university_Address.java

package Level_2.week_2.university;

/**
 * Created by pc on 09.08.2016.
 */
public class Address {

    private String city;
    private String street;
    private int buildNumber;
    private int flatNumber;

    public Address(String city, String street, int buildNumber, int flatNumber) {
        this.city = city;
        this.street = street;
        this.buildNumber = buildNumber;
        this.flatNumber = flatNumber;
    }

    public String toString(){
        return String.format("city : %s, street : %s, building : %d, flat : %d",
                city, street, buildNumber, flatNumber);
    }

    public void setCity(String city) {
        this.city = city;
    }

    public void setStreet(String street) {
        this.street = street;
    }

    public void setBuildNumber(int buildNumber) {
        this.buildNumber = buildNumber;
    }

    public void setFlatNumber(int flatNumber) {
        this.flatNumber = flatNumber;
    }

    public String getCity() {

        return city;
    }

    public String getStreet() {
        return street;
    }

    public int getBuildNumber() {
        return buildNumber;
    }

    public int getFlatNumber() {
        return flatNumber;
    }
}

university_SemesterHours.java

package Level_2.week_2.university;

/**
 * Created by pc on 09.08.2016.
 */
public class SemesterHours {

    public static final double DOUBLE = 0.3; //todo 0.3 - make constant
    private int semester;
    private int hours;
    private int minHours;

    public SemesterHours(int semester, int hours){
        this.semester = semester;
        this.hours = hours;
        this.minHours = (int) (hours * DOUBLE); //todo 0.3 - make constant
    }

    public String toString(){
        return String.format("semester number : %d, hours : %d, min hours : %d", semester, hours, minHours);
    }

    public int getSemester(){
        return semester;
    }

    public double getHours(){
        return hours;
    }

    public void setSemester(int semester){
        this.semester = semester;
    }

    public void setHours(int hours){
        this.hours = hours;
    }

    public double getMinHours(){
        return minHours;
    }

}

university_Student.java

package Level_2.week_2.university;

/**
 * Created by pc on 09.08.2016.
 */
public class Student {

    private Subject[] subjectList;

    private String name;
    private Address address;
    private int subjectQuantity;

    private static final int SIZE = 10;

    public Student(String name, Address address) {
        this.name = name;
        this.address = address;
        subjectList = new Subject[SIZE];
    }

    public String toString(){
        return String.format("name : %s, address : %s", name, address.toString());
    }

    public String getName() {
        return name;
    }

    public Address getAddress() {
        return address;
    }

    public Subject[] getSubject() {
        return subjectList;
    }

    public void learning(Subject subject){
        int hours = (int) subject.getSemesterHours().getHours();
        subject.setStudentHours(hours);
        subject.setStudentValue(subject.generateStudentValue());
    }

    public boolean addSubject(Subject subject){
        expandSubjectList();
        subjectList[subjectQuantity++] = subject;
        return true;
    }

    public boolean removeLastSubject(){
        subjectList[subjectQuantity--] = null; //todo check for empty list
        return true;
    }

    public String showAllInfoAboutSubjects(){
        StringBuilder st = new StringBuilder();
        for (int i = 0; i < subjectQuantity; i++) {
            st.append(i + "| " + subjectList[i].toString() + "\n");
        }
        return st.toString();
    }

    public double getGPA(){
        if (subjectQuantity == 0) {
            System.out.println("not available subject");
            return -1;  //todo  Why not 0?
        }

        double gpa = 0;
        for (int i = 0; i < subjectQuantity; i++) {
            gpa += subjectList[i].getStudentValue();
        }
        return gpa / subjectQuantity;
    }

    public void expandSubjectList(){
        if (subjectQuantity >= subjectList.length){
            Subject[] newStudentList = new Subject[subjectList.length * 2];
            System.arraycopy(subjectList, 0, newStudentList, 0, subjectList.length);
            subjectList = newStudentList;;
        }
    }
}

university_Subject.java

package Level_2.week_2.university;

/**
 * Created by pc on 09.08.2016.
 */
public class Subject {

    private String name;
    private SemesterHours semesterHours;
    private int studentHours;
    private int studentValue;
    private static final int MIN_RANGE = 2;
    private static final int MAX_RANGE = 5;


    public Subject(String name, SemesterHours semesterHours){
        this.name = name;
        this.semesterHours = semesterHours;
        this.studentHours = generateStudentHours();
        this.studentValue = generateStudentValue();
    }

    public String toString(){
        return String.format("subject : %s, %s , student hours : %d, rating : %d",
                name, semesterHours.toString(), studentHours, studentValue);
    }

    public boolean passExamination(Student student){ //todo Why we need variable student?
        if (generateStudentValue() > MIN_RANGE && generateStudentValue() <= MAX_RANGE) {
            if (generateStudentHours() >= semesterHours.getMinHours()) {
                return true;
            }
        }
        return false;
    }

    public double getStudentValue(Subject subject){
        return subject.getStudentValue();
    }

    public String getName() {
        return name;
    }

    public SemesterHours getSemesterHours() {
        return semesterHours;
    }

    public int getStudentHours() {
        return studentHours;
    }

    public int getStudentValue() {
        return studentValue;
    }

    public int generateStudentValue(){
        return (int)(Math.random() * (MAX_RANGE - 2)) + 2;
    }

    public int generateStudentHours(){
        return (int)(Math.random() * semesterHours.getHours());
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setSemesterHours(SemesterHours semesterHours) {
        this.semesterHours = semesterHours;
    }

    public void setStudentHours(int studentHours) {
        this.studentHours = studentHours;
    }

    public void setStudentValue(int studentValue) {
        this.studentValue = studentValue;
    }
}

university_Test.java

package Level_2.week_2.university;

/**
 * Created by oleksandr.maslovskyj on 12.08.2016.
 */
public class Test {

    public static void main(String[] args) {

        Address address = new Address("Kyiv", "some street", 10, 123);
        SemesterHours semesterHours = new SemesterHours(1, 120);

        Subject subject0 = new Subject("math", semesterHours);
        Subject subject1 = new Subject("literature", semesterHours);
        Subject subject2 = new Subject("philof", semesterHours);

        Student student = new Student("student1", address);

        student.addSubject(subject0);
        student.addSubject(subject1);
        student.addSubject(subject2);

        student.learning(subject1);
        System.out.println(student.showAllInfoAboutSubjects());

        student.removeLastSubject();
        System.out.println(student.showAllInfoAboutSubjects());

        double gpa = student.getGPA();
        double expected = 1.5; //todo why 1.5? StudentValue is it random?
        System.out.print(gpa == expected); 
        System.out.println(" = gpa result is: " + gpa);

    }
}