java判断两个文件夹是否存在相同的文件

public static void main(String[] args) {
??compare("D:/2-3-4/", "D:/2-3-5-1/");
?}

?public static void compare(String frompath, String topath) {
??Map<String,String> fromMap = new HashMap<String, String>();
??Map<String,String> toMap = new HashMap<String, String>();
??try {
???System.out.println("----------------------fromMap开始----------------------------");
???LinkedList list = new LinkedList();
???File dir = new File(frompath);
???File file[] = dir.listFiles();
???for (int i = 0; i < file.length; i++) {
????if (file[i].isDirectory())
?????list.add(file[i]);
????else{
?????fromMap.put(file[i].getName(),file[i].getName());
?????//System.out.println(file[i].getName());
????}
???}
???System.out.println("----------------------toMap开始----------------------------");
???dir = new File(topath);
???File[] tofile = dir.listFiles();
???for (int i = 0; i < tofile.length; i++) {
????if (tofile[i].isDirectory())//判断读到的是否是文件夹
?????list.add(tofile[i]);
????else{
?????toMap.put(tofile[i].getName(),tofile[i].getName());
?????//System.out.println(tofile[i].getName());
????}
?????
???}
???System.out.println("判断toMap中的值是否在fromMap中存在.");
???Iterator it = toMap.entrySet().iterator();
???while(it.hasNext()){
????Map.Entry<String, String> e = (Entry<String, String>) it.next();
????if(fromMap.containsKey(e.getKey())){
????}else{
?????System.out.println(e.getKey());
????}
???}
???System.out.println("判断fromMap中的值是否在toMap中存在.");
???Iterator it1 = fromMap.entrySet().iterator();
???while(it1.hasNext()){
????Map.Entry<String, String> e = (Entry<String, String>) it1.next();
????if(toMap.containsKey(e.getKey())){
????}else{
?????System.out.println(e.getKey());
????}
???}
??} catch (Exception e) {

???e.printStackTrace();
??}

?}