Features introduced in Java 9
Category : Java
| Sub Category : Java 9 introduced features | By Prasad Bonam Last updated: 2023-08-09 12:59:48
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Java 9 introduced several new features and enhancements to the Java programming language and platform. Here are some notable features introduced in Java 9:
Module System (Project Jigsaw): One of the most significant features in Java 9 is the introduction of the Java Platform Module System, also known as Project Jigsaw. This feature allows developers to create modular applications by encapsulating code and resources into distinct modules. It enhances encapsulation, improves security, and helps manage dependencies more effectively.
JShell (REPL): Java 9 introduced JShell, a Read-Eval-Print Loop (REPL) tool that allows developers to interactively experiment with Java code and expressions without the need for writing a complete program.
Factory Methods for Immutable Collections: Java 9 added static factory methods to create instances of immutable collections like List, Set, and Map. This makes it more concise and readable to create collections with initial values.
Private Interface Methods: Java 9 introduced the ability to have private methods in interfaces. This allows developers to organize code more effectively within interfaces without exposing unnecessary methods to implementing classes.
Stream API Enhancements: Java 9 added several methods to the Stream API, including
ofNullable, and others, making it more versatile and expressive for data manipulation.
Improved Process API: Java 9 introduced enhancements to the Process API, allowing better control and management of native processes, including the ability to obtain information about running processes and manage them.
Enhanced Deprecation: The
@Deprecated annotation received updates to provide more detailed information about why a particular API has been deprecated and what alternatives should be used.
HTTP/2 Client: Java 9 introduced a new HTTP client library that supports HTTP/2 and WebSocket, providing a more modern and flexible way to interact with HTTP-based services.
Multi-Release JAR Files: Java 9 introduced the concept of multi-release JAR files, allowing a single JAR file to contain different versions of classes for different Java releases. This facilitates backward compatibility while taking advantage of newer Java features.
New Methods in
Optional class, used for dealing with potentially null values, received new methods like
ifPresentOrElse, making it more convenient to handle optional values.
try-With-Resources: Java 9 extended the
try-with-resources statement to support effectively final variables, making the code cleaner and more concise.
Process API Updates for Controlling Operating System Processes: Java 9 introduced the
ProcessHandle API, which provides more control over and information about operating system processes.
These are some of the key features introduced in Java 9. Keep in mind that Java continues to evolve, and newer versions may have introduced additional features and enhancements beyond what is mentioned here.