Java 8 Interview Questions
Top Java 8 Interview Questions to Ace Your Interview
Java 8 Interview Questions
Sure! Java 8 introduced several important features such as lambda expressions, functional interfaces, stream API, and default methods in interfaces. Some common Java 8 interview questions include explaining the difference between lambda expressions and anonymous classes, demonstrating the usage of stream API for data processing, defining the concept of Functional Interfaces, showcasing the benefits of default methods in interfaces, and discussing the advantages of using Java 8 features in real-world applications for better performance and readability of the code.
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1 - What are the key features of Java 8?
Java 8 introduced several new features, including Lambda Expressions, Stream API, default methods in interfaces, and the new Date and Time API. Lambda expressions enable functional programming in Java by allowing the use of functions as method arguments. The Stream API provides a more efficient and functional way to work with collections and perform operations such as filtering, mapping, and reducing. Default methods in interfaces allow interfaces to have concrete methods, reducing the need for abstract classes. The new Date and Time API brings improvements over the legacy java.util.Date and java.util.Calendar classes.
2) What is a Lambda Expression in Java 8?
A Lambda Expression is a concise way to represent a method that can be treated as an object. It consists of parameters, a lambda operator ( >), and a body. Lambda expressions enable functional programming in Java by allowing the passing of functions as arguments to methods, thus promoting code reusability and more readable code.
3) Explain the Stream API in Java 8.
The Stream API in Java 8 provides a functional way to iterate, filter, map, and reduce elements in a collection. Streams enable developers to write more declarative and expressive code by allowing operations to be chained together, leading to more concise and readable code. Streams are processed in a lazy manner, improving performance by executing operations only when necessary.
4) What are default methods in interfaces in Java 8?
Default methods in interfaces are a new feature introduced in Java 8 that allows interfaces to have concrete methods. This addition was made to provide backward compatibility for interfaces when new methods need to be added without breaking existing implementations. Default methods provide a way to extend the functionality of interfaces without forcing all implementing classes to provide an implementation.
5) What is the Date and Time API in Java 8?
The Date and Time API in Java 8 provides a more comprehensive and flexible way to work with dates and times. It includes classes like LocalDate, LocalTime, LocalDateTime, ZonedDateTime, and Duration, which offer better support for date and time operations compared to the old java.util.Date and java.util.Calendar classes. The new API also addresses the shortcomings of the legacy classes, such as immutability, null safety, and time zone support.
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