simple recursive app to recursively map a local directory as well as return its total size

FileRecursor.java

import java.io.*;
import java.util.HashMap;

class FileRecursor {
    private static HashMap<String, File> filesMap = new HashMap();
    private static long totalSize = 0;

    public static void main(String[] args) {
        System.out.println("==List all files in current directory and total size they occupy==");
        File folder = new File(".");
        System.out.println(statFiles(folder) / (1024) + " KB");
        System.out.println(filesMap);
    }

    /**
     * Returns the total size of a directory
     */
    public static long statFiles(File dir) {
        try {
            File[] listOfFiles = dir.listFiles();
            for (int i = 0; i < listOfFiles.length; i++) {
                File f = listOfFiles[i];
                totalSize += f.length();
                if (f.isDirectory() && !filesMap.containsKey(f.getPath())) {
                    filesMap.put(f.getPath(), f);
                    String isSymbolic = "";
                    if (isSymlink(f)) {
                        isSymbolic = "(symlink)";
                    }
                    System.out.println("===Directory contents for " + f + isSymbolic);
                    statFiles(f);
                } else {
                    System.out.println("     " + f.getName());
                }
            }
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
        return totalSize;
    }

    public static boolean isSymlink(File file) throws IOException {
        if (file == null)
            throw new NullPointerException("File must not be null");
        File canon;
        if (file.getParent() == null) {
            canon = file;
        } else {
            File canonDir = file.getParentFile().getCanonicalFile();
            canon = new File(canonDir, file.getName());
        }
        return !canon.getCanonicalFile().equals(canon.getAbsoluteFile());
    }
}