Explain public static void main(String[] args)

Each keyword has a job:

• public — the launcher, which is outside your class, must be able to call it.
• static — the JVM calls it without creating an object of the class first.
• void — it returns nothing; to report a status, call System.exit(code).
• main — the name the launcher looks for.
• String[] args — the command-line arguments (String... args also works).

public class Greet {
    public static void main(String[] args) {
        String who = args.length > 0 ? args[0] : "world";
        System.out.println("Hello, " + who);
    }
}
// java Greet Asha  ->  Hello, Asha

Without static, the class still compiles. On Java 8–24 the launcher then refuses to run it ("Main method is not static…"). Java 25 made instance main methods a standard feature, so there the launcher creates an object and calls the non-static main. Interviewers usually expect the classic answer, so give it first and mention the Java 25 change as a bonus.