用递归实现文件目录树状显示

import java.io.*;public class FileList {public static void main(String[] args) {File f = new File("d:/java/A");System.out.println(f.getName());tree(f, 0);}private static void tree(File file, int level) {File[] fileList = file.listFiles();String preStr = "";for(int i=0; i<level; i++) {preStr += " ";}for(int i=0; i<fileList.length; i++) {System.out.println(preStr + fileList[i].getName());if(fileList[i].isDirectory()) {tree(fileList[i], level + 1);}}}}