Interview Questions On Java 8


Interview Questions On Java 8

Top 10 Common Interview Questions on Java 8

Interview questions on Java 8 can cover a wide range of topics including new features introduced in Java 8 like lambdas, streams, functional interfaces, and default methods. These questions can assess a candidate's understanding of functional programming concepts, usage of new APIs, and their ability to write concise and efficient code using Java 8 features. Some common topics that may be covered in these questions include method referencing, optional type, parallel streams, and differences between imperative and functional programming. Employers may also ask candidates to explain real-life use cases for Java 8 features and their benefits. Overall, these questions aim to gauge a candidate's proficiency in using the latest version of Java and their ability to apply it in their development tasks.

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1 - What is Java 8?

Java 8 is a major release of the Java programming language which was introduced in 2014. It introduced new features such as functional programming, lambda expressions, method references, and optional class.

2) What are the main features of Java 8?

The main features of Java 8 include lambda expressions, functional interfaces, streams, default methods, method references, and the Java Time API.

3) What are lambda expressions?

Lambda expressions are anonymous functions that allow you to treat functionality as method argument, or code as data.

4) How are lambda expressions used in Java 8?

In Java 8, lambda expressions are used to implement functional interfaces, which are interfaces that have exactly one abstract method. They also make use of the newly introduced functional interfaces such as Consumer, Supplier, Function, and Predicate.

5) What is a functional interface?

A functional interface is an interface that has only one abstract method and can be used as the target for a lambda expression. Java 8 introduces the @FunctionalInterface annotation for explicitly marking interfaces as functional.

6) What are streams in Java 8?

Streams are a new way of handling collections in Java 8. They allow for efficient processing of large amounts of data by providing a set of operations such as filter, map and reduce.

7) How are streams used in Java 8?

Streams are used to perform aggregate operations on collections, using lambda expressions as arguments. These operations include filtering, sorting, and mapping of elements.

8) What are default methods in Java 8?

Default methods are methods defined within an interface that have an implementation, unlike the traditional interface methods which are abstract and do not have an implementation.

9) How do default methods affect existing interfaces in Java 8?

Default methods allow for adding new methods to existing interfaces without affecting the classes that implement them. This makes it easier to evolve APIs without breaking existing code.

10) What are method references?

Method references allow you to pass a method as an argument to another method. They can be seen as a shorthand for lambda expressions.

11) What are the advantages of using method references?

Method references can improve code readability and also reduce code duplication, leading to easier maintenance of code.

12) What is the Java Time API?

The Java Time API is a modern API for handling dates, times, and timezones, introduced in Java 8 to replace the previously used Date and Calendar classes.

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13) How does Java 8 improve performance?

Java 8 introduces the concept of parallel streams which allows for the concurrent processing of streams, improving performance for operations on large collections.

14) How does Java 8 support functional programming?

Java 8 supports functional programming by introducing lambda expressions and streams, which allow for a more declarative and concise coding style.

15) What is the compatibility of Java 8 with previous versions?

Java 8 maintains backward compatibility with previous versions, allowing for the smooth transition of existing code. However, developers need to ensure that they are using new APIs and features correctly to avoid any potential compatibility issues.


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