What will code output?class X $\{$

public int calculate$($int a$)\{$

return a $*2$;

$\}$

public int calculate$($int a$,$ int b$)\{$

return a $+$ b;

$\}$

$\}$

class Y extends X $\{$

public int calculate$($int a$)\{$

return a $+10$;

$\}$

$\}$

public class Test $\{$

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

X obj $=$ new Y$()$;

System.out.println$($obj$.$calculate$(3,4))$;

$\}$

$\}$