File class-casual

1 package IO; 2 3 Import Java. io. file; 4 Import Java. io. filenotfoundexception; 5 import Java. io. filereader; 6 Import Java. io. filewriter; 7 Import Java. io. filenamefilter; 8 Import Java. io. ioexception; 9 Import Java. io. reader; 10 Import Java. io. writer; 11 import Java. util. list; 12 13 public class file class {14 15/** read string output to TXT text 16 * @ Param ARGs 17 * @ throws ioexception 18 */19 public static void main (string [] ARGs) throws ioexception {20 // method 1 21 // file = new file ("D: \ new.txt "); 22 // Method 2: 23 // file file2 = new file ("D: \", "1.txt "); 24 // method 3: 25 // file file3 = new file ("d :\\"); 26 // file file4 = new file (file3, "1.txt "); 27 // These three methods have the same effect 28 29 // if a file exists, no 30 // file file2 = new file ("D: \ new \ a.txt "); 31 // system. out. println ("creatnewfile:" + file2.createnewfile (); 32 // create a folder, and return true if it already exists, false 33 // file = new file ("D: \ new1"); 34 // system. out. println ("mkdir:" + file. mkdir (); 35 36 // create a new folder at multiple levels. If a new folder exists, false is returned. 37 // file = new file ("D: \ newmu \ BBB "); 38 // system. out. println ("mkdirs:" + file. mkdirs (); 39 // delete a file without leaving the recycle bin 40 // file = new file ("D: \ 1.txt"); 41 // system. out. println ("filedelete:" + file. delete (); 42 // Delete the folder 43 // file = new file ("D: \ newmu \ BBB"); 44 // file. delete (); 45 // When deleting folders at multiple levels, you must first Delete the sub-layer file and folder 46 47 // file method. renameto (File file); if the path is the same, the renamed path is different, that is, the renamed + cut 48/* judgment function 49 * isdirectory () 50 * isfile () 51 * exists () 52 * Canread () 53 * canwrite () 54 * ishidder () 55 * getabsolutepath () 56 * getpath () 57 * getname () 58 * length () 59 * lastmodified () 60*61 * string list () return the name Array under the directory 62 * file [] listfiles () return the file array 63*64 */65 // file = new file ("D: \"); 66 // string [] list = file. list (); 67 // For (string S: List) {68 // system. out. println (s); 69 //} 70 71 // file = new file ("D: \"); 72 // file [] list = file. listfiles (); 73 // For (File S: List) {74 // system. out. println (S. getname () + "" + S. getabsolutepath (); 75 //} 76 // 77 // file name filter 78 // string [] list (filenamefilter filter) 79 // string [] listfiles (filenamefilter filter) 80 // output file 81 ending with TXT // file = new file ("D: \"); 82 // file [] list = file. listfiles (); 83 // For (file F: List) {84 // If (F. isfile () {85 // If (F. getname (). endswith (". TXT ") {86 // system. out. println (F. getname (); 87 //} 88 //} 89 // 90 //} 91 92 file = new file ("D :\\"); 93 string [] list = file. list (New filenamefilter () {94 95 @ override 96 public Boolean accept (File Dir, string name) {97 file = new file (Dir, name ); 98 // Boolean flag = file. isfile (); 99 // Boolean flag2 = Name. endswith (". TXT "); 100 // return flag & flag2; 101 return file. isfile () & name. endswith (". TXT "); 102} 103}); 104 for (string S: List) {105 system. out. println (s); 106} 107 108} 109 110}

 

File class-casual