import java.io.*;
import java.util.*;
 
class Estudiante extends Persona implements Serializable {
	private String idNo;
	private byte gradEst;
	private String codeSeat;
 
	public Estudiante(String name, char sex, int age, String location, String idNo, byte gradEst, String codeSeat){
		super(name, sex, age, location); 
		setIdNo(idNo);
		setGrade(gradEst);
		setCodeSeat(codeSeat);
		}
 
	public void setIdNo(String idNo){
		this.idNo=idNo;
		}
 
	public void setGrade(byte gradEst){
		this.gradEst=gradEst;
		}
 
	public void setCodeSeat(String codeSeat){
		this.codeSeat=codeSeat;
		}
 
	public String getIdNo(){
		return idNo;
		}		
 
	public byte getGrado(){
		return gradEst;
		}
 
	public byte getCodeSeat(){
		return codeSeat;
		}
 
	public static ArrayList<Student> generateBackup(){
		FileInputStream f3 = null;
		ObjectInputStream f4 = null;
		ArrayList<Student> students = new ArrayList<Student>();
		try{
			f3=new FileInputStream("C:\\Documents and Settings\\Daniel Garcia\\Escritorio\\Andres\\Final\\students.dat");
			f4=new ObjectInputStream(f3);
			while(true){
				Student e=(Student)f4.readObject();
				students.add(e);
					}
 
			}
 
			catch(EOFException e){
			System.out.println("End of file");
			}
 
		catch(IOException e){
			System.out.println("Error reading file");
			}
		catch(ClassNotFoundException e){
				System.out.println("Error in type of class");
				}
		finally{
			try{
			f4.close();
			f3.close();
			}
			catch(IOException e){
				System.out.println("Error closing file");
			}
			}
			return students;
 
	}
 
	public static void writeBackup(ArrayList<Student> students){
		FileOutputStream f1 = null;
		ObjectOutputStream f2 = null;
		try{
			f1=new FileOutputStream("C:\\Documents and Settings\\Daniel Garcia\\Escritorio\\Andres\\Final\\students.dat");
			f2=new ObjectOutputStream(f1);
			for(Student e : students){
				f2.writeObject(e);
			}
 
		}
		catch(IOException e){
			System.out.println ("Error saving file");
		}
			finally{
		try{
			f2.close();
			f1.close();		
		}
		catch(IOException e){System.out.println ("Error closing file");
		}
		}
		}
 
		}

import java.io.*;
import java.util.*;
class Main{
 
	public static void main (String args[]){
		boolean menu = false;
		Student x = null;
		do{
		System.out.println("Welcome!!");
		System.out.println();
		System.out.println("What do you want to do?");
		System.out.println("1) Separate a seat");
		System.out.println("2) Cancel a seat");
		System.out.println("3) Another here");
		System.out.println("4) Another here");
		System.out.println("5) Another here");
		System.out.println();
		char ans = Lectura.readChar();
		System.out.println();
 
		switch(ans){
			case '1':
					Student.generateBackup();			
					System.out.println("Name");
	String name = Lectura.readString();
					System.out.println("Age");
	byte age = Lectura.readByte();
					System.out.println("Sex M/F");
	char sex = Lectura.readChar();
					System.out.println("Id. No.");
	String idNo = Lectura.readString();
					System.out.println("Grade of Studies");
	byte gradEst = Lectura.readByte();
					System.out.println("Location");
	String location = Lectura.readString();					
	System.out.println("Here is a Seating chart");
	Seatings.displaySeatings();
					System.out.println("Select your seat");
	String codeSeat = Lectura.readString();	
 
	x = new Estudiante(name,sex,age,location,idNo,gradEst,codeSeat);
 
 
	//I need to put x in the arraylist but I don't know how to do that, any ideas??				Estudiante.writeBackup();
 
					menu=true;
					break;
 
 
					}
		}
		while(menu);
 
 
		}
}

//... necessary imports
 
public class ArrayList<T> extends List<T> implements Collection<T>, Serializable{
 
    private transient Object[] elements = null; // key point @_@
 
    public T get(int position){
          return (T)elements[position];
    }
}