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I am trying to write a file processing application but the program won't wait for the user to select a file before moving and finishing the function. I've tried to use wait() and notify() to make it stop but the program now freezes and buttons d and e never show up.

import javax.swing.*;
import java.awt.event.*;
import java.io.File;

public class pdfEditor 

static JFrame inter = new JFrame("The Point Updater");
static JLabel reminder = new JLabel("Please select a function:");
static boolean i = false;
JButton a, b, c, d, e;
JFileChooser fc;

public static void main(String[] args) 

 //Sets the window
 inter.setSize(750, 250);
 inter.setLocation(100, 150);
 inter.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 inter.setLayout(null);

 //Label for commands for the user
 reminder.setBounds(50, 50, 650, 30);

 //add a button
 JButton b = new JButton("Update Trainings");
 b.setBounds(50, 150, 135, 30);

 JButton c = new JButton("Update Employees");
 c.setBounds(200, 150, 140, 30);

 JButton a = new JButton("Export Points");
 a.setBounds(355, 150, 135, 30);

 //add them to the frame
 inter.add(reminder);
 inter.add(a);
 inter.add(b);
 inter.add(c);

 inter.setVisible(true);

 //Process selection
 //TODO add catches for unformatted spreadsheets
 a.addActionListener(new ActionListener() //If export Points button is selected

 @Override
 public void actionPerformed(ActionEvent arg0) 
 reminder.setText("Kashikomarimashita!");
 exportPoints();
 
 );

 b.addActionListener(new ActionListener() //If update trainings is selected

 @Override
 public void actionPerformed(ActionEvent arg0) 
 reminder.setText("Make sure the type is Individual Completions and the columns are set to Training, Employee and Date.");
 File file = null;
 try 
 file = requestInputSpreadsheet();
 catch (InterruptedException e) 
 // TODO Auto-generated catch block
 e.printStackTrace();
 
 updateTraining(file);
 
 );

 c.addActionListener(new ActionListener() //If update employees is selected

 @Override
 public void actionPerformed(ActionEvent arg0) 
 reminder.setText("Please import a employee list from iScout or Quickbase.");
 File file = null;
 try 
 file = requestInputSpreadsheet();
 catch (InterruptedException e) 
 // TODO Auto-generated catch block
 e.printStackTrace();
 
 updateEmployees(file);
 
 );


//Asks the user for a spreadsheet to be used in processing.
public static File requestInputSpreadsheet() throws InterruptedException

 //makes file chooser
 JFileChooser fc = new JFileChooser();
 fc.addChoosableFileFilter(new SpreadsheetFilter());
 fc.setAcceptAllFileFilterUsed(false);

 //makes new buttons and label
 JLabel name = new JLabel();
 name.setBounds(180, 100, 270, 30);
 JButton d = new JButton("Choose File...");
 d.setBounds(50, 100, 135, 30);
 JButton e = new JButton("Go!");
 e.setBounds(450, 100, 50, 30);

 inter.add(d);
 SwingUtilities.updateComponentTreeUI(inter);

 //switch for the file chooser if file was chosen successfully
 i = false;
 File file = null;

 d.addActionListener(new ActionListener() //begins file choosing process

 @Override
 public void actionPerformed(ActionEvent arg0) 

 int returnVal = fc.showOpenDialog(inter);

 if (returnVal == JFileChooser.APPROVE_OPTION) 

 //processes file and displays name
 File file = fc.getSelectedFile();
 name.setName(file.getName());

 inter.add(name);
 inter.add(e);
 SwingUtilities.updateComponentTreeUI(inter);
 

 
 );

 e.addActionListener(new ActionListener() //returns the selected file

 @Override
 public void actionPerformed(ActionEvent arg0) 
 i = true;
 synchronized (e) 
 e.notify();
 
 
 );

 synchronized(e) 
 e.wait();
 

 //removes the button!
 inter.remove(d);
 inter.remove(e);
 SwingUtilities.updateComponentTreeUI(inter);

 if (i == true) 
 return file;
 
 return null;






 //Updates completed training list and awards points based on a spreadsheet exported from the database
 public static boolean updateTraining(File file) 

// still working on the processing
 if (file == null) 
 return false;
 else 
 System.out.println("Updated Training!!");
 return true;
 


//Updates the employee list using an employee list exported from the database
public static boolean updateEmployees(File file) 
 if (file == null) 
 return false;
 else 
 System.out.println("Updated Employees!!");
 return true;
 


//Creates and exports a spreadsheet with employee names and current points
public static boolean exportPoints() 
 System.out.println("Exported Points!");
 return true;

I included all of the code just in case.