Java traversal files in a folder

Source: Internet
Author: User

2 ways to traverse a folder in Java:

A. Do not use recursion:

Import Java.io.file;import Java.util.linkedlist;public class FileSystem {public static void main (string[] args) {                Long a = System.currenttimemillis ();        LinkedList list = new LinkedList ();        File dir = new file ("c:\\java\\");        File file[] = Dir.listfiles ();            for (int i = 0; i < file.length; i++) {if (File[i].isdirectory ()) List.add (File[i]);        Else System.out.println (File[i].getabsolutepath ());        } File tmp;            while (!list.isempty ()) {tmp = List.removefirst ();                if (Tmp.isdirectory ()) {file = Tmp.listfiles ();                if (file = = null) continue; for (int i = 0; i < file.length; i++) {if (File[i].isdirectory ()) List.add (f                    Ile[i]);                Else System.out.println (File[i].getabsolutepath ());          }  } else {System.out.println (Tmp.getabsolutepath ());    }} System.out.println (System.currenttimemillis ()-a);                       }}

B. Using recursion:

 Import Java.io.file;import Java.util.arraylist;public class FileSystem1 {private static ArrayList filelist         = new ArrayList ();        public static void Main (string[] args) {Long a = System.currenttimemillis ();        Refreshfilelist ("C:\\java");    System.out.println (System.currenttimemillis ()-a);         public static void Refreshfilelist (String strpath) {file Dir = new File (strpath);                 file[] files = dir.listfiles ();         if (files = = null) return; for (int i = 0; i < files.length; i++) {if (Files[i].isdirectory ()) {refreshfilelist (file             S[i].getabsolutepath ());                } else {String strFileName = Files[i].getabsolutepath (). toLowerCase ();                SYSTEM.OUT.PRINTLN ("---" +strfilename);                                Filelist.add (Files[i].getabsolutepath ()); }}} Conclusion: After testing, using recursive method B has a relatively good performance. 

Java traverse files in folder

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