Exploring the New Java 22 Feature: Implicit Classes and Instance Main Methods

In Java 22, a new feature named "Implicit Classes and Instance Main Methods" (JEP 463) has been introduced. This feature is currently in the second preview phase, which means it is available for testing and feedback but not yet finalized for standard use.

With this feature, the process of coding in Java becomes significantly simplified. Developers no longer need to explicitly define a public class in order to write and execute Java code. This streamlines the main method structure, where the traditional format of passing String[] args as an argument is no longer necessary.

Thanks to this feature, programmers can start writing executable code directly without any additional steps. This not only enhances ease of use, but also reduces the amount of boilerplate code, making the codebase cleaner and easier to understand.

One of the major benefits of this feature is its impact on newcomers to Java programming. The simplified coding process is less confusing and overwhelming for beginners, making it easier for them to learn and adopt the language.

Main.java

public static void main() {
    System.out.println("Hello "+greeting());
}

static String greeting() {
    return "from implicit classes and instance main methods!";
}

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In this code, we can see that no class has been defined, and the String[] args argument is also absent in the main method. Yet, when we run this program, it executes without any errors.
To enable this feature, we need to include the --enable-preview option and specify --source 22 to ensure compatibility with Java 22. This allows us to explore and test out the latest updates without having to wait for them to become officially released.

The output of this program would be:
Hello from implicit classes and instance main methods!
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In conclusion, Java's new feature of "Implicit Classes and Instance Main Methods" greatly simplifies the coding process, making it more accessible for beginners and streamlining the main method structure. With this new addition, Java becomes even more user-friendly and efficient for developers.

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