Methods to my monitor

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;

public class Methods {
    static String path = System.getProperty("user.home") + File.separator
            + "OSBot" + File.separator + "data" + File.separator + "btm.txt";

    /*
     * Method needs to be used like so ScriptName,Accname,XP Gained,Xp-per-hour
     */

    public static void addAccount(String setting)
            throws IOException {
        File file = new File(path);
        FileWriter f = new FileWriter(file, true);

        RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw");
        FileChannel channel = randomAccessFile.getChannel();
        FileLock lock = channel.lock();
        f.write(setting + System.getProperty("line.separator"));
        lock.release();
        channel.close();
        randomAccessFile.close();
        f.close();
    }

    public static boolean statsAreValid() {
        return (new File((path)).exists());
    }

    public static void removeAccount(String acc) throws IOException {
        if (statsAreValid()) {
            FileInputStream fstream = new FileInputStream(path);
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    fstream));
            String strLine;
            StringBuilder fileContent = new StringBuilder();
            while ((strLine = br.readLine()) != null) {
                String lines[] = strLine.split(",");
                if (lines[1].equalsIgnoreCase(acc)) {
                    fileContent.append("");
                } else {
                    fileContent.append(strLine + System.lineSeparator());
                }
            }

            FileWriter fstreamWrite = new FileWriter((path));
            BufferedWriter out = new BufferedWriter(fstreamWrite);
            out.write(fileContent.toString());
            out.close();
            br.close();

        }
    }

    public static void updateAccount(String account_name, String settings)
            throws IOException {
        FileInputStream fstream = new FileInputStream(path);
        BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
        String strLine;
        StringBuilder fileContent = new StringBuilder();
        while ((strLine = br.readLine()) != null) {
            String lines[] = strLine.split(",");
            if (lines[1].equalsIgnoreCase(account_name)) {
                String newLine = settings;
                fileContent.append(newLine + System.lineSeparator());
            } else {
                fileContent.append(strLine + System.lineSeparator());
            }
        }

        FileWriter fstreamWrite = new FileWriter((path));
        BufferedWriter out = new BufferedWriter(fstreamWrite);
        out.write(fileContent.toString());
        out.close();
        br.close();
    }
}