A.不使用递归： 　　import java.io.File;　　import java.util.LinkedList;　　public class FileSystem {　　public static void main(String[] args) {　　long a = System.currentTimeMillis();　　LinkedList list = new LinkedLi... [阅读全文]

package io; import java.io.*; public DocTree { File root = null; public DocTree(File f){ this.root = f; } public void showTree(File root, depth){ drawFile(root, depth); (!root.isFi... [阅读全文]