Exercise 6 – Exceptions solution

Description

Exercise 6 – Exceptions Due in the lab period of week 11 Steps: • Create a new project in Eclipse • Add three classes: 1. FullNameException 2. Person 3. PersonTester Class Details: 1. Class FullNameException • This should inherit from class java.lang.Exception • It should contain 4 overloaded constructors: o No Parameter: use the super class constructor to set the message to “Full name not correct format” o String Parameter: use the super class constructor to set the message passed in via the parameter o String and Throwable parameters: use the super class constructor to set the message and throwable passed in via the parameters o Throwable Parameter: use the super class constructor to set the throwable that was passed via the parameter 2. Class Person • One field: fullName as String • A getter and setter for fullName • A constructor that sets fullName to “unknown” • A private method called validateData that takes one parameter a String • Inside the validateData method throw a FullNameException with an appropriate message for the following rules: o The String cannot be null o The String cannot have a length of zero o The String cannot consist of only white space  Tip: think about using trim() and length() on your String object o The String cannot have a length exceeding 20 characters o The String cannot contain a comma  Tip: there might be a method within String you can use, check the API • “might” meaning at least two methods that can be used** • You will need to add throws FullNameException to two of your methods. 3. PersonTester • Use the code provided to test your other classes. ** Bonus of 2 marks if you figure out two methods of class String that can locate a comma, and demonstrate them in your program.
Person Tester:
public class PersonTester { public static void main(String[] args){ try{ Person p = new Person(); // name set to “Unknown” by default // as you test each call, which triggers an exception, // comment it out and re-run the program to test the // next case. p.setFullName(null); // null p.setFullName(“”); // empty String p.setFullName(” “); // white space p.setFullName(“12345678901234567890tuna”); // length 20 p.setFullName(“fish, tuna”); // contains comma } catch(FullNameException ex){ System.out.println(ex.getMessage()); } }
} Grading Guide (Total Score 10): FullNameException coded correctly? 3 Person class has requested field, methods and constructor? 3 Person class members are marked with throws FullNameException where appropriate? 2 Program produces correct output 2 Bonus? 2 Expected Total 10 Sample Program Output Test run 1: null Full name cannot be empty or null Test run 2: empty String Full name cannot be empty or null Test run 3: whitespace only Full name cannot be empty or null Test run 4: length 20 Full name cannot exceed 50 characters Test run 5: containing comma Full name cannot contain a comma