Переименование файлов и архивация

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
 
public class Main {
 
    public static void main(String[] args) {
        try {
            rename(new File("путь к директории"), new FileWriter("тут указываем путь и название файла куда выгрузить результат"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 
    public static void rename(File dir, FileWriter fw) throws IOException {
        StringBuilder sb = new StringBuilder();
        int name = 1;
        try {
            for (File file : dir.listFiles()) {
                if (file.getName().matches(".*\\.txt")) {
                    System.out.println("old name - " + file.getName());
                    sb.append(file.getName()).append(System.getProperty("line.separator"));
                    file.renameTo(new File(String.valueOf(name) + ".txt"));
                    name++;
                }
            }
            fw.write(sb.toString());
        } finally {
            fw.close();
        }
    }
}

 rename(new File("C:\b"), new FileWriter("C:\r.txt"));

/**
     * This method save a list of tasks to file in zip format
     * 
     * @param path
     *            to the file
     * @param tasks
     *            a list of task for saving
     * @return count of saved task
     * @throws IOException
     */
    public static int saveToZipFile(String path, List<Task> tasks)
            throws IOException {
        ZipOutputStream zipStream = new ZipOutputStream(new FileOutputStream(
                path));
        String pathToTextFile = String.valueOf(path.toCharArray(), 0,
                path.length() - 3);
 
        pathToTextFile += "forZip.txt";
        int count = saveToTextFile(pathToTextFile, tasks);
        File file = new File(pathToTextFile);
 
        ZipEntry entry = new ZipEntry(pathToTextFile);
        zipStream.putNextEntry(entry);
        byte[] bytes = getBytesFromFile(file);
        zipStream.write(bytes);
        zipStream.flush();
 
        file.delete();
 
        zipStream.close();
        return count;
    }

/**
     * This method parse a zip file, and added a find tasks in file to the
     * collection.
     * 
     * @param path
     *            - string path to the xml-file
     * @param tasks
     *            - reference to collection of the tasks for added.
     * @return number of added tasks.
     * @throws IOException
     * @throws ParseException
     */
    public static int loadFromZipFile(String path, List<Task> tasks)
            throws IOException, ParseException {
        ZipInputStream zipStream = new ZipInputStream(new FileInputStream(path));
        ZipEntry entry = zipStream.getNextEntry();
 
        FileOutputStream fout = new FileOutputStream(entry.getName());
        for (int c = zipStream.read(); c != -1; c = zipStream.read()) {
            fout.write(c);
        }
        zipStream.closeEntry();
 
        fout.close();
        zipStream.close();
 
        int count = loadFromTextFile(entry.getName(), tasks);
        File file = new File(entry.getName());
        file.delete();
 
        return count;
    }

new File("C:" + File.seporator + [fileName]) ;

new File("C:" + File.seporator + [fileName]) ;

rename(new File("C:/b"), new FileWriter("C:/r.txt"));

rename(new File("C:\\b"), new FileWriter("C:\\r.txt"));

rename(new File("C:/b"), new FileWriter("C:/r.txt"));

rename(new File("C:\\b"), new FileWriter("C:\\r.txt"));

System.out.println(File.separator);

String filesep = File.separator;
System.out.println(new File("c:" + filesep + "любая папка").getAbsolutePath());

import java.awt.List;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.ParseException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
 
 
public class Task {
 
    public static int arhivation (String path, List<Task> tasks) //The type List is not generic; it cannot be                   //parameterized with arguments <Task>
 
            throws IOException {
        ZipOutputStream zipStream = new ZipOutputStream(new FileOutputStream(
                path));
        String pathToTextFile = String.valueOf(path.toCharArray(), 0,
                path.length() - 3);
 
        pathToTextFile += "forZip.txt";
        int count = saveToTextFile(pathToTextFile, tasks);
        File file = new File(pathToTextFile);
 
        ZipEntry entry = new ZipEntry(pathToTextFile);
        zipStream.putNextEntry(entry);
        byte[] bytes = getBytesFromFile(file); //The method getBytesFromFile(File) is undefined for the type Task
        zipStream.write(bytes);
        zipStream.flush();
 
        file.delete();
 
        zipStream.close();
        return count;
    }
    public static int loadFromZipFile(String path, List<Task> tasks) //The type List is not generic; it cannot be                   //parameterized with arguments <Task>
            throws IOException, ParseException {
        ZipInputStream zipStream = new ZipInputStream(new FileInputStream(path));
        ZipEntry entry = zipStream.getNextEntry();
 
        FileOutputStream fout = new FileOutputStream(entry.getName());
        for (int c = zipStream.read(); c != -1; c = zipStream.read()) {
            fout.write(c);
        }
        zipStream.closeEntry();
 
        fout.close();
        zipStream.close();
 
        int count = loadFromTextFile(entry.getName(), tasks);
        File file = new File(entry.getName());
        file.delete();
 
        return count;
    }
    }