Welcome To Our Website’s Basic Core JAVA Interview Questions With Short Answers Page! If You Are Preparing For A Job Interview That Involves Core JAVA, You Have Come To The Right Place.

Our Page Provides A Collection Of Frequently Asked Interview Questions Related To Core JAVA, Along With Concise And Straightforward Answers To Help You Prepare For Your Interview.

Core JAVA Interview Questions With Short Answers

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What is the difference between JDK and JRE?
Answer: JDK (Java Development Kit) is a software development kit that includes tools for developing Java applications, while JRE (Java Runtime Environment) is a runtime environment that enables Java programs to run on a computer.

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What is a constructor in Java?
Answer: A constructor is a special method used to initialize objects when they are created.

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What is the difference between an abstract class and an interface in Java?
Answer: An abstract class can have both abstract and non-abstract methods, while an interface can only have abstract methods.

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What is polymorphism in Java?
Answer: Polymorphism is the ability of an object to take on many forms, allowing different objects to respond to the same message or method call in different ways.

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What is an object in Java?
Answer: An object is an instance of a class that has its own state and behavior.

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What is an interface in Java?
Answer: An interface is a collection of abstract methods that define the behavior of a class.

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What is inheritance in Java?
Answer: Inheritance is a mechanism that allows a class to inherit the properties and methods of another class.

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What is encapsulation in Java?
Answer: Encapsulation is the mechanism of wrapping the data and methods that operate on the data within a single unit.

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What is abstraction in Java?
Answer: Abstraction is the process of hiding the implementation details and providing only the essential features to the user.

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What is a static method in Java?
Answer: A static method is a method that belongs to a class and can be called without creating an instance of the class.

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What is the purpose of the final keyword in Java?
Answer: The final keyword is used to make a variable, method, or class constant and unchangeable.

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What is the difference between public, private, and protected access modifiers in Java?
Answer: Public members can be accessed from anywhere, private members can only be accessed within the same class, and protected members can be accessed within the same package or subclass.

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What is the purpose of the main method in Java?
Answer: The main method is the entry point of a Java program and is where the program starts executing.

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What is a thread in Java?
Answer: A thread is a lightweight process that enables a program to perform multiple tasks concurrently.

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What is synchronization in Java?
Answer: Synchronization is a mechanism that allows multiple threads to access shared resources in a mutually exclusive manner to avoid data inconsistency.

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What is garbage collection in Java?
Answer: Garbage collection is a process that automatically frees up memory by removing objects that are no longer in use by the program.

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What is the difference between String and StringBuffer/StringBuilder?
Answer: String is an immutable object, while StringBuffer/StringBuilder are mutable objects that can be modified.

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What is the difference between == and equals() method in Java?
Answer: The == operator checks if two variables point to the same object, while the equals() method checks if two objects are equal in value.

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What is a package in Java?
Answer: A package is a group of related classes and interfaces that are organized together.

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What is the role of the JVM (Java Virtual Machine) in Java?
Answer: The JVM provides a runtime environment in which Java bytecode can be executed.

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Conclusion

Whether You Are A Beginner Or An Experienced In Core JAVA, Our Questions Cover A Wide Range Of Topics And Difficulty Levels To Suit Your Needs.

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