Java : Call main method before JVM Call

Static blocks are also called Static initialization blocks . A static initialization block is a normal block of code enclosed in braces, { }, and preceded by the static keyword. Here is an example:

static {
    // whatever code is needed for initialization goes here
}

 

A class can have any number of static initialization blocks, and they can appear anywhere in the class body. The runtime system guarantees that static initialization blocks are called in the order that they appear in the source code. 

 

And dont forget, this code will be executed when JVM loads the class. JVM combines all these blocks into one single static block and then executes. Here are a couple of points I like to mention:

public class Test {

    static {
        Test.main("From static Block");
    }

    public static void main(String... args) {
        if (args.length > 0) {
            System.out.println(args[0]);
        } else {
            System.out.println("By JVM");
        }
    }
}