TestFile.java

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