Which of the following code has the best style?

I:

public class Test $\{$

public static void main$($String$[]$ args$)\{$

System.out.println$("$Welcome to Java!"$)$;

$\}$

$\}$

II :

public class Test $\{$

public static void main$($String$[]$ args$)\{$

System.out.println$("$Welcome to Java!"$)$;

$\}$

$\}$

III:

public class Test $\{$

public static void main$($String$[]$ args$)\{$

System.out.println$("$Welcome to Java!"$)$;

$\}$

$\}$

IV:

public class Test $\{$

public static void main$($String$[]$ args$)\{$

System.out.println$("$Welcome to Java!"$)$;

$\}$

$\}$