/*
 * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
 * Date: 2022/03/03
 * Description: Student class
 */

public class Student {
    /**
     * Student's ID number
     */
    private int ID;

    /**
     * Constructor A public constructor with one parameter
     * 
     * @param id   the ID of the student, only accept positive integer if the id is
     *             not positive, it will be set to 0
     */
    public Student(int ID) {
        if (ID > 0) {
            this.ID = ID;
        } else {
            this.ID = 0;
        }
    }

    /**
     * Getter A public getter for the ID.
     * 
     * @return the ID of the student
     */
    public int getID() {
        return ID;
    }

    /**
     * Test method A public method to test the class
     *
     * @return void
     */
    public static void testStudent() {
        Student s1 = new Student(-39);
        Student s2 = new Student(114514);
        Student s3 = new Student(0);

        // print true
        System.out.println(s1.getID() == 0);
        System.out.println(s2.getID() == 114514);
        System.out.println(s3.getID() == 0);
    }
}