import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.LinkedList;
import java.util.Scanner;

public class Student_Manage {
	static Student tree;
	static LinkedList<Student> list = new LinkedList<Student>();
	public static boolean Save_to_file(LinkedList<Student> ds, String path) {
        try {
            FileOutputStream fos = new FileOutputStream(path);
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(ds);
            oos.close();
            fos.close();
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }
    @SuppressWarnings("unchecked")
	public static LinkedList<Student> Read_from_file(String path) {
        
        LinkedList<Student> s=null;
		try {
            FileInputStream fis = new FileInputStream(path);
            ObjectInputStream ois = new ObjectInputStream(fis);
            Object o = ois.readObject();
            s = (LinkedList<Student>) o;
            ois.close();
            fis.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return s;
    }
   public static void Readstudentlist(LinkedList<Student> list) {
   System.out.printf("%-3s %-8s %-20s %-10s %-10s","#","Std_id","Std_name","Std_result","Std_rank");
   System.out.println();
    int stt=0;
    for (Student e:list) {
    	System.out.printf("%-3d %-8s %-20s %-10.2f %-10s",++stt,e.getStudent_id(),e.getStudent_name(),e.getStudent_result(),e.getStudent_rank());
    	System.out.println();
    	}
   
    }
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		/*
		Student s1 = new Student("100","Nguyen Van Dung");
		Student s2 = new Student("104","Nguyen Thi Hanh");
		Student s3 = new Student("106","Tran Thi Hai");
		Student s4 = new Student("109","Le Van Phuoc");
		Student s5 = new Student("101","Quach Thanh Danh");
		Student s6 = new Student("105","Vu Van Hung");
		Student s7 = new Student("102","Le Tien Loc");
		Student s8 = new Student("107","Pham Quang Minh");
		Student s9 = new Student("108","Ho Van Mui");
		Student s10 = new Student("103","Nguyen Van Dat ");
		Student s11 = new Student("110","Le Van Hai");
		list.addLast(s1);
		list.addLast(s2);
		list.addLast(s3);
		list.addLast(s4);
		list.addLast(s5);
		list.addLast(s6);
		list.addLast(s7);
		list.addLast(s8);
		list.addLast(s9);
		list.addLast(s10);
		list.addLast(s11);
		Readstudentlist(list);
		
		Save_to_file(list,"D:\\StudentList.dat");
		*/
		int menu=1;
		Scanner scan = new Scanner(System.in);
		while (menu!=0) {
		System.out.println("STUDENT MANAGE PROGRAM");
		System.out.println("1-Open Student List from File");
		System.out.println("2-View Student List ");
		System.out.println("0-Save/Exit");
		System.out.println("Please choose: ");
		menu = scan.nextInt();
					
		switch (menu) {
		case 1: {list=Read_from_file("D:\\StudentList.dat");break;}
		case 2: {System.out.println("READ LIST:"); Readstudentlist(list); break;}
		case 0: {Save_to_file(list,"D:\\StudentList.dat");break;}
		}
		}
		
		scan.close();
		}

	}