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JAVA 17 features

JAVA 17 features

Imagine being able to simplify complex logic with ease, enhance code security, and seamlessly integrate with native libraries. With Java 17, these possibilities become a reality, opening up a world of endless opportunities for developers.

Whether you're eager to boost your productivity, enhance your application's performance, or strengthen your codebase's integrity, Java 17 has something for everyone. So, grab your favorite coding tools, and let's dive into the exciting world of Java 17 and uncover its hidden treasures.

If you're a seasoned Java developer or just starting your coding adventure, this article is your ticket to discovering the exciting new capabilities of Java 17. From enhanced pattern matching to improved security measures, it is packed with advancements that will empower you to write cleaner, more efficient, and highly maintainable code.

From Older Problems to the New World of Java 17

Java 17 is the latest version of the Java programming language, released on September 14, 2022. It brings a host of new features and improvements that address some long-standing challenges in the Java programming language.

Here are some of the older problems that Java 17 resolves, ushering in a new world of possibilities:

Simplifying switch statements

Switch statements no longer need complicated if-else conditions. Java 17 adds switch pattern matching, which lets you use switch cases to handle different patterns in a clear and simple way. Say goodbye to complicated code and hello to switch pattern matching, which makes code easy to read and understand.

Enhanced control over class extensions

In older versions, it was hard to keep track of class extensions, which led to problems with class integrity and unneeded class structures. With Java 17, interfaces and classes that can't be changed save the day. Define a limited set of types that are allowed, and make sure your class structure is correct. Say hello to a system that is better organized and set up.

Improved vectorized operations

Do you often have trouble with less-than-ideal performance in jobs that require a lot of computing power because vectorized operations have their limits? The answer is in Java 17. Its Vector API has the answer. Use the features of the hardware and let the power of fast vectorized processes shine. Experience processes that are as fast as lightning and improve the speed of your program.

Enhanced interoperability

Bring Java and other languages like C and C++ closer together. The Foreign-Memory Access API was added to Java 17 to make it easier to use memory from different languages. By combining Java with other languages, you can broaden your views and try out new things.

Improved garbage collection

Garbage collection can be a pain, especially for apps that use a lot of memory and have a lot of big heaps. The Shenandoah trash collection comes with both concurrent and parallel methods and is part of Java 17. Say goodbye to long wait times and hello to more applications running at once. As your apps grow, your experience will get better and faster.

Top 10 Java 17 Features

1. Switch Pattern Matching

This is a powerful feature introduced in Java 17 that revolutionizes the way switch statements are written. It allows developers to use pattern matching within switch statements, making them more concise, readable, and expressive. Instead of writing multiple if-else conditions to match different patterns, you can now directly incorporate the patterns within the switch cases.

For example, consider a scenario where you have an enum representing different days of the week. In previous Java versions, you'd need to write separate if-else conditions for each enum value. But with switch pattern matching in Java 17, you can take a quantum leap forward:

With switch pattern matching, the switch statement directly matches the patterns of the enum values. No more repetitive conditions are needed. Your code becomes cleaner, more elegant, and easier to maintain.

But wait, there's more! Java 17 takes pattern matching to the next level with pattern matching, for instance, of checks. This powerful enhancement combines type-checking and casting into a single operation, saving you precious time and lines of code.

Before Java 17, we had to go through the hoops of explicit type-checking and casting:

But Java 17's pattern matching for instanceof simplifies everything:

if (shape instanceof Circle circle) {

   // Perform circle-specific operations using the 'circle' variable

} else if (shape instanceof Rectangle rectangle) {

   // Perform rectangle-specific operations using the 'rectangle' variable

} else if (shape instanceof Triangle triangle) {

   // Perform triangle-specific operations using the 'triangle' variable


By introducing the pattern variable (circle, rectangle, and triangle) within the instance of check, Java 17 eliminates the need for explicit casting. The code becomes more readable, more concise, and more efficient.

2. Sealed Classes and Interfaces

Java 17 introduces sealed classes and interfaces, which provide control over class or interface extensions. Sealed classes and interfaces restrict which other classes or interfaces can extend or implement them. This helps in ensuring the integrity of the class hierarchy and prevents unwanted extensions.

For example, let's say you have a Shape superclass and want to restrict the subclasses that can extend it. You can make the Shape class sealed and specify the permitted subclasses:

In this example, the Shape class is sealed, and only the classes Circle, Rectangle, and Triangle are permitted to extend it. Any other class attempting to extend Shape will result in a compilation error, ensuring better control over the class hierarchy.

