Method for delete some input string on a input path for a certain file

Main.java

public class Main {
    public static void main(String[] args) {}

    public static void add(String fileName, String text) throws FileNotFoundException, IOException {
        RandomAccessFile rafile = new RandomAccessFile(new File(fileName), "rw");
        rafile.seek(0);
        rafile.write(text.getBytes());
        rafile.close();
    }

    public static void append(String fileName, String text) throws FileNotFoundException, IOException {
        File f = new File(fileName);
        long fileLength = f.length();
        RandomAccessFile rafile = new RandomAccessFile(f, "rw");
        rafile.seek(fileLength);
        rafile.writeBytes(text);
        rafile.close();
    }

    public static void append(String fileName, byte[] bytes) throws FileNotFoundException, IOException {
        File f = new File(fileName);
        long fileLength = f.length();
        RandomAccessFile rafile = new RandomAccessFile(f, "rw");
        rafile.seek(fileLength);
        rafile.write(bytes);
        rafile.close();
    }

    public static void addRootNode(String path) throws FileNotFoundException, IOException {
        //Locate the file
        File file = new File(path);
        //Create a temporary file (avoid memory call)
        File temp = File.createTempFile("file", ".txt", file.getParentFile());
        //Determine the charset
        String charset = "UTF-8";
        //Open file
        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), charset));
        //Open the temp file for writing
        PrintWriter writer = new PrintWriter(new OutputStreamWriter(new FileOutputStream(temp), charset));
        //Read line by line (not good) generate minimum O(n)

        reader.close();
        writer.close();

        file.delete();
        temp.renameTo(file);

    }

    public static void copyFile(String src, String temp) {
        InputStream inStream = null;
        OutputStream outStream = null;

        try {

            File afile = new File(src);
            File bfile = new File(temp);

            inStream = new FileInputStream(afile);
            outStream = new FileOutputStream(bfile);

            byte[] buffer = new byte[1024];

            int length;
            //copy the file content in bytes 
            while ((length = inStream.read(buffer)) > 0) {
                outStream.write(buffer, 0, length);
            }

            inStream.close();
            outStream.close();

            System.out.println("File is copied successful!");

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void removeCertainLineFromFile(String path, String delete) throws FileNotFoundException, IOException {
        //Locate the file
        File file = new File(path);
        //Create a temporary file (avoid memory call)
        File temp = File.createTempFile("file", ".txt", file.getParentFile());
        //Determine the charset
        String charset = "UTF-8";
        //Open file
        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), charset));
        //Open the temp file for writing
        PrintWriter writer = new PrintWriter(new OutputStreamWriter(new FileOutputStream(temp), charset));
        //Read line by line (not good) generate minimum O(n)
        for (String line; (line = reader.readLine()) != null;) {
            //Determine the string from the file
            line = line.replace(delete, "\n");
            writer.write(line);
        }

        reader.close();
        writer.close();

        file.delete();
        temp.renameTo(file);

    }
}