Java 23 features | What's new in Java 23 |Interview Questions and Answers | Code Decode

In this video of code decode we are going to learn about new features of Java 23 and
what are we going to release in java 23

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Before digging deeper into new features that come up with java 23, lets see *what are the Preview / second preview and third preview.*



In the context of Java features, "preview" refers to features that are introduced in a version of Java but are not yet finalized. These features are included for developers to experiment with and provide feedback on. They may change based on user input and further development before being finalized in a future release.



In Java, features introduced as "preview" can go through multiple stages before becoming finalized. Here's a breakdown of what the first, second, and third preview features typically mean:

1. **First Preview**: This is the **initial introduction **of a feature in a particular Java release. It allows developers to use and test the feature in real-world applications. The purpose is to gather feedback and identify any issues or improvements needed.
2. *Second Preview**: If a feature receives positive feedback and shows promise, it may be revisited in a subsequent release as a second preview. This stage often includes **refinements based on the feedback* from the first preview, and it may introduce some changes to the API or behavior of the feature.
3. **Third Preview**: A feature may go through a third preview phase if further adjustments are deemed necessary. This allows for more feedback and iteration before the feature is finalized. By this stage, **the feature is typically more stable and closer to its final form**, but it can still be subject to change.
Each preview phase is designed to encourage community involvement and ensure the feature aligns with Java's overall design principles.





*Q) Also what are these numbers- 455, 466 and so on*

The numbers you see (like 455, 466, 467, etc.) refer to the *JEP (JDK Enhancement Proposal)* identifiers assigned to specific features or enhancements in the Java Development Kit (JDK). Each JEP number represents a proposal that outlines a particular change or addition to the Java platform, including its purpose, design, and implementation details.



*1. JEP 455: Primitive Types in Patterns, **`**instanceof**`**, and **`**switch**`* (Preview)**

**Before**: In Java, pattern matching has been evolving for some time. For instance, using pattern matching with `instanceof` allows checking if an object is of a certain type and then casting it directly in one step. But this did not work for primitive types.



**Now**: With this JEP, you can perform pattern matching for primitive types in `instanceof` and `switch` statements. This simplifies the code when dealing with primitive values, enhancing readability and reducing boilerplate. This is a preview feature (Java 21).


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