Cancellare contenuti da un file.txt

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Blackware

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1
Sono riuscito a creare il save e il load che funzionano perfettamente però c'è ancora un problema. Io voglio tenere conto di solo 3 valori (ovvero le prime tre righe). Per fare ciò ho bisogno di qualcosa per pulire il mio file (Altrimenti ogni volta che si clicca salva i contenuti verranno aggiunti e quindi non sarà possibile leggerli). La cancellazione ovviamente dovrà avvenire quando clicco il bottone SALVA.

L'evento del tasto salva sarà quindi:

1) Prendo i primi 3 valori dal file
2) Cancello il contenuto del file
3) Aggiorno i miei valori
4) Li rimetto nel file

Il problema sorge appunto, come detto prima, sul punto2
Qualche suggerimento?
Vi ringrazio

(Vi lascio qui sotto il codice)
Java:
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Image;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;

public class GUI extends JFrame {

    private JPanel contentPane;
    private JTextField textField;
    private JTextField textField_1;
    private JTextField textField_2;
    
    int Win;
    int Kill;
    int Death;
    double K_D;
    
    int contWin=0;
    int contKill=0;
    int contDeath=0;
    
    String S_Nome = "✉PostmanPat✉";
    String S_Rateo;
    String S_Kill;
    String S_Death;
    String S_Win;
    
    
    //Main

    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                try
                {
                    GUI frame = new GUI();
                    frame.setVisible(true);
                    frame.setExtendedState(frame.getExtendedState() | JFrame.MAXIMIZED_BOTH);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
    
    public void SaveToFile() {
        
        try {
            JOptionPane.showMessageDialog(null,"I dati sono stati inseriti correttamente.");
            FileWriter writer = new FileWriter("DarwinProject.txt", true);
            BufferedWriter bufferedWriter = new BufferedWriter(writer);
            
            String temp_Kill;
            String temp_Death;
            String temp_Win;
            
            FileReader reader = new FileReader("DarwinProject.txt");
            BufferedReader bufferedReader = new BufferedReader(reader);
            
            temp_Kill = bufferedReader.readLine();
            temp_Death = bufferedReader.readLine();
            temp_Win = bufferedReader.readLine();
            
            
            
            int x = Integer.parseInt(temp_Kill);
            int y = Integer.parseInt(temp_Death);
            int z = Integer.parseInt(temp_Win);
            
            x = x+Kill;
            y = y+Death;
            z = z+Win;
            
            S_Kill = Integer.toString(x);
            S_Death = Integer.toString(y);
            S_Win = Integer.toString(z);
            
            bufferedWriter.write(S_Kill);
            bufferedWriter.newLine();  // scrive una nuova linea
            bufferedWriter.write(S_Death);
            bufferedWriter.newLine();   // scrive una nuova linea
            bufferedWriter.write(S_Win);
            bufferedWriter.newLine();

            bufferedWriter.close();
            
        } catch (IOException e)
        {
            e.printStackTrace();
        }
    }
    
    public void K_D_Rateo(String a, String b)
    {   
        Double t1 = Double.parseDouble(a);
        Double t2 = Double.parseDouble(b);
        
        K_D = (t1+t2)/2;                    // Kill Death rateo
        
        S_Rateo = Double.toString(K_D);
    }

    public void LoadFromFile()
    {
        try (FileReader reader = new FileReader("DarwinProject.txt"))
        {
            BufferedReader bufferedReader = new BufferedReader(reader);

            String a = bufferedReader.readLine();
            String b = bufferedReader.readLine();
            String c = bufferedReader.readLine();
          
            
            K_D_Rateo(a,b);
            
            textField.setText(S_Nome);
            textField_1.setText(S_Rateo);
            textField_2.setText(c);
            
        } catch (IOException e)
        {
            e.printStackTrace();
        }
    }
    
    
    //GUI

    public GUI() {
        super("Darwin Project Stats Tracker");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 1920, 1080);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(null);
        setContentPane(contentPane);
        Image Background = new ImageIcon(this.getClass().getResource("/Background.png")).getImage();
        
        Image Layout = new ImageIcon(this.getClass().getResource("/Layout12.png")).getImage();
        
        textField = new JTextField();
        textField.setEditable(false);
        textField.setBounds(463, 480, 381, 38);
        contentPane.add(textField);
        textField.setColumns(10);
        
        textField_1 = new JTextField();
        textField_1.setEditable(false);
        textField_1.setColumns(10);
        textField_1.setBounds(463, 560, 381, 38);
        contentPane.add(textField_1);
        
        textField_2 = new JTextField();
        textField_2.setEditable(false);
        textField_2.setColumns(10);
        textField_2.setBounds(463, 642, 381, 38);
        contentPane.add(textField_2);
        
        JLabel lblNewLabel_0 = new JLabel("");
        lblNewLabel_0.setForeground(Color.WHITE);
        lblNewLabel_0.setFont(new Font("Microsoft YaHei UI Light", Font.BOLD, 21));
        lblNewLabel_0.setBounds(673, 364, 45, 30);
        contentPane.add(lblNewLabel_0);
        
