Specialisation

[Sage25]

Hi Guys,

I am doing an assignment which entails completing partially completed code i have been given and implementing a GUI front end.

I have 6 classes:
School
Person - abstract class which superclasses- Student, Lecturer, HeadOfSchool
HeadOfSchool - extends Lecturer
Student - extends Person
Lecturer - extends Person
Course

The application simulates a part of the University, Therefore i am required to read in data from a file.
Here is the data format:

Name of school
Details of the Head of School
Number of Lecturers
List of Lecturers
Name of course1, number of students
List of Students
Name of course2, number of students
List of Students
Name of course2, number of students
List of Students
Name of course3, number of students
List of Students

School of Computing
Prof Shirley Campbell,Aberdeen,female,45,45000
8
Dr John Smith,Aberdeen,male,40,28000
Dr Joan Simpson,Aberdeen,female,30,27500
Mr Tony Orlando,Banchory,male,40,27500
Dr Craig Stuart,Aberdeen,male,38,18500
Dr Moira Cables,Aberdeen,female,35,22500
Dr William Green,Aberdeen,male,38,35500
Mr Henry Brown,Aberdeen,male,37,27265
Ms Jill Blossom,Aberdeen,female,48,30000
Course UG1,4
Alan Smith,Aberdeen,male,35,A
Mary Grant,Banchory,female,25,B
Joe Bloggs,Aberdeen,male,42,A
Jack Hawkins,Stonehaven,male,30,C
Course UG2,5
Susan Clark,Aberdeen,female,18,C
Carol Roberts,Murcar,female,32,B
Roy Rogers,Ellon,male,37,B
Melanie Sykes,Murcar,female,22,A
Colin Firth,Aberdeen,male,27,A
Course UG3,3
Cindy Lauper,Aberdeen,female,27,A
Jim Bowen,Banchory,male,47,C
Andy Townsend,Arbroath,male,35,B

I have managed to read in the school name,details of Head of School and number of lecturers. The problem i am having is reading in the lecturers. Within the HeadOfSchool class there is an attribute which is an array of lecturer objects. But the constructor has no array of lecturer objects param. Advice please? Sorry if i havent been very informative, having trouble understanding whats going on in my head ha

[Sage25]

What i am trying to say is... i can read in all the lecturers from the file and assign them to an array of Lecturer type. But what i dont know is, where i assign the object array to?

[PhHein]

Within the HeadOfSchool class there is an attribute which is an array of lecturer objects.

That makes no sense, a HeadOfSchool hasn't got any lecturers, but a school has. If there is no constructor with the right parameters you have to implement a setLecturers(Lecturer[] arr) method.

[JosAH]

What i am trying to say is... i can read in all the lecturers from the file and assign them to an array of Lecturer type. But what i dont know is, where i assign the object array to?

Don't lecturers 'belong' to a school?

kind regards,

Jos

edit: darn, the forum is slow today, otherwise I would've been way faster than Phil ... ;-)

[Sage25]

Heres the School class, i coudnt see anywhere that i can assign the lecturers to.
I might no be pickin up on something due to my "analysis paralysis"

package UniversityModel;

import java.io.*;



public class School {
	// Attributes
	private String schoolName;
	private HeadOfSchool head;
	private Course[] courses;
	private int numCourses;

	/**
        * Constructor
        *
        * @param name name of the school
        * @param head the school HOS object
	*/
	public School(String name, HeadOfSchool head){
		this.schoolName = name;
		this.courses = new Course[10];
		this.numCourses = 0;
		this.head = head;
	}

	/**
        * @return the name of this school
        */
	public String getName(){
		return schoolName;
	}


        /**
        * sets the name of this school
        */
        public void setSchoolName(String schoolName) {
        this.schoolName = schoolName;
        }


	/**
        * @return the head of this school
        */
	public HeadOfSchool getHead() {
                return head;
        }

	public void addCourse(Course course){
		if (numCourses < courses.length)
			courses[numCourses++] = course;
	}

	/**
        * @return an array containing the courses offered by this school.
        */
	public Course[] getCourses(){
		Course[] result = new Course[numCourses];

                for (int i = 0; i < numCourses; i++)
		result[i] = courses[i];
                //COMPLETE THIS YOURSELF
		//HINT: you should use a "for" loop
		return result;
	}

	public Course getCourse(String name){
		for (int i = 0; i < numCourses; i++){
			if (courses[i].matchName(name))
				return courses[i];
		}
		return null;
	}
	/**
        * @param courseID @return true if there exists a course in this school
	* whose name contains the specified identifier string, e.g."PG1"
	*/
	public boolean courseExists(String courseId){
		for (int i = 0; i < numCourses; i++){
			if (courses[i].matchName(courseId))
				return true;
		}
		return false;
	}

	/**
        * @param courseID @return an array of Student objects for the course that
	* matches the specified ID
	*/
	public Student[] getStudents(String courseId){
		for (int i = 0; i < numCourses; i++){
			if (courses[i].matchName(courseId)){
				return courses[i].getStudents();
			}
		}
		return null;
	}

	/**
        * @param studentName
	* @return the student with the specified name,
	* if the student does not exist, return null.
	*/
	public Student getStudent(String name){
		for (int i = 0; i < numCourses; i++){
			Student[] students = courses[i].getStudents();

			//check each student in the student array to find a name
			//that matches the parameter
			for (int y = 0; y < students.length; y++){
				if (students[y].getName().matches(name))
                                    return students[y];
                                        //COMPLETE THIS YOURSELF)
						//COMPLETE THIS YOURSELF

			}
		}
		return null;
	}

	/**
        * @return a string representation for this school school name, HOS name and
	* a list of course names offered by this school
	*/
    @Override
	public String toString(){
		String s = "School name : " + this.getName()+"\n"+
                           "Head of school : "+this.head.getName();

                
 
           return s;
        }
        /**
        * Method to read in data from a file in the appropriate format
        */
        public void load(File file){
            String line;
            String[] fields;
            try {
                BufferedReader in = new BufferedReader(new FileReader(file));
               
                
                //Below reads in school name
                line = in.readLine();
                
                this.setSchoolName(line);
                //Below reads details of head of school
                line = in.readLine();
                fields = line.split(",");
                // line below reads number of lecturers
                int numL = Integer.parseInt(in.readLine());
               // lines below reads the lecturers
                  String [] LecturerField;//array to store data after read
                  Lecturer sLecturer[] = new Lecturer[numL];// temp array of lecturers

                for (int i = 0; i < numL; i++) {
                    line = in.readLine();
                    if (line == null)
                        break;
                    LecturerField = line.split(",");
                    sLecturer[i] = new Lecturer(LecturerField[0], LecturerField[1], LecturerField[2],
                            Integer.parseInt(LecturerField[3]), Integer.parseInt(LecturerField[4]));

            }


                HeadOfSchool h  = new HeadOfSchool(fields[0], fields[1], fields[2],
                Integer.parseInt(fields[3]), Integer.parseInt(fields[4]));
                
                this.head=h;
                

                // all above is complete do not touch


              
                // COMPLETE THE READING IN FROM FILE
                // ADD YOUR CODE HERE
                
                
                in.close();
            } catch (IOException e) {
                    // ADD YOUR OWN CODE HERE
            }
    }

        
        
}

[Sage25]

Yes, Lecturers do belong to a School but then again, a HeadOfSchool is in charge of them lecturers?