Java 8 Interview Questions And Answers
The Ultimate Guide to Answering Java 8 Interview Questions
Java 8 is the latest release of the Java programming language, which introduced several new features such as lambda expressions, functional interfaces, and streams. These features have greatly enhanced the language's capabilities and opened up new possibilities for creating more concise and efficient code. Understanding these features is crucial for any Java developer, and being able to answer related interview questions can demonstrate a strong grasp of the language and its advancements.
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1 - What is Java 8?
Java 8 is the eighth major release of the Java programming language, which was released in 2014. It introduced significant changes and new features, making Java more efficient, user-friendly, and versatile.
2) What are the new features introduced in Java 8?
Some of the key features introduced in Java 8 include lambdas, streams, default methods in interfaces, functional interfaces, and the new Date and Time API.
3) What is a lambda expression?
Lambda expressions are anonymous functions that can be passed around like any other method parameter. They allow developers to write more concise and elegant code by reducing the amount of boilerplate code.
4) What is a stream in Java 8?
A stream is a sequence of data elements that can be processed in a functional way (i.e. using methods like map, filter, reduce). It allows for efficient and convenient operations on large data sets.
5) What are functional interfaces?
Functional interfaces are interfaces with only one abstract method and can be used as the assignment target for lambda expressions. Java 8 provides a functional interface annotation @FunctionalInterface to explicitly mark an interface as a functional interface.
6) What are the benefits of using default methods in interfaces?
Default methods allow for the addition of new functionality to an interface without breaking the existing code. It also provides a way for multiple inheritance in interfaces.
7) What is the new Date and Time API in Java 8?
Java 8 introduced the java.time package, which provides a more comprehensive and intuitive set of classes for representing dates, times, and durations. It addresses the shortcomings of the old java.util.Date and java.util.Calendar classes.
8) How have Java 8 streams improved performance?
Java 8 streams provide internal iteration, which means that the elements are processed in parallel, allowing for faster and more efficient processing of large data sets.
9) What are method references in Java 8?
Method references allow for the reference to an existing method by using the double colon (::) operator instead of passing a lambda expression. It makes the code more concise and readable.
10) How does Java 8 support functional programming?
Java 8 introduces functional programming concepts like lambda expressions, streams, and functional interfaces, which make it possible to write clean, concise, and scalable code.
11) Can you explain the concept of Optional in Java 8?
Optional is a new container class in Java 8 that is used to represent an object that may or may not be present. It avoids the problem of NullPointerException and enables writing more robust code.
12) How has Java 8 improved parallel programming?
Java 8 provides improved support for parallel programming with features like streams, lambda expressions, and functional interfaces, which make it easier to write parallel code without the risk of race conditions.
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13) What are the advantages of using Java 8 over previous versions?
Java 8 offers significant improvements in terms of performance, concurrency, and modularity. It also introduces new features like lambda expressions, streams, and functional interfaces, making it more efficient and versatile.
14) How does Java 8 simplify coding?
With features like lambda expressions and method references, Java 8 allows developers to write more concise and readable code, reducing the need for boilerplate code and making coding more efficient.
15) What is the purpose of the Java 8 try-with-resources statement?
The try-with-resources statement in Java 8 is used to automatically close resources that are opened within its block. It simplifies the code and avoids the risk of resource leaks.
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