment that provides the necessary runtime support for executing Java applications. It includes the JVM and libraries required to run Java programs.
– JVM (Java Virtual Machine) is a virtual machine that executes Java bytecode. It provides a runtime environment in which Java programs can run regardless of the underlying hardware or operating system.Core java interview questions for freshers

3. What are the main features of Java?
– Object-oriented: Java follows an object-oriented programming paradigm, allowing for encapsulation, inheritance, and polymorphism.
– Platform-independent: Java programs can run on any platform with a Java Virtual Machine (JVM).
– Simple and easy to learn: Java has a concise syntax and eliminates complex features, making it easier to write and understand.
– Robust and secure: Java has strong memory management, exception handling, and built-in security features.
– Multi-threaded: Java supports multithreading, allowing for concurrent execution of multiple threads within a program.
– High performance: Java optimizes performance through just-in-time (JIT) compilation.

4. Differentiate between a class and an object in Java.
– A class is a blueprint or template that defines the properties and behavior of objects. It encapsulates data and methods that can be used to create multiple objects.
– An object is an instance of a class. It represents a real-world entity and has its own state and behavior. Objects are created using the `new` keyword followed by a constructor.

5. What is the difference between static and non-static methods in Java?
– Static methods belong to the class rather than a specific instance of the class. They can be called using the class name directly, without creating an object of the class.
– Non-static methods are associated with objects of the class. They can only be called on an instance of the class.

6. Explain the concept of inheritance in Java.
– Inheritance is a mechanism in Java where one class inherits the properties and methods of another class. The class that inherits is called the subclass or derived class, and the class being inherited from is called the superclass or base class. Inheritance promotes code reusability and allows the subclass to extend or modify the functionality of the superclass.

7. What is the difference between abstract classes and interfaces?
– Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract method declarations.
– A class can extend only one abstract class, but it can implement multiple interfaces.
– Abstract classes can have instance variables, but interfaces cannot.

These are just a few sample questions to help you get started. Make sure to study the core concepts of Java thoroughly to perform well in your interview.Core java interview questions for freshers

 

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