Question

Course, Schedule, and ScheduleTester (100%)

Write a JAVA program that meets the following requirements:

Course Class

1. Create a class called Course. It will not have a main method; it is a business class.
2. Put in your documentation comments at the top. Be sure to include your name.
3. Course must have the following instance variables named as shown in the table:

Variable name	Description
crn	A unique number given each semester to a section (stands for Course Registration Number)
subject	A 4-letter abbreviation for the course (e.g., ITEC, PHED, CHEM)
number	A 4-digit number associated with the course (e.g., 1001, 1008, 0099). Note when selecting the data type: it is important to store 0099 instead of 99.
sectionId	A 2-digit number associated with a particular section of a course (e.g., 01, 13, 47)
creditHours	Number of credit hours the course is worth. Valid values are 0, 1, 2, 3, or 4. The default value is 3.
instructor	First and last name of the instructor teaching the course. If the instructor is not known, this should be listed as “TBA”
isAvailable	Value is either true or false based upon whether the course is available for registration. Default is false.

4. Create a constructor that has the crn, subject, number, and sectionId. Initialize the other instance variables based upon the default values in the table above.
5. Add a 7-argument constructor that uses all parameter variables to set the instance variables. Make sure your constructor calls the setters from #7, to ensure all data is validated. (All arguments will be of type String.)
6. Generate all the getters and setters
7. Changes to make to generated getters and setters to make sure data is valid:
   • public void setCrn(String input) – if input consists of all digits, convert input to integer. Use this integer to set the CRN. Otherwise, set the CRN to 9001 and display an error message that “Invalid value typed for CRN. Defaulting to 9001.”  
   • public void setNumber(String input) – if input consists of all digits and is in the range of 1 - 9999, convert input to integer. Use this integer to set the course number. Otherwise, set the course number to 1001 and display an error message that “Invalid value typed for course number. Defaulting to 1001.”  
   • public void setSectionId(String input) – if input consists of all digits and is in the range of 1 - 80, convert input to integer. Use this integer to set the section Id. Otherwise, set the section ID to 1 and display an error message that “Invalid value typed for section ID. Defaulting to 1.”  
   • public void setCreditHours(String input) – if input consists of all digits and is in the range of 0 - 4, convert input to integer. Use this integer to set the number of credit hours. Otherwise, set the credit hours to 3 and display an error message that “Invalid value typed for credit hours. Defaulting to 3.”  
   • public void setIsAvailable(String input) – if input starts with ‘t’, ‘T’, ‘y’, or ‘Y’, set Available to true. Otherwise, set isAvailable to false.
8. Create the toString method

ScheduleTester Class

1. Create a class called ScheduleTester. This is the only class that will have a main method in it.
2. Put in your documentation comments at the top. Be sure to include your name and your instructor’s name.
3. Inside the main method

• Construct a Course object named course1. Use the set methods to make sure it has valid information in it.
• Construct a Course object named course2. Use the set methods to make sure it has valid information in it.
• Construct a Course object named course3. Use the set methods to make sure it has valid information in it.
• SOP course1
• SOP course2

- SOP course3 Schedule

Answer 1

class Course
{
   /**
   author: Add your name here
   */

   private int crn;
   private String subject;
   private int number;
   private int sectionId;
   private int creditHours;
   private String instructor;
   private boolean isAvailable;

   Course(int crn, String subject, int number, int sectionId)
   {
       this.crn = crn;
       this.subject = subject;
       this.number = number;
       this.sectionId = sectionId;
       creditHours = 3;
       instructor = "TBA";
       isAvailable = false;
   }

   Course(String crn_val, String sub_val, String number_val, String sectionId_val, String creditHours_val,
           String instructor_val, String isAvailable_val)
   {
       setCrn(crn_val);
       setSubject(sub_val);
       setNumber(number_val);
       setSectionId(sectionId_val);
       setCreditHours(creditHours_val);
       setInstructor(instructor_val);
       setIsAvailable(isAvailable_val);
   }

   public int getCrn()
   {
       return crn;
   }

   public void setCrn(String input)
   {
       int flag = 0;
for (int i = 0; i < input.length(); i++)
   if (Character.isDigit(input.charAt(i)) == false)
   {
       flag = 1;
   }
if(flag == 1)
{
   crn = 9001;
   System.out.println(“ Invalid value typed for CRN. Defaulting to 9001. ”);
}
else if(flag == 0)
{
   this.crn = Integer.parseInt(input);
}

   }

   public String getSubject()
   {
       return subject;
   }

   public void setSubject(String input)
   {
       this.subject = input;
   }

   public int getNumber()
   {
       return number;
   }

   public void setNumber(String input)
   {
       int flag = 0;
for (int i = 0; i < input.length(); i++)
   if (Character.isDigit(input.charAt(i)) == false)
   {
       flag = 1;
   }
if(flag == 1)
{
   number = 1001;
   System.out.println(“ Invalid value typed for course number. Defaulting to 1001. ”);
}
else if(flag == 0)
{
   if(input>=1 || input<=9999)
       this.number = Integer.parseInt(input);
}
   }

   int getSectionId()
   {
       return sectionId;
   }

   public void setSectionId(String input)
   {
       int flag = 0;
for (int i = 0; i < input.length(); i++)
   if (Character.isDigit(input.charAt(i)) == false)
   {
       flag = 1;
   }
if(flag == 1)
{
   sectionId = 1;
   System.out.println(“ Invalid value typed for section ID. Defaulting to 1. ”);
}
else if(flag == 0)
{
   if(input>=1 || input<=80)
       this.sectionId = Integer.parseInt(input);
}
   }

   public int getCreditHours()
   {
       return creditHours;
   }

   public void setCreditHours(String input)
   {
       int flag = 0;
for (int i = 0; i < input.length(); i++)
   if (Character.isDigit(input.charAt(i)) == false)
   {
       flag = 1;
   }
if(flag == 1)
{
   creditHours = 3;
   System.out.println(“ Invalid value typed for credit hours. Defaulting to 3. ”);
}
else if(flag == 0)
{
   if(input>=0 || input<=4)
       this.creditHours = Integer.parseInt(input);
}
   }

   public String getInstructor()
   {
       return instructor;
   }

   public void setInstructor(String input)
   {
       this.instructor = input;
   }

   public boolean getIsAvailable()
   {
       return isAvailable;
   }

   public void setIsAvailable(String input)
   {
       if(input.charAt(0) == 't' || input.charAt(0) == 'T' || input.charAt(0) == 'y' || input.charAt(0) == 'Y')
           isAvailable = true;
      
       else
           isAvailable = false;
   }

public String toString()
{
return crn + " " + subject + " " + number + " " + sectionId + " " + creditHours + " " + instructor + " " + isAvailable;
}
}

class ScheduleTester
{
   /**
   Add your name and instructor's name here
   */
   public static void main(String[] args)
   {
       Course course1 = new Course(crn_val, sub_val, number_val, sectionId_val, creditHours_val, instructor_val, isAvailable_val);
       Course course2 = new Course(crn_val, sub_val, number_val, sectionId_val, creditHours_val, instructor_val, isAvailable_val);
       Course course3 = new Course(crn_val, sub_val, number_val, sectionId_val, creditHours_val, instructor_val, isAvailable_val);
       System.out.println(course1);
       System.out.println(course2);
       System.out.println(course3);
   }
}