For many decades, Java programmers have relied on the public static void main() method as the entry point for Java applications. However, Java 21 introduces a new feature that simplifies the coding process.

As you know, in Java, the main() method serves as the starting point for all programs. When a Java program is executed, the Java Virtual Machine (JVM) invokes the main() method to initiate the application.

class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}

Java 21 now offers a more streamlined approach to defining the entry point of your application, eliminating the need for public static void main(). This enhancement reduces boilerplate code and improves readability, making Java more accessible.

Syntax and Usage

In Java 21, you can write a Java program without explicitly defining the main method. Instead, you can place your executable code directly within the class body. Here’s an example:

public class HelloWorld {
    static {
        System.out.println("Hello World!");
    }
}

Prior to Java 21, although static blocks existed, the main method was still required to start the application. With Java 21, this is no longer necessary.