I. Give the programs below:

public class ClassAClient

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

ClassA A$1=$ new ClassA $O$;

System.out.println$($A$1.$getxy$())$;

A$1.$ setx$(7)$;

A$1.$sety$(20)$;

System.out.println$($A$1.$getxy$())$;

System.out.println$("$The End"$)$;

$\}\}$

$//$without public modify, two classes can be in the same file

class ClassA $\{$

private int $x=9$;

private int $y=4$;

public ClassA $()\{\}$

public void setx $($int x $1)$

$x=x1$;