Notes

import java.util.Scanner;

import java.io.Serializable;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.ArrayList;
import java.util.List;

public class Student implements Serializable {
private int id;
private String name;
private float developmentScore;
private float operationScore;
private float mathScore;
private String status;

public static String FILE_NAME = "student_list.txt";

public Student() {
this.id = 0;
this.name = "";
this.developmentScore = 0;
this.operationScore = 0;
this.mathScore = 0;
this.status = "unknown";
}

public Student(int id, String name, float developmentScore, float operationScore, float mathScore, String status)
{
this.id = id;
this.name = name;
this.developmentScore = developmentScore;
this.operationScore = operationScore;
this.mathScore = mathScore;
this.status = status;
}

public void printInfo()
{
System.out.println("ID: " + this.id);
System.out.println("Name: " + this.name);
System.out.println("Development Score: " + this.developmentScore);
System.out.println("Operation Score: " + this.operationScore);
System.out.println("Match Score: " + this.mathScore);
System.out.println("Status: " + this.status);
}

public void inputId()
{
Scanner sc = new Scanner(System.in);

do {
System.out.println("Input your id: ");
while (!sc.hasNextInt()) {
System.out.println("Wrong data! Please input right your id: ");
sc.next();
}
this.id = sc.nextInt();
} while (this.id <= 0);
}

public void inputName()
{
System.out.println("Input your name: ");
Scanner sc = new Scanner(System.in);
while(sc.hasNextLine()) {
this.name = sc.nextLine();
}
}

public void inputDevelopmentScore()
{
System.out.println("Input your development score: ");
Scanner sc = new Scanner(System.in);
while(sc.hasNextFloat()) {
this.developmentScore = sc.nextFloat();
}
}

public void inputOperationScore()
{
System.out.println("Input your operation score: ");
Scanner sc = new Scanner(System.in);
while(sc.hasNextFloat()) {
this.developmentScore = sc.nextFloat();
}
}

public void inputMathScore()
{
System.out.println("Input your math score: ");
Scanner sc = new Scanner(System.in);
while(sc.hasNextFloat()) {
this.developmentScore = sc.nextFloat();
}
}

public void inputStatus()
{
System.out.println("Input your status: ");
Scanner sc = new Scanner(System.in);
while(sc.hasNextLine()) {
this.status = sc.nextLine();
}
}

public void inputAllInfo()
{
this.inputId();
this.inputName();
this.inputDevelopmentScore();
this.inputOperationScore();
this.inputMathScore();
this.inputStatus();
}

public boolean isExists()
{
List<Student> listStudent = readListFromFile();

if (listStudent == null) {
return true;
}

for(Student student: listStudent) {
if (this.id == student.id) {
return false;
}
}

return true;
}

public static boolean writeListToFile(Student student) throws IOException
{
try {

FileOutputStream f = new FileOutputStream(new File(FILE_NAME));
ObjectOutputStream o = new ObjectOutputStream(f);

ArrayList<Student> listStudent = new ArrayList<Student>();
listStudent.add(student);
// Write objects to file
o.writeObject(listStudent);

o.close();
f.close();

return true;
} catch (FileNotFoundException e) {
System.out.println("File not found");
} catch (IOException e) {
System.out.println("Error initializing stream");
}

return false;
}

public static List<Student> readListFromFile()
{
try {
FileInputStream f = new FileInputStream(new File(FILE_NAME));
ObjectInputStream o = new ObjectInputStream(f);

// Read objects
ArrayList<Student> result = (ArrayList<Student>) o.readObject();

o.close();
f.close();

return result;
} catch (FileNotFoundException e) {
System.out.println("File not found");
} catch (IOException e) {
System.out.println("Error initializing stream");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return null;
}

public static Student readLatestFromFile()
{
List<Student> listStudent = readListFromFile();

if (listStudent == null) {
return null;
}

return listStudent.get(listStudent.size() - 1);
}
}