This article provides a comprehensive overview of Java 8’s key features through a series of top multiple-choice questions (MCQs). It covers fundamental concepts like lambda expressions and functional interfaces, as well as advanced topics such as CompletableFutures, parallel streams, and method references. Whether you’re a seasoned Java developer looking to sharpen your skills or someone exploring the world of Java for the first time, these MCQs will help you grasp the essence of Java 8 and its capabilities, making you a more proficient and confident Java programmer.
Java 8, released in 2014, marked a significant milestone in the evolution of the Java programming language. It introduced a wide array of features and enhancements that transformed the way developers write Java code. From the introduction of lambda expressions and functional interfaces to the powerful Streams API and the modern Date and Time API, Java 8 brought functional programming and improved data manipulation capabilities to the language.
1.) What is the primary purpose of lambda expressions in Java?
2.) Which annotation is used to define a functional interface in Java?
3.) What is the purpose of default methods in Java interfaces?
4.) Which Java package provides the Streams API for collection manipulation?
5.) What is the purpose of method references in Java?
6.) Which functional interface represents a function that takes no arguments and returns no result?
7.) What is the primary advantage of the Optional class in Java 8?
8.) In Java 8, which package contains the modern Date and Time API?
9.) Which JavaScript engine was introduced in Java 8 for improved performance?
10.) What is the primary use of CompletableFuture in Java 8?