        JLabel lblNewLabel_1 = new JLabel("");
        lblNewLabel_1.setForeground(Color.WHITE);
        lblNewLabel_1.setFont(new Font("Microsoft YaHei UI Light", Font.BOLD, 21));
        lblNewLabel_1.setBounds(343, 416, 38, 30);
        contentPane.add(lblNewLabel_1);
        
        JLabel lblNewLabel_2 = new JLabel("");
        lblNewLabel_2.setForeground(Color.WHITE);
        lblNewLabel_2.setFont(new Font("Microsoft YaHei UI Light", Font.BOLD, 21));
        lblNewLabel_2.setBounds(343, 364, 45, 30);
        contentPane.add(lblNewLabel_2);
        
        JLabel lblNewLabel_9 = new JLabel("");
        lblNewLabel_9.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent e)
            {   
                
                SaveToFile();
                lblNewLabel_1.setText("");
                lblNewLabel_2.setText("");
                lblNewLabel_0.setText("");
                
                
            }
        });
        
        lblNewLabel_9.setBounds(614, 691, 293, 71);
        contentPane.add(lblNewLabel_9);

        
        JLabel lblNewLabel_8 = new JLabel("");
        lblNewLabel_8.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent e) {
                LoadFromFile();
                
            }
        });
        lblNewLabel_8.setBounds(284, 691, 293, 71);
        contentPane.add(lblNewLabel_8);
        
        JLabel lblNewLabel_7 = new JLabel("");
        lblNewLabel_7.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent arg0) {
                Win+=1;
                contWin+=1;
                lblNewLabel_0.setText("x"+contWin);
            }
        });
        lblNewLabel_7.setBounds(614, 344, 293, 71);
        contentPane.add(lblNewLabel_7);
        
        JLabel lblNewLabel_6 = new JLabel("");
        lblNewLabel_6.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent e) {
                Death+=1;
                contDeath+=1;
                lblNewLabel_1.setText("x"+contDeath);
            }
        });
        lblNewLabel_6.setBounds(284, 395, 293, 71);
        contentPane.add(lblNewLabel_6);
        
        JLabel lblNewLabel_5 = new JLabel("");
        lblNewLabel_5.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent e)
            {
                Kill+=1;
                contKill+=1;
                lblNewLabel_2.setText("x"+contKill);
            }
        });
        lblNewLabel_5.setBounds(284, 344, 293, 71);
        contentPane.add(lblNewLabel_5);
        
        JLabel lblNewLabel_3 = new JLabel("");
        lblNewLabel_3.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent e) {
            }
        });
        lblNewLabel_3.setBounds(451, 745, 293, 71);
        contentPane.add(lblNewLabel_3);
        
        JLabel lblNewLabel_4 = new JLabel("");
        lblNewLabel_4.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent arg0) {               
                int scelta;
                scelta = JOptionPane.showConfirmDialog(null, "Sei sicuro/a di voler continuare?", "Conferma", JOptionPane.INFORMATION_MESSAGE);
                
                if(scelta == JOptionPane.YES_OPTION)
                {
                    contKill=0;
                    contDeath=0;
                    contWin=0;
                }
                else if(scelta == JOptionPane.NO_OPTION)
                {
                    JOptionPane.showMessageDialog(null,"Reinserire i dati.");
                    lblNewLabel_1.setText("");
                    lblNewLabel_2.setText("");
                    lblNewLabel_0.setText("");
                    contKill=0;
                    contDeath=0;
                    contWin=0;
                }
            }
        });
        lblNewLabel_4.setBounds(614, 395, 293, 71);
        contentPane.add(lblNewLabel_4);
        JLabel label = new JLabel("");
        label.setBounds(194, 304, 795, 524);
        contentPane.add(label);
        
        label.setIcon(new ImageIcon(Layout));
        
        JLabel lblNewLabel = new JLabel("");
        lblNewLabel.setBackground(Color.WHITE);
        
        lblNewLabel.setBounds(-8, -19, 1920, 1080);
        contentPane.add(lblNewLabel);
        lblNewLabel.setIcon(new ImageIcon(Background));
        
        Image Kill = new ImageIcon(this.getClass().getResource("/Kill1234.png")).getImage();
        lblNewLabel_5.setIcon(new ImageIcon(Kill));
        
        Image Inserisci = new ImageIcon(this.getClass().getResource("/Inserisci123456.png")).getImage();
        lblNewLabel_4.setIcon(new ImageIcon(Inserisci));
        
        Image Visualizza = new ImageIcon(this.getClass().getResource("/Visualizza.png")).getImage();
        lblNewLabel_3.setIcon(new ImageIcon(Visualizza));
        
        Image Death = new ImageIcon(this.getClass().getResource("/Death123.png")).getImage();
        lblNewLabel_6.setIcon(new ImageIcon(Death));
        
        Image Win = new ImageIcon(this.getClass().getResource("/Win.png")).getImage();
        lblNewLabel_7.setIcon(new ImageIcon(Win));
        
        Image Load = new ImageIcon(this.getClass().getResource("/Load.png")).getImage();
        lblNewLabel_8.setIcon(new ImageIcon(Load));
        
        Image Save = new ImageIcon(this.getClass().getResource("/Save.png")).getImage();
        lblNewLabel_9.setIcon(new ImageIcon(Save));
    }
}
 
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