Java 8 Programming Interview Questions


Java 8 Programming Interview Questions

Comprehensive Guide to Ace Your Interviews

Java 8 introduced several new features such as lambda expressions, functional interfaces, default and static methods in interfaces, streams, and new date and time APIs. As a result, Java 8 programming interview questions often focus on these concepts and their practical usage, as well as differences between Java 7 and Java 8. Employers may also ask about advantages of using lambda expressions, how stream API can improve performance, and how to handle null values with Optional class. It is important for candidates to have a clear understanding of these features and how they can be utilized in real-world scenarios.

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1 - What is the difference between immutable and mutable objects in Java?

Immutable objects cannot be modified once they are created, whereas mutable objects can be modified.

2) What is a lambda expression in Java?

A lambda expression is a concise way of representing a function that can be used as an argument or a variable.

3) What is the difference between a class and an interface in Java?

A class can have both abstract and non-abstract methods, while an interface can only have abstract methods.

4) What is the purpose of the “final” keyword in Java?

The “final” keyword can be used to make a variable, method, or class immutable.

5) What are the different types of inheritance in Java?

The different types of inheritance in Java are single, multi-level, hierarchical, and hybrid.

6) What is the difference between method overloading and method overriding?

Method overloading involves having multiple methods with the same name but different parameters, whereas method overriding involves redefining a parent class method in the child class.

7) What is a static method in Java?

A static method belongs to a class instead of an instance of that class and can be called without creating an object.

8) How can you handle exceptions in Java?

Exceptions can be handled by using try-catch blocks or by throwing exceptions to be handled by a higher level in the code.

9) What is the purpose of the “this” keyword in Java?

The “this” keyword is used to refer to the current instance of an object. It can also be used to invoke a class constructor from another constructor.

10) What is the difference between a StringBuffer and a StringBuilder in Java?

StringBuffer is thread-safe, whereas StringBuilder is not. This means that StringBuffer can be used in a multi-threaded environment without data corruption.

11) How can you achieve multithreading in Java?

Multithreading in Java can be achieved by extending the Thread class or implementing the Runnable interface.

12) What is autoboxing and unboxing in Java?

Autoboxing is the automatic conversion of a primitive data type into its corresponding wrapper class, while unboxing is the opposite, where the wrapper class is converted back into its primitive type.

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13) What is the purpose of the “super” keyword in Java?

The “super” keyword is used to call a superclass' constructor or access a superclass' member variables or methods from a subclass.

14) What is the difference between equals() and == in Java?

The equals() method compares the content of two objects, while the == operator compares their references.

15) How can you create a thread-safe collection in Java?

A thread-safe collection in Java can be created by using the synchronized keyword, or by using the collections in the java.util.concurrent package.


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