Overriding the add method

public class Calculator$\{$

private int num$1$;

private int num$2$;

public Calculator$()$

$\{$

num$1=0$;

num$2=0$;

$\}$

public int add$()$

$\{$

return num$1+$num$2$;

$\}$

public int add$($int num$1,$int num$2)$

$\{$

return num$1+$ num$2+1$;

$\}$

public int add$()$

$\{$

return num$1+$ num$2*3$

$\}$

public int add$($int num$1,$ int num$2)$

$\{$

return num$1+$ num$2$;

$\}$