public class DataEditor extends JFrame implements ActionListener {

   protected JTextField tStudent, tName, tMajor, tMinor, tGPA, tEmail, tState, tYOG, tFileName;

   protected JLabel lStudent, lName, lMajor, lMinor, lGPA, lEmail, lState, lYOG, lFileName;

   protected JButton bSave, bNewFile, bNext, bPrev;

   protected String name, major, minor, email, state, fileName;

   protected Student[] students = new Student[10];

   protected int student, yog, placeHolder;

   protected double gpa;


   /*

      Student SSN integer
      Name
      Major
      Minor
      GPA double
      Email
      Home State
      Expected year of Graduation

   */

   public static void main(String args[ ]) throws IOException, ClassNotFoundException {

      JFrame frame = new DataEditor();
      frame.setTitle("Data Editor");
      frame.setSize(300, 150);
      frame.setLocationRelativeTo(null);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);

   }//end of main method

   public DataEditor() throws ClassNotFoundException, IOException {

      ObjectInputStream record = new ObjectInputStream(new FileInputStream("registrar.dat"));

      Student student1 = (Student)(record.readObject());
      Student student2 = (Student)(record.readObject());
      Student student3 = (Student)(record.readObject());
      Student student4 = (Student)(record.readObject());
      Student student5 = (Student)(record.readObject());
      Student student6 = (Student)(record.readObject());
      Student student7 = (Student)(record.readObject());
      Student student8 = (Student)(record.readObject());
      Student student9 = (Student)(record.readObject());
      Student student10 = (Student)(record.readObject());

      placeHolder = 0;

      setLayout(new FlowLayout());

      JPanel tFields = new JPanel();
      tFields.setLayout(new GridLayout(9,2));

      // student
      lStudent = new JLabel("Student SSN");
      tStudent = new JTextField(16);
      tStudent.setText("");
      tFields.add(lStudent);
      tFields.add(tStudent);

      // name
      lName = new JLabel("Student Name");
      tName = new JTextField(16);
      tName.setText("");
      tFields.add(lName);
      tFields.add(tName);

      // major
      lMajor = new JLabel("Student Major");
      tMajor = new JTextField(16);
      tMajor.setText("");
      tFields.add(lMajor);
      tFields.add(tMajor);

      // Minor
      lMinor = new JLabel("Student Minor");
      tMinor = new JTextField(16);
      tMinor.setText("");
      tFields.add(lMinor);
      tFields.add(tMinor);

      // gpa
      lGPA = new JLabel("Student GPA");
      tGPA = new JTextField(16);
      tGPA.setText("");
      tFields.add(lGPA);
      tFields.add(tGPA);

      // email
      lEmail = new JLabel("Student Email");
      tEmail = new JTextField(16);
      tEmail.setText("");
      tFields.add(lEmail);
      tFields.add(tEmail);

      // state
      lState = new JLabel("Student Home State");
      tState = new JTextField(16);
      tState.setText("");
      tFields.add(lState);
      tFields.add(tState);

      // yog
      lYOG = new JLabel("Student Year of Graduation");
      tYOG = new JTextField(16);
      tYOG.setText("");
      tFields.add(lYOG);
      tFields.add(tYOG);

      refresh(students[placeHolder]);

      // Save Changes button
      bSave = new JButton("Save Changes");
      tFields.add(bSave);
      bSave.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          switch(placeHolder){
            case 0:
               update(students[1]);
               break;
            case 1:
               update(students[2]);
               break;
            case 2:
               update(students[3]);
               break;
            case 3:
               update(students[4]);
               break;
            case 4:
               update(students[5]);
               break;
            case 5:
               update(students[6]);
               break;
            case 6 :
               update(students[7]);
               break;
            case 7:
               update(students[8]);
               break;
            case 8 :
               update(students[9]);
               break;
            case 9:
               update(students[10]);
               break;
            default:
               break;
          }//end switch
        }
      });

      // New File button
      bNewFile = new JButton("New File");
      tFields.add(bNewFile);
      bNewFile.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e){
           File f = new File(fileName + ".dat");
             try {
               DataStream.newFile(fileName, student1, student2, student3,
                 student4, student5, student6, student7, student8, student9, student10);
             }
              catch(IOException ioe) {
                 tFileName.setText("Choose a new File Name");
              }
              catch(ClassNotFoundException cnfe) {
                 tFileName.setText("Choose a new File Name");
              }

           }

      });

      // Next button
      bNext = new JButton("Next");
      tFields.add(bNext);
      bNext.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
           if(placeHolder < 9){
             nextBt();
           }
        }
      });

      // Prev button
      bPrev = new JButton("Prev");
      tFields.add(bPrev);
      bPrev.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
           if(placeHolder > 0){
             prevBt();
           }

