Some methods of the Java 19-13 file Class 2

1  PackageZl_file;2 3 ImportJava.io.File;4 Importjava.io.IOException;5 ImportJava.text.SimpleDateFormat;6 Importjava.util.Date;7 8 /*9  　　　  Judging function :Ten Public Boolean isdirectory (): Determines whether it is a directory (folder) One Public Boolean isfile (): Determines whether the file is A Public Boolean exists (): Determine if there is - Public Boolean CanRead (): Determines whether it is readable - Public Boolean canWrite (): Determines if writable the Public Boolean Ishidden (): Determines whether to hide -  　　　  Get features : - Public String GetAbsolutePath (): Gets the absolute path - Public String GetPath (): Get relative path + Public String GetName (): Get name - Public long Length (): Gets the length. Number of bytes + Public Long LastModified (): Gets the last modification time, in milliseconds this can be seen if someone has moved their files. A  　　　  Get features : at Public string[] list (): Gets an array of names for all files or folders under the specified directory - Public file[] Listfiles (): Gets the file array of all files or folders under the specified directory -  */ -  Public classFileDemo2 { -  -      Public Static voidMain (string[] args)throwsIOException { in         //Create a folder first -File file1 =NewFile ("H:\\demo\\test"); to file1.mkdirs (); +         //create a file on the path above -File file2 =NewFile ("H:\\demo\\test\\a.txt"); the file2.createnewfile (); *          $         //Public Boolean isdirectory (): Determines whether it is a directory (folder)Panax NotoginsengFile File3 =NewFile ("H:\\demo\\test\\a.txt"); -System.out.println (File3.isdirectory ());//false, the          +File file4 =NewFile ("H:\\demo\\test"); ASystem.out.println (File4.isdirectory ());//true the          +         //Public Boolean isfile (): Determines whether the file is -File file5 =NewFile ("H:\\demo\\test\\a.txt"); $System.out.println (File5.isfile ());//true $          -         //Public Boolean exists (): Determine if there is -File File6 =NewFile ("H:\\demo\\test\\a.txt"); theSystem.out.println (File6.isfile ());//true -File File7 =NewFile ("H:\\demo\\test\\b.txt");WuyiSystem.out.println (File7.isfile ());//false the          -         //Public Boolean CanRead (): Determines whether it is readable Wu         //Public Boolean canWrite (): Determines if writable -         //Public Boolean Ishidden (): Determines whether to hide AboutSystem.out.println (File6.canread ());//true $System.out.println (File6.canwrite ());//true -System.out.println (File6.ishidden ());//flase -          -         //Get features A         //Public String GetAbsolutePath (): Gets the absolute path +System.out.println (File6.getabsolutepath ());//H:\demo\test\a.txt the          -         //Public String GetPath (): Get relative path $System.out.println (File6.getpath ());//H:\demo\test\a.txt, in the program folder, there will be no drive letter the          the         //Public String GetName (): Get name theSystem.out.println (File6.getname ());//a.txt the          -         //Public long Length (): Gets the length. Number of bytes inSystem.out.println (File6.length ());//0, there's nothing inside. the          the         //Public Long LastModified (): Gets the last modified time, millisecond value AboutSystem.out.println (File6.lastmodified ());//1474975514541 the          the         //1474975514541 theDate d =NewDate (1474975514541L); +SimpleDateFormat SDF =NewSimpleDateFormat ("Yyyy-mm-dd HH:mm:ss"); -String s =Sdf.format (d); theSystem.out.println (s);//2016-09-27 19:25:14Bayi          the         //Advanced Access Features the         //Public string[] list (): Gets an array of names for all files or folders under the specified directory -File File =NewFile ("h:\\"); -string[] str = file.list ();//here is an array of all the folders under the H disk and the names of the files the         //need to traverse the          for(String s1:str) { theSystem.out.println (S1);//will get all the folders under the H disk and the name of the file the         } -          the         //Public file[] Listfiles (): Gets the file array of all files or folders under the specified directory theFile[] f = file.listfiles ();//The effect is similar to the above, except that the array type is file type the         //Traverse94          for(File fi:f) { theSystem.out.println (Fi.getname () +fi.length ()); the             //because it is of type file, you can call the file's method to see the properties of the files in it the         }        98     } About}

Some methods of the Java 19-13 file Class 2