Book Image

Learn Java 17 Programming - Second Edition

By : Nick Samoylov
4 (1)
Book Image

Learn Java 17 Programming - Second Edition

4 (1)
By: Nick Samoylov

Overview of this book

Java is one of the most preferred languages among developers. It is used in everything right from smartphones and game consoles to even supercomputers, and its new features simply add to the richness of the language. This book on Java programming begins by helping you learn how to install the Java Development Kit. You’ll then focus on understanding object-oriented programming (OOP), with exclusive insights into concepts such as abstraction, encapsulation, inheritance, and polymorphism, which will help you when programming for real-world apps. Next, you’ll cover fundamental programming structures of Java such as data structures and algorithms that will serve as the building blocks for your apps with the help of sample programs and practice examples. You’ll also delve into core programming topics that will assist you with error handling, debugging, and testing your apps. As you progress, you’ll move on to advanced topics such as Java libraries, database management, and network programming and also build a sample project to help you understand the applications of these concepts. By the end of this Java book, you’ll not only have become well-versed with Java 17 but also gained a perspective into the future of this language and have the skills to code efficiently with best practices.
Table of Contents (23 chapters)
1
Part 1: Overview of Java Programming
5
Part 2: Building Blocks of Java
15
Part 3: Advanced Java

Stream initialization

There are many ways to create and initialize a stream – an object of type Stream or any of the numeric interfaces. We grouped them by classes and interfaces that have stream-creating methods. We did it for your convenience so that it would be easier for you to remember and find them if need be.

Stream interface

This group of Stream factories is composed of static methods that belong to the Stream interface.

empty()

The Stream<T> empty() method creates an empty stream that does not emit any element:

Stream.empty().forEach(System.out::println);   //prints nothing

The forEach() Stream method acts similarly to the forEach() Collection method and applies the passed-in function to each of the stream elements:

new ArrayList().forEach(System.out::println);  //prints nothing

The result is the same as creating a stream from an empty collection:

new ArrayList().stream().forEach(System.out::println); ...