Java Notes Collation (10), file in Java

The file class provides a series of operational methods for reading and writing to directories and files

Create:

 Public classFileDemo01 { Public Static voidMain (string[] args) {Try {            //Create a fileFile File =NewFile ("FileName.txt"); if(File.createnewfile ()) {System.out.println ("Created successfully"); } Else{System.out.println ("Create Failed"); }            //Create a folderFile dir =NewFile ("DirName"); if(Dir.mkdir ()) {System.out.println ("Created successfully"); } Else{System.out.println ("Create not successful"); }            //Create a multi -level catalogFile dirs =NewFile ("Firstdir\\seconddir\\thirddir"); if(Dirs.mkdirs ()) {System.out.println ("Created successfully"); } Else{System.out.println ("Create not successful"); }        } Catch(IOException e) {e.printstacktrace (); }    }}

Delete

 Public classFileDemo01 { Public Static voidMain (string[] args) {//Deleting FilesFile FileName =NewFile ("D:\\java_workspace\\hellofile\\filename.txt"); if(Filename.delete ()) {System.out.println ("Delete Succeeded"); } Else{System.out.println ("Delete Failed"); }        //Delete directory, need this directory is emptyFile dir =NewFile ("D:\\java_workspace\\hellofile\\firstdir\\seconddir\\thirddir"); if(Dir.delete ()) {System.out.println ("Delete Succeeded"); } Else{System.out.println ("Delete Failed"); }        //Delete directory when exitingFile Dir2 =NewFile ("D:\\java_workspace\\hellofile\\firstdir\\seconddir");    Dir2.deleteonexit (); }}

Renaming

 Public classFileDemo01 { Public Static voidMain (string[] args)throwsIOException {File oldFile=NewFile ("C:\\name1.txt"); File NewFile=NewFile ("C:\\name2.txt"); //determines whether the file exists, if it does not exist, creates if it exists, prompts        if(!oldfile.exists ())            {Oldfile.createnewfile (); System.out.println ("Created successfully"); } Else{System.out.println ("File already exists"); }        //If the rename succeeds, the prompt succeeds or the prompt fails        if(Oldfile.renameto (newFile)) {System.out.println ("Rename succeeded"); } Else{System.out.println ("Renaming failed"); }    }}

In fact, the Renameto () method can also move folders, but there will be many problems under Windows, use caution, details click: http://xiaoych.iteye.com/blog/149328

Other methods

 Public classFileDemo01 { Public Static voidMain (string[] args)throwsIOException {File folder=NewFile ("D:/test/directory1/directory11"); File File=NewFile ("D:/test/directory1/directory11/file111.txt"); //System.out.println (Folder.mkdirs ()); //System.out.println (File.createnewfile ());        /*** Gets the name of the file object or the path returns a String * output: * Object Name: Directory11 * Object name: File111.txt *          */System.out.println ("Object Name:" +folder.getname ()); System.out.println ("Object Name:" +file.getname ()); /*** Gets the absolute path of the file object returns a String * output: * Absolute path: D:\test\Directory1\Directory11 * Absolute path: d:\ Test\directory1\directory11\file111.txt*/System.out.println ("Absolute path:" +Folder.getabsolutepath ()); System.out.println ("Absolute path:" +File.getabsolutepath ()); /*** Gets the path name of the file object returns the String * Output: * path name: D:\test\Directory1\Directory11 * path name: D:\test\Directory1\Directory11\File111.txt*/System.out.println ("Path name:" +Folder.getpath ()); System.out.println ("Path name:" +File.getpath ()); /*** Gets the parent directory of the file object returns a String * output: * Parent directory Name: D:\test\Directory1 * Parent directory Name: D:\test\Directory 1\directory11*/System.out.println ("Parent directory Name:" +folder.getparent ()); System.out.println ("Parent directory Name:" +file.getparent ()); /*** See if File object exists return Boolean * output: * True*/System.out.println (Folder.exists ()); /*** See if the file object is readable and writable returns a Boolean * return result: * readable * writable*/        if(File.canread ()) {System.out.println ("Readable"); }        if(File.canwrite ()) {System.out.println ("Writable"); }                /*** View the length of the file object return long * output result * 0kb*/System.out.println (file.length ()+ "KB"); /*** Return directory all sub-files and subdirectories array return file[] * Output Result: * Directory1 * Directory2 * Directory3 */File NewFile=NewFile ("D:/test"); File[] FileList=Newfile.listfiles ();  for(inti = 0; i < filelist.length; i++) {System.out.println (Filelist[i].getname ()); }    }}

Java Notes Collation (10), file in Java