You are being given a class called UserSandD.java. This class is the same as the User class from problem 1, but it also implements the Serializable interface. Write a program called SerializeUserSandD.java that instantiates a UserSandD object and then saves a serialized copy of the object into a file called usersandd.ser on your hard drive. Write another program called DeserializeUserSandD.java that opens, reads and then deserializes the contents of the usersandd.ser file, and then prints out the username and password of the deserialized object on-screen. Examine the contents of the usersandd.ser file. See if you can interfere with the values of the attributes saved into it so that when you deserialize it the values are changed in the deserialized object in memory.

====This is UserSandD.java===

import java.io.Serializable;

public final class UserSandD implements Serializable { String username="n/a"; String password="n/a";

public UserSandD() { }

public UserSandD(String username, String password) { try { if (username==null || password==null) throw new IllegalArgumentException("Missing user data");

this.username=username; this.password=password; } catch (IllegalArgumentException e) { e.printStackTrace(); } }

public void setUsername(String username) { this.username=username; }

public void setPassword(String password) { this.password=password; }

public String getUsername() { return username; }

public String getPassword() { return password; }

public boolean validate(String username, String password) { boolean valid=false;

if (this.username.equals(username) && this.password.equals(password)) valid=true;

return valid; } }