Explain in detail each step of the following SQLJ code

import java.sql$.*$;

$/**$

This is what you have to do in SQLJ

$**/$

public class SimpleDemoSQLJ $//$ line $6$

$\{$

$//$TO DO: make a main that calls this

public Address getEmployeeAddress$($int empno$)//$ line $10$

throws SQLException

$\{$

Address addr; $//$ line $13$

#sql $\{$ SELECT office$\_$addr INTO :addr FROM employees

WHERE empnumber $=$ :empno $\}$;

return addr;

$\}$

$//$ line $18$

public Address updateAddress$($Address addr$)$

throws SQLException

$\{$

#sql addr $=\{$ VALUES$($UPDATE$\_$ADDRESS$($:addr$))\}$; $//$ line $22$

return addr;

$\}$

$\}$