Note: Please ensure that the social security numbers use the following digit pat
ID: 3838694 • Letter: N
Question
Note: Please ensure that the social security numbers use the following digit pattern for the first output line which is 000-00-000. Basicaly three digits, two digits and three digits again.
Introduction:
In this lab, you will be creating your own exception class. You will also create a class that will use the exception class in its constructor and set methods and a driver program that will demonstrate how the exception can be handled. Note: In this lab, you will be creating all classes from scratch so there are no files template files
Note: Please ensure that the social security numbers use the following digit pattern for the first output line which is 000-00-000. Basicaly three digits, two digits and three digits again.
Problem 1.
Create an exception class called SSNFormatException that extends Exception. Include four constructors for the class as described in your
book. One with no arguments, one with a String argument, one with a String and a Throwable argument and one with a Throwable argument. The latter two could be used for chaining exceptions. All the constructors should be calling the respective super class constructor giving at least a String argument to it.
Problem 2.
Create a new class called Employee. The class should contain 3 instance variables,firstName,lastNameandsocialSecurityNumber of type String. It should have at least a no argument and a three argument constructor and respective set and get methods for the three instance variables. The 3 argument constructor and the setSocialSecurityNumber method should validate that the Social Security Number provided as a String parameter is well formed and throw a SSNFormatException if it is not. According to good programming practices, the constructor and the setSocialSecurityNumber method should call a static method called testSSN that takes a String as argument and throws a SSNFormatException if the String is not well formed.
The static testSSN method checks for the following errors:
Number of characters not equal to 11. (Just check the length of the
string).
Dashes in the wrong spots.
Any non-digits exist in the non-dash spots of the SSN.
[Hint:] Use a loop to step through each character of the string, checking for a digit or hyphen in the appropriate spots.
Problem 3.
Create a test application that demonstrates the use of your class and its methods. In particular the main method of your test app, should contain a try-catch statement. This statement tries to create a new employee using a firstName, lastName and SSN provided by the user. If the social security number is invalid a SSNFormatException will be thrown from the constructor. It should catch it and print out the name and social security number entered, and an associated error message indicating why the social security number is invalid. In order to be able to understand why the SSN is invalid, this message should be retrieved from the SSNFormatException. As a result it should be the testSSN method that produces messages that describe what kind of format error is encountered in the SSN, and provides these messages to the constructor of the SSNFormatException as it throws the exception. A loop should be used to allow the user to continue inserting employees until the user indicates that they do not want to continue.
Sample output.
Insert Employee Last Name: Washington
Explanation / Answer
Below is the required code for the question. Output also is shown. Please don't forget to rate the answer if it helped. Thank you very much.
SSNFormatException.java
public class SSNFormatException extends Exception {
public SSNFormatException()
{
super("Invalid SSN Format");
}
public SSNFormatException(String msg)
{
super(msg);
}
public SSNFormatException(String msg, Throwable t)
{
super(msg,t);
}
public SSNFormatException(Throwable t)
{
super("Invalid SSN format", t);
}
}
Employee.java
public class Employee {
private String firstName, lastName, socialSecurityNumber;
//default constructor
Employee()
{
firstName = lastName = socialSecurityNumber ="";
}
//parameterizied constructor
Employee(String fname, String lname, String ssn) throws SSNFormatException
{
firstName = fname;
lastName = lname;
if(testSSN(ssn))
socialSecurityNumber = ssn;
}
private static boolean testSSN(String ssn) throws SSNFormatException
{
if(ssn.length() != 11)
throw new SSNFormatException("Invalid the social security number, wrong number of characters");
else
{
for(int i=0;i<11;i++)
{
if(i==3 || i==6 ) //position for dashes
{
if(ssn.charAt(i)!='-')
throw new SSNFormatException("Invalid the social security number, dashes at wrong positions");
}
else //digit positions
{
if(!Character.isDigit(ssn.charAt(i))) //not a digit
throw new SSNFormatException("Invalid the social security number, contains a character that is not a digit");
}
}
}
return true;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getSocialSecurityNumber() {
return socialSecurityNumber;
}
public void setSocialSecurityNumber(String socialSecurityNumber) throws SSNFormatException {
if(testSSN(socialSecurityNumber))
this.socialSecurityNumber = socialSecurityNumber;
}
}
TestSSN.java
import java.util.Scanner;
public class TestSSN {
public static void main(String[] args) {
String ans;
Scanner scanner=new Scanner(System.in);
Employee e;
String fname, lname, ssn;
do
{
System.out.print(" Insert Employee First Name: ");
fname = scanner.next();
System.out.print(" Insert Employee Last Name: ");
lname = scanner.next();
System.out.print(" Insert Employee SSN: ");
ssn = scanner.next();
try {
e = new Employee(fname, lname, ssn);
System.out.println("Employee created successfully.");
} catch (SSNFormatException ex) {
System.out.println(ex.getMessage());
}
System.out.print(" Continue ? ");
ans = scanner.next();
}while(ans.equalsIgnoreCase("y"));
}
}
output
Insert Employee First Name: Sam
Insert Employee Last Name: Sly
Insert Employee SSN: 333-00-999
Invalid the social security number, wrong number of characters
Continue ? y
Insert Employee First Name: George
Insert Employee Last Name: Washington
Insert Employee SSN: 123-45-6789
Employee created successfully.
Continue ? y
Insert Employee First Name: Jane
Insert Employee Last Name: Doe
Insert Employee SSN: 222-00-999o
Invalid the social security number, contains a character that is not a digit
Continue ? y
Insert Employee First Name: Harry
Insert Employee Last Name: Potter
Insert Employee SSN: 333-333-333
Invalid the social security number, dashes at wrong positions
Continue ? n
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