Hjælp til noget java kode

Java kode 

 import java.awt.Color;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.io.FileNotFoundException;
 
 import javax.swing.*;
 
 
 public class Tilføjspiller extends JPanel {
     
     
     private JTextField afield, bfield, cfield;
     
         public Tilføjspiller(){
             
         JLabel label = new JLabel();
         label.setIcon(new ImageIcon("billed1.jpg"));
         
         JLabel alabel = new JLabel ("Navn");
         afield = new JTextField (15);
 
         JLabel blabel = new JLabel ("Nummer");
         bfield = new JTextField (15);
         
         
         JLabel clabel = new JLabel ("Position");
         cfield = new JTextField (15);
         
         
         JButton SendButton = new JButton("Tilføj Spiller");
         // add the listener to the jbutton to handle the "pressed" event
         SendButton.addActionListener(new ActionListener()
         {
           public void actionPerformed(ActionEvent e)
           {
             // display/center the jdialog when the button is pressed
                gemspiller();
           }
         });
         
         JButton Tilbage = new JButton("Tilbage til menu");
         // add the listener to the jbutton to handle the "pressed" event
         Tilbage.addActionListener(new ActionListener()
         {
           public void actionPerformed(ActionEvent e)
           {
               Main.addMenu();
           }
         });
     
         
         label.setBounds(50, 10, 400, 100); //billed
         alabel.setBounds(100, 150, 100, 40);
         afield.setBounds(200, 150, 100, 40);
         
         blabel.setBounds(100, 200, 100, 40);
         bfield.setBounds(200, 200, 100, 40);
         
         clabel.setBounds(100, 250, 100, 40);
         cfield.setBounds(200, 250, 100, 40);
         
         SendButton.setBounds(250, 380, 140, 40);
         Tilbage.setBounds(100, 380, 140, 40);
         
         this.setLayout(null);
         this.add(label);
         this.add(alabel);
         this.add(afield);
         this.add(blabel);
         this.add(bfield);
         this.add(clabel);
         this.add(cfield);
         this.add(SendButton);
         SendButton.setBackground(Color.RED);
         this.add(Tilbage);
         Tilbage.setBackground(Color.RED);
         this.setBackground(Color.BLACK);
         this.setSize(500, 500);
         this.setVisible(true);
         
     }
         
         private void gemspiller() {
             try {
                 Gemspiller.gem(afield.getText(), bfield.getText(), cfield.getText());
             } catch (FileNotFoundException e) {
                 e.printStackTrace();
             }
         }
     
 }

Java kode 

 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.PrintStream;
 
 
 public class Gemspiller {
     
         public static String filename = "Spiller.txt";
         
         public static void gem(String name, String nummer, String position) throws FileNotFoundException {
         
             PrintStream output = new PrintStream(new File(filename));
             
             output.println(name + " | " + nummer + " | " + position + " |");
         }
         
 }