3. Vector API

The Vector API introduced in Java 17 enables developers to perform vectorized operations on data, resulting in improved performance. It provides a set of vector types and associated operations that leverage the capabilities of modern hardware, such as SIMD (Single Instruction, Multiple Data) instructions.

For instance, if you have an array of numbers and you want to multiply each element by a scalar value, you can utilize the Vector API to achieve better performance:

import java.util.Arrays;

import java.util.Vector;

public class VectorExample {

   public static void main(String[] args) {

       double[] data = {1.0, 2.0, 3.0, 4.0};

       double scalar = 2.0;

       Vector<Double> vector = Vector.fromArray(data); -> e * scalar).toArray(data);




The Vector API allows you to efficiently process the elements in parallel, leveraging the capabilities of modern processors. This results in faster execution and improved performance for computations involving large datasets.

4. Foreign-Memory Access API

With Java 17, the Foreign-Memory Access API makes it possible for C and C++ programs to access memory from Java programs. This API is a bridge between Java and native languages, making it easy for them to work together and access memory quickly.

For example, say you have a native tool written in C that does complicated math. With the Foreign-Memory Access API, you can directly deal with the memory that the native library has set aside. This improves speed and cuts down on the time it takes to send and receive data.

In this example, the Foreign-Memory Access API is used to allocate native memory and interact with it using MemoryAddress. This enables efficient and direct memory access between Java and the native library.

5. Shenandoah Garbage Collector

The Shenandoah garbage collector, which was introduced in Java 17, is meant to be more efficient and scalable than the garbage collectors that came before it.

The Shenandoah garbage collection was made with one goal in mind: to cut down on those annoying pauses and boost the speed of your application. It's like giving large-scale apps and systems an extra push!

How does the magic of Shenandoah work? Using cutting-edge concurrent and parallel methods lets your program run smoothly while trash collection is happening. Say goodbye to those stressful times when screens froze up, and tools didn't work. With Shenandoah, your app stays active and fast even when it is cleaning up old data.

Shenandoah lets your application reach its full potential by cutting the time spent on garbage collection by a lot. It gives you the confidence to take on those resource-intensive jobs while keeping efficiency and response at their best.

6. Restore Always-Strict Floating-Point Semantics

For floating-point processes, Java 17 brings back always-strict floating-point semantics. This makes sure that Java works the same way on all computers and that it can be relied on. With this change, floating-point calculations will still be valid and accurate.

7. Strong Encapsulation for JDK Internals

Java 17 adds a new access-level API that makes it easier to hide JDK internals. This API lets developers wrap up internal JDK parts so they don't have to rely on features that aren't defined or aren't enabled.

By default, the internals of the JDK are hidden, and coders can't get to them. But in some situations where access to this internals is needed, developers can use the new API to safely access and use specific internal parts.

This improvement makes it easier to organize code, makes it less dependent on internal implementation details, and makes Java apps easier to manage in the long run.

8. New macOS Rendering Pipeline

Java 17 adds a new graphics pipeline for macOS, which replaces the old pipeline that is no longer supported. Apple's Metal technology is used to create graphics in the new system. This makes the graphics run faster, look better, and work better with macOS features.

By switching to a Metal-based workflow, Java apps that run on macOS will always be up-to-date with the newest graphics technologies and improvements, giving users a smoother and better experience.

9. macOS/AArch64 Port

Java 17 adds a version of the JDK to the macOS/AArch64 architecture. This lets apps run directly on those shiny Apple Silicon-based Macs.

Java 17 improves the speed of your apps on macOS devices by taking advantage of the unique features of the AArch64 platform. Now is the time to use all of the power of your Java code and see how fast it can run on Apple Silicon.

10. Deprecation of Applet API

By getting rid of the Applet API, Java 17 made a smart move. It used to be the best way to make web applets, but now safe and up-to-date online tools are taking over.

The Applet API should be put to rest now that there are options like Java Web Start, JavaFX, and the power of HTML5. Java 17 is in line with the changing web standards, which encourages developers to find better and more compatible ways to make web apps. It's all about staying ahead of the curve and welcoming the future!


The Java 17 has a lot of new features and changes that fix problems that have been around for a long time. Switch pattern matching simplifies code structure and makes it easier to read. Protected classes and interfaces give you more control over class groups and make sure the code is right.

The Foreign-Memory Access API makes it easy for software written in different languages to work together. The Vector API lets developers use hardware-specific features to speed up jobs that deal with a lot of data. Also, the Shenandoah trash collector makes garbage gathering faster and more flexible, which means there are fewer breaks and better application performance.

Unlock the full potential of Java 17 and stay ahead in the world of software development. Visit Cogent University and explore the wealth of information and insights available to you. Happy coding!

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