Question

Lesson is about Input validation, throwing exceptions, overriding toString

Here is what I am supposed to do in the JAVA Language: Model your code from the Time Class Case Study in Chapter 8 of Java How to Program, Late Objects (11^th Edition) by Dietel (except the displayTime method and the toUniversalString method).

• Use a default constructor.
• The set method will validate that the hourly employee’s rate of pay is not less than $15.00/hour and not greater than $30.00 and validate that the number of hours worked that week is positive but not greater than 80. If either of these are invalid, your code should throw an illegal argument exception that is caught and an appropriate message is printed stating the error. If the rate of pay and the hours worked are valid, the instance variables should be set.
• You will need to use a try/catch structure.
• Override the object’s toString method in the Hourly class so that the main method prints the object’s information (name and weekly pay) by its name only (i.e. System.out.println(objectname);). Be sure to make the output look nice.

Here is the Case Study Code to Model After:

public class Time1 {
   private int hour; // 0 - 23
   private int minute; // 0 - 59
   private int second; // 0 - 59

   // set a new time value using universal time; throw an
   // exception if the hour, minute or second is invalid
   public void setTime(int hour, int minute, int second) {
      // validate hour, minute and second
      if (hour < 0 || hour >= 24 || minute < 0 || minute >= 60 ||
         second < 0 || second >= 60) {
         throw new IllegalArgumentException(             
            "hour, minute and/or second was out of range");
      }

      this.hour = hour;
      this.minute = minute;
      this.second = second;
   }

   // convert to String in universal-time format (HH:MM:SS)
   public String toUniversalString() {
      return String.format("%02d:%02d:%02d", hour, minute, second);
   }

   // convert to String in standard-time format (H:MM:SS AM or PM)
   public String toString() {
      return String.format("%d:%02d:%02d %s",       
         ((hour == 0 || hour == 12) ? 12 : hour % 12),
         minute, second, (hour < 12 ? "AM" : "PM"));
   }
}

Grading Rubric
Description	Points
Corrected code from last assignment	5
Hourly Class validates hourly pay and hours worked correctly in a set method	3
Hourly Class correctly throws an IllegalArgumentException if either is not valid	3
Exception is caught (try/catch) and message is output to the user	3
toString method is overridden in Hourly Class	3
Main method prints object by its name only	3
UML of the Hourly class	5
Total	25

Answer 1

public class Hourly {

      

       // instance variables

       private String name;

       private double pay_rate;

       private int hours_worked;

      

       // default constructor

       public Hourly()

       {

             name="";

             pay_rate=0;

             hours_worked=0;

       }

      

       // method to set the hourly rate of pay and number of hours worked

       public void set(double pay_rate, int hours_worked)

       {

             // try-catch block to validate the pay_rate and hours_worked

             try {

                    // check if hourly employee’s rate of pay is not less than $15.00/hour and not greater than $30.00

                    // check if number of hours worked that week is positive but not greater than 80

                    if(pay_rate < 15 || pay_rate > 30 || hours_worked <= 0 || hours_worked > 80) // invalid

                           throw new IllegalArgumentException("Hourly rate of pay or number of hours worked was out of range"); // throw an exception

                   

                    // valid data

                    this.pay_rate = pay_rate;

                    this.hours_worked = hours_worked;

             }catch(IllegalArgumentException e)

             {

                    System.out.println(e.getMessage());

             }

       }

      

       // method to set the name

       public void setName(String name)

       {

             this.name = name;

       }

      

       // prints the object's information (name and weekly pay)

       public String toString()

       {

             return("Name : "+name+" Weekly pay : $"+String.format("%.2f", pay_rate*hours_worked));

       }

       public static void main(String[] args) {

             Hourly hourly = new Hourly();

             // set the name

             hourly.setName("John Smith");

             hourly.set(35, 60); // throw an exception

            

             hourly.set(18, 60); // valid data

             System.out.println(hourly);

       }

}

//end of program

Output: