public class Base

$\{$

public void method$1()$

$\{$

System.out.println$("$Base$")$;

$\}$

$\}$

class Sub extends Base

$\{$

public void method$1()$

$\{$

System.out.println$("$Sub$")$;

$\}$

$\}$

class Driver

$\{$

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

$\{$

Base b $=$ new Sub$()$;

Sub s $=$ new Sub$()$;

doIt$($b$)$;

doIt$($s$)$;

$\}$

public static void doIt$($ Base o$)$

$\{$

o$.$method$1()$;

$\}$

$\}$