        }
      });
   }

   public void actionPerformed(ActionEvent event){

   }

   public void update(Student s){
      student = Integer.parseInt(tStudent.getText());
      name = ""+ tName.getText();
      major = ""+ tMajor.getText();
      minor = ""+ tMinor.getText();
      gpa = Double.parseDouble(tGPA.getText());
      email = ""+ tEmail.getText();
      state = ""+ tState.getText();
      yog = Integer.parseInt(tYOG.getText());

      s.setSNumber((Integer)student);
      s.setName(name);
      s.setMajor(major);
      s.setMinor(minor);
      s.setGPA((Double)gpa);
      s.setEmailAddress(email);
      s.setHomeState(state);
      s.setYearofGrad((Integer)yog);
   }

   public void refresh(Student s) {
      tStudent.setText(""+ s.getSNumber());
      tName.setText(""+ s.getName());
      tMajor.setText(""+ s.getMajor());
      tMinor.setText(""+ s.getMinor());
      tGPA.setText(""+ s.getGPA());
      tEmail.setText(""+ s.getEmailAddress());
      tState.setText(""+ s.getHomeState());
      tYOG.setText(""+ s.getYearOfGrad());
   }

   public void nextBt(){
      if(placeHolder < 9){
        placeHolder++;
        refresh(students[placeHolder]);
      }
   }

   public void prevBt(){
      if(placeHolder > 0){
        placeHolder--;
        refresh(students[placeHolder]);
      }
   }


}//end of the class

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

public class DataStream{

   public static void main(String[] args) throws IOException, ClassNotFoundException{


      // Create an output stream for file temp.dat
      ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream("registrar.dat"));


      //write Student information to the file

      //Student 1
      output.writeObject(new Student(123456789,"Viola Bailey","Political Science","",2.6,"vbailey@smc.edu","MA",2020));
      output.writeObject(new Student(192837465,"John Smith","Computer Science","",3.6,"jsmith@smc.edu","MA",2020));
      output.writeObject(new Student(928374658,"Jackson James","Philosophy","Science",4.0,"jjames@smc.edu","VT",2020));
      output.writeObject(new Student(783648592,"Jane Doe","Biology","Math",3.2,"jdoe@smc.edu","LA",2018));
      output.writeObject(new Student(238239742,"Zach James","Political Science","",2.1,"zjames@smc.edu","MA",2021));
      output.writeObject(new Student(271638493,"Marvin Smith","Psychology","",3.8,"msmith@smc.edu","MA",2017));
      output.writeObject(new Student(123456789,"Allison Brown","Environmental Studies","",2.6,"abrown@smc.edu","MA",2020));
      output.writeObject(new Student(123456789,"John Lyons","Media Studies","",4.0,"jlyons@smc.edu","MA",2020));
      output.writeObject(new Student(123456789,"Laura Patnode","Journalism","",3.1,"lpatnode@smc.edu","CT",2019));
      output.writeObject(new Student(123456789,"Paul Allen","Political Science","",2.9,"pallen@smc.edu","NH",2017));


      //close output stream
      output.close();

    // Create an input stream for file temp.dat
    ObjectInputStream input =
      new ObjectInputStream(new FileInputStream("registrar.dat"));

    Student student1 = (Student)(input.readObject());
    Student student2 = (Student)(input.readObject());
    Student student3 = (Student)(input.readObject());
    Student student4 = (Student)(input.readObject());
    Student student5 = (Student)(input.readObject());
    Student student6 = (Student)(input.readObject());
    Student student7 = (Student)(input.readObject());
    Student student8 = (Student)(input.readObject());
    Student student9 = (Student)(input.readObject());
    Student student10 = (Student)(input.readObject());

    System.out.print(student1.toString());

    // Read student test scores from the file
    input.close();

   }
   public static void newFile(String file, Student s1, Student s2, Student s3, Student s4,
      Student s5, Student s6, Student s7, Student s8, Student s9, Student s10) throws IOException, ClassNotFoundException{

      ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(""+ file + ".dat"));


      out.writeObject(s1);
      out.writeObject(s2);
      out.writeObject(s3);
      out.writeObject(s4);
      out.writeObject(s6);
      out.writeObject(s7);
      out.writeObject(s8);
      out.writeObject(s9);
      out.writeObject(s10);
   }
}


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

public class Student implements java.io.Serializable {

   int sNumber;
   String name;
   String major;
   String minor;
   double gpa;
   String emailAddress;
   String homeState;
   int yearOfGrad;

   public Student(){
      sNumber = 111111092;
      name = "John Smith";
      major = "Computer Science";
      minor = "";
      gpa = 3.0;
      emailAddress = "jsmith@smc.edu";
      homeState = "NH";
      yearOfGrad = 2017;
   }
   public Student(int s, String n, String m1, String m2, double g, String e, String h, int y){
      sNumber = s;
      name = n;
      major = m1;
      minor = m2;
      gpa = g;
      emailAddress = e;
      homeState = h;
      yearOfGrad = y;
   }
   public void setSNumber(int s){
      sNumber = s;
   }
   public void setName(String n){
      name = n;
   }
   public void setMajor(String m){
      major = m;
   }
   public void setMinor(String m){
      minor = m;
   }
   public void setGPA(double g){
      gpa = g;
   }
   public void setEmailAddress(String e){
      emailAddress = e;
   }
   public void setHomeState(String h){
      homeState = h;
   }
   public void setYearofGrad(int y){
      yearOfGrad = y;
   }
   public int getSNumber(){
      return sNumber;
   }
   public String getName(){
      return name;
   }
   public String getMajor(){
      return major;
   }
   public String getMinor(){
      return minor;
   }
   public double getGPA(){
      return gpa;
   }
   public String getEmailAddress(){
      return emailAddress;
   }
   public String getHomeState(){
      return homeState;
   }
   public int getYearOfGrad(){
      return yearOfGrad;
   }
   public String toString(){
      return sNumber + " "
             + name + " "
             + major + " "
             + minor + " "
             + gpa + " "
             + emailAddress + " "
             + homeState + " "
             + yearOfGrad;
   }


}