Print Hello World

Every Java program needs a main method — it’s the entry point the JVM looks for when you run the class.

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

Try it yourself: change the text inside the quotes and re-run the program — you’ll see your own message printed instead.

Line by line

• public class Main — declares a class named Main. The file must be named Main.java.
• public static void main(String[] args) — the fixed signature the JVM calls to start your program.
• System.out.println(...) — writes text to standard output, followed by a newline.

A second example: printing several lines

public class Main {
    public static void main(String[] args) {
        System.out.println("Line one");
        System.out.println("Line two");
        System.out.print("No newline here, ");
        System.out.println("so this continues on the same line.");
    }
}

print does not add a trailing newline; println does — mix them when you want to build up a single line from multiple statements.