Courses/Mathesis/Intro2ProgrammingWithJava/Week3/3.6-Exercise1/sandbox/student.html

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<sandbox version="java17" mainclass="Student" preview="true" v-cloak>
<sandbox-source name="Student.java">
public class Student {

    private static final int MAX_SIZE = 20;
    private static final String NONE = "<Κενό>";
    private static final String NO_CLASSROOM = "--";
    private static final int CLASSROOM_NAME_LENGTH = 2;

    private static int amCounter = 0;
    
    private final int am;
    private String firstName = NONE;
    private String lastName = NONE;
    private int age = -1;  // 15-18
    private String classRoom = NO_CLASSROOM;

    public Student(String firstName, String lastName, int age) {
        am = ++amCounter;
        if (isNameValid(firstName)) {
            this.firstName = firstName.trim();
        }
        if (isNameValid(lastName)) {
            this.lastName = lastName.trim();
        }
        if (isAgeValid(age)) {
            this.age = age;
        }
    }

    public int getAm() {
        return am;
    }
    
    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = isNameValid(firstName) ? firstName.trim() : NONE;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = isNameValid(lastName) ? lastName.trim() : NONE;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = isAgeValid(age) ? age : -1;
    }

    public String getClassRoom() {
        return classRoom;
    }

    public void setClassRoom(String classRoom) {
        this.classRoom = isClassRoomValid(classRoom) ? classRoom : NO_CLASSROOM;
    }

    @Override
    public String toString() {
        return "Student{" + "am=" + am + ", firstName=" + firstName + ", lastName=" + lastName + ", age=" + age + ", classRoom=" + classRoom + '}';
    }
    
    private boolean isAgeValid(int inAge) {
        return inAge >= 15 && inAge <= 18;
    }
    
    private boolean isNameValid(String name) {
        return !name.isBlank() && name.length() <= MAX_SIZE;
    }
    
    private boolean isClassRoomValid(String classRoom) {
        return !classRoom.isBlank() && classRoom.length() == CLASSROOM_NAME_LENGTH 
                && (classRoom.startsWith("Α") 
                || classRoom.startsWith("Β")
                || classRoom.startsWith("Γ"))
                && classRoom.charAt(1) >= '1'
                && classRoom.charAt(1) <= '9';
    }
	 
    public static void main(String[] args) {
    	Student ioannis = new Student("Γιάννης", "Αντεκοτούμπο", 16);
		System.out.println("AM: " + ioannis.getAm());   // 1
		ioannis.setClassRoom("Β1");
		System.out.println(ioannis.getClassRoom());     // Β1
    }
}</sandbox-source>
</sandbox>
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