package managestudent;

import java.util.Scanner;

class Student {

    int ID;
    String name;
    int age;

    public void inputInformation(int xID, String xName, int xAge) {
        ID = xID;
        name = xName;
        age = xAge;
    }

    public void outputInformation() {
        System.out.println(ID + " - " + name + " - " + age);
    }

}

class ManyStudents {

    int ID = 0, age = 0;
    String name = null;
    Scanner input = new Scanner(System.in);
    Student[] studentX = new Student[30];
    int num;

    public void searchAge() {
        for (int i = 0; i < num; i++) {
            if (studentX[i].age <= 18) {
                studentX[i].outputInformation();
            }
        }
    }

    public void inputMany() {
        System.out.println("Input the number of student: ");
        num = input.nextInt();
        for (int i = 0; i < num; i++) {
            studentX[i] = new Student();
            System.out.print(i + 1 + ". ");
            System.out.println("#Input :");
            System.out.print("+ ID student :");
            ID = input.nextInt();
            System.out.print("+ Name of student: ");
            // clear cache
            input.nextLine();
            name = input.nextLine();
            System.out.print("+ Age of student: ");
            age = input.nextInt();
            studentX[i].inputInformation(ID, name, age);
        }

    }

    public void outputMany() {
        System.out.println("----------------------------------------");
        for (int i = 0; i < num; i++) {
            studentX[i].outputInformation();
        }
    }
}

public class ManageStudent {

    public static void main(String[] args) {
        ManyStudents manySt = new ManyStudents();
        manySt.inputMany();
        manySt.outputMany();
        System.out.println("----------------------------------------");
        manySt.searchAge();
    }

}