Java uses filefilter to filter files

Package cn.com; import Java. io. file; import Java. io. filefilter; import Java. util. arraylist; import Java. util. list; // Problem description: count the number of files that meet the conditions in a folder // 1 use filefilter to filter out files that meet the conditions // 2 if (file. isdirectory () | (file. isfile () & file. getname (). contains (keyword) // when the file is a directory or the file name contains a keyword, true is returned // 2.1 the file name contains the keyword, of course, one of the results // 2.2 if it is a directory, you need to call this method recursively later. // 3 use public class filetest {static int filescount = 0 recursively; static int folderscount = 0; List <File> filesarraylist = new arraylist <File> (); public static void main (string [] ARGs) {filetest = new filetest (); file folder = new file ("F: \ te "); string keyword = "test"; file [] filesresult = filetest. getfiles (folder, keyword); system. out. println ("A total of directories under this directory:" + folderscount + ""); system. out. println ("A total of files under this directory:" + filescount + ""); system. out. println ("Total files meeting the conditions:" + filesresult. length + "");} public file [] getfiles (file folder, final string keyword) {// 1 obtain the Directory and file [] filterfiles = folder. listfiles (New filefilter () {@ overridepublic Boolean accept (File file) {If (file. isfile () {filescount ++;} If (file. isdirectory () {folderscount ++;} If (file. isdirectory () | (file. isfile () & file. getname (). contains (keyword) {return true;} else {return false ;}}}); // 2 Add the file in the result 1 to the set and use the directory to iterate for (INT I = 0; I <filterfiles. length; I ++) {If (filterfiles [I]. isfile () {filesarraylist. add (filterfiles [I]);} If (filterfiles [I]. isdirectory () {getfiles (filterfiles [I], keyword) ;}}// 3 returned results file finalfiles [] = new file [filesarraylist. size ()]; filesarraylist. toarray (finalfiles); Return finalfiles ;}}