TestingComposition

import java.util.*;
public class StudentTest {

	public static void main(String[] args) {
		// Input scanner object
		Scanner sc = new Scanner(System.in);

		// List of electives
		ArrayList<Elective> electives = new ArrayList<>();
		// List of students
		ArrayList<Student> students = new ArrayList<>();

		// Add electives to electives list
		electives.add(new Elective("Art", 5));
		electives.add(new Elective("Cooking", 4));
		electives.add(new Elective("Music", 3));

		// Add students to studentNames list
		students.add(new Student("A"));
		students.add(new Student("B"));
		students.add(new Student("C"));
		students.add(new Student("D"));
		students.add(new Student("E"));

		for(int i = 0; i < students.size() - 1; i++) {

			System.out.println("Enter 1: Art ; Enter 2: Cooking ; Enter 3: Music");
			int electiveInput = sc.nextInt();

			if(electiveInput == 1) {
				if(electives.get(0).getClassSize() < electives.get(0).getMaxClassSize()) {
					students.get(i).addElective(electives.get(0));
					electives.get(0).addStudent(students.get(i));
				}

			}

			if(electiveInput == 2) {

			}

			if(electiveInput == 3) {

			}


		}

		System.out.println(electives.toString());
		sc.close();
	}
}


// ELECTIVE CLASS
import java.util.ArrayList;

public class Elective {
	private String name;		//contains the name of the elective
	private int maxClassSize;		//contains the maximum number that can enroll in the course
	private int classSize;		//contains the current number enrolled in the course
	private ArrayList<Student> enrollees;

	//constructs an object of type Elective
	public Elective(String name, int maxClassSize){
		this.name = name;
		this.maxClassSize = maxClassSize;
		this.classSize = 0;
		enrollees = new ArrayList<Student>();
	}
	//returns the name of the elective
	public String getName(){
		return name;
	}

	//returns the maximum number to be enrolled in the course
	public int getMaxClassSize(){
		return maxClassSize;
	}

	//returns the current enrollment in the course
	public int getClassSize(){
		return classSize;
	}

	//adds Student s to this elective
	//returns true if successfully added
	//returns false if unable to add the student
	public boolean addStudent(Student student){
		if(classSize <= maxClassSize){
			enrollees.add(student);
			classSize += 1;
			System.out.println("ClassSize: " + classSize);
			return true;
		}
		else{
			return false;
		}
	}

	//returns the ArrayList of Students in the course
	public ArrayList<Student> getStudents(){

		return enrollees;
	}
	@Override
	public String toString() {
		return "\nElective " + name + ": [maxClassSize: " + maxClassSize + " classSize: " + classSize + " enrollees: "
				+ enrollees + "]";
	}



}


// STUDENT CLASS
import java.util.ArrayList;

public class Student {

	//the student's name
	private String name;

	//the list of electives that the student has enrolled in
	private ArrayList<Elective> electives = new ArrayList<Elective>();

	public Student(){
		name = "NO NAME";
		electives = new ArrayList<Elective>();
	}
	//creates an object of type Student
	public Student(String name){
		this.name = name;
	}

	//returns the name of the Student object
	public String getName(){
		return name;
	}

	//registers the student for the input Elective, if able
	//returns true if the Student was able to register for Elective elective
	//returns false if the Student cannot register
	public void addElective(Elective elective) {
		// Check to see if the class is full
		electives.add(elective);
	}

	//returns the ArrayList of Electives that the student is
	//	registered for
	public ArrayList<Elective> getElectives(){
		return electives;
	}

	@Override
	public String toString() {
		return "Student [name=" + name + ", electives=" + electives + "]";
	}


}