java例程练习（用递归方法列出文件目录）

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