Java is a widely used programming language, and employers often require applicants to have strong Java skills. Therefore, job seekers need to be prepared for Java-related interview questions. Here are some common Java interview questions that you may encounter:

What is Java?

This is a fundamental question that tests your basic knowledge of the language. Java is a high-level, class-based, object-oriented programming language that is designed to be portable and platform-independent.

What is the difference between an abstract class and an interface in Java?

An abstract class is a class that cannot be instantiated, while an interface is a collection of abstract methods that can be implemented by any class. In other words, an interface provides a blueprint for a class to follow, while an abstract class serves as a base class for its subclasses.

What is the difference between a private and a protected method in Java?

A private method can only be accessed within the same class, while a protected method can be accessed within the same class and any subclass of that class.

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What is the difference between a HashMap and a TreeMap in Java?

A HashMap is an unordered collection of key-value pairs, while a TreeMap is a sorted map implementation. HashMap provides constant-time performance for basic operations, such as get and put, while TreeMap provides log(n) time performance.

What is the difference between a checked and an unchecked exception in Java?

A checked exception is a type of exception that must be handled in the code, either by catching the exception or by declaring it in the method signature using the throws keyword. An unchecked exception is a type of exception that does not need to be handled explicitly in the code.

What is the difference between a class and an object in Java?

A class is a blueprint for creating objects, while an object is an instance of a class. In other words, a class is a template, and an object is the actual implementation of that template.

What is polymorphism in Java?

Polymorphism is the ability of an object to take on many forms. In Java, polymorphism is achieved through method overriding and method overloading.

What is the difference between method overloading and method overriding in Java?

Method overloading is when two or more methods in a class have the same name but different parameters. Method overriding is when a subclass provides a specific implementation of a method that is already defined in its superclass.

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What is the difference between static and non-static methods in Java?

A static method is a method that belongs to the class itself and not to any instance of the class, while a non-static method is a method that belongs to an instance of the class.

What is a thread in Java?

A thread is a lightweight unit of execution that can run concurrently with other threads. In Java, threads are used to perform multiple tasks simultaneously.

In addition to these questions, you may also be asked to write code to solve a specific problem or to explain a concept in more detail. It is essential to prepare for Java interview questions by reviewing the language's key features, such as object-oriented programming, data types, control structures, and exception handling. It is also helpful to practice writing Java code to become familiar with the language's syntax and to improve your problem-solving skills.

In summary, Java interview questions cover a wide range of topics, from basic language features to more advanced concepts such as polymorphism and concurrency. Employers want to ensure that job applicants have a solid understanding of the language's key features and can apply them to solve real-world problems. Therefore, it is crucial to be prepared for Java interview questions by reviewing the language's key concepts, practicing writing code, and developing strong problem-solving skills.

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