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package io;

import java.io.File;

import java.util.LinkedList;

public class QueueTraversalFileTest {

public static void main(String[] args) {

File file=new File("E:\\");

Queue<File> queue=new Queue<File>();

listAllFiles(file, queue);

}

public static void listAllFiles(File file, Queue<File> queue) {

File[] files=file.listFiles(new FileTypeFilter());

if(files!=null){

for (File file2 : files) {

if(file2.exists()){

if(file2.isDirectory()) queue.enQueue(file2);

else

System.out.println(file2.getName());

}

}

while(!queue.isEmpty()){

File subdir=queue.deQueue();

File[] sundirs=subdir.listFiles(new FileTypeFilter());

if(sundirs!=null){

for (File file2 : sundirs) {

if(file2.exists()){

if(file2.isDirectory()) queue.enQueue(file2);

else

System.out.println(file2.getName());

}

}

}

}

}

}

}

class Queue<E>{

private LinkedList<E> link;

public Queue(){

link=new LinkedList<>();

}

public void enQueue(E e){

link.addFirst(e);

}

public E deQueue(){

return link.removeLast();

}

public int size(){

return link.size();

}

public boolean isEmpty(){

return link.isEmpty();

}

}