class EditStudentFrame extends JFrame implements ActionListener{

    int recordNumber;
    JLabel jl_fname// what other Jlabels?
    JTextField jt_fname//what other jTextFields?
    JButton jb_edit;
    StudentGui2 mainFrame;
    Vector students;
    int studentNumberToEdit;

    EditStudentFrame(Vector studentsIn, int studentNumberToEdit, StudentGui2 mnFrame){
        
        students=studentsIn;
        recordNumber=studentNumberToEdit;
       
        student1=(Student)students.get(recordNumber);
        
        mainFrame=mnFrame;  //get reference to the main JFrame, so we can update the JTextArea and write out the vector
        
        getContentPane().setLayout(new BoxLayout(getContentPane(),BoxLayout.Y_AXIS));
        
        jl_fname=new JLabel("First Name: ");
        //what else?
        
        jt_fname=new JTextField(10);
        //what else?
        
        //put in current values
        jt_fname.setText(student1.fName);
        //what else?
          
        jb_edit=new JButton("Edit");
        jb_edit.addActionListener(this);//don't need to set command, because this is the only button in this Frame!
        
        getContentPane().add(jl_fname);
        //what else do you need to add?
        
        setSize(400,400);//try pack() instead
        setVisible(true);
          
    }
    
    public void actionPerformed(ActionEvent evt) {
            //only one button, so we don't need to check which one was pressed
            //could do the work below in another method
            Student student1=new Student();
            
            //put updated info in an object of type Student
            student1.fName=jt_fname.getText();
            //what else?
            
            //replace the old student with the edited student in the vector list
            students.set(recordNumber,student1); //set() replaces the element at the record number
            mainFrame.writeStudents(); //write out the updated file
            mainFrame.writeTextArea();  
            this.setVisible(false);  //getting rid of edit window, there must be a better way to do this, if you find it, let me know!
    } 
}
  
public class StudentGui2 extends JFrame implements ActionListener
{
   //lots of code removed
    
    public void editStudent(){
        String studentToEdit;
        Student student1=new Student();
        int i=0; //index, initialized to zero
        EditStudentFrame editStudent1;  //this is a pop up frame for editing students
        
        studentToEdit=jt_editStudentName.getText();
        
        student1=(Student)students.get(i);
        
        while(true){
            if (student1.fName.equals(studentToEdit)) break;  //break out of this loop, otherwise, check next student
            i++;
            student1=(Student)students.get(i);
        }
        
        editStudent1= new EditStudentFrame(students, i, this);// students is the vector of Students; i is the number of the student to edit
        //'this' is a reference to the current JFrame, so we can call some methods from the other class
        
    }
    
    
   
    
    //note that it is very inefficient to write the entire file each time you add a student. How could you be more effient?
    public void writeStudents(){
        //how are you going to write the student file?
    }
    
    public void writeTextArea(){
       //need to rewrite the text area
    }