java io file

1.java IO Package File class, Java.io.File (file for managing files or directories; owning kit: java.io)1) File object, you only need to create a file object at the code level, without worrying about whether the object

Java IO streamWhen you run an error, save the exception to the fileBelow this instance, after running, enter the number, for the correct, if the input string, then error message, Save the wrong information//When you run an error, save the exception to the file//below this instance, after running, enter the number, for the correct, if the input string, then error

absolute path of the parent directory is returned (for example: ' E:\cat '), if the file itself is at the root of the disk, then the path of the disk is returned (for example: ' E:\ '). File file.getparentfile ()//gets the parent file that the return value is a file object. LongTime = File.lastmodified ();//returns th

/* The first demonstration method for File Reading */import Java. io. *; // import the IO package class filereaderdemo1 {public static void main (string [] ARGs) throws ioexception // an exception is thrown here {// upload a file to read the stream object, is associated with

1. NIO uses a way closer to the operating system to execute IO: Channels and buffers, as the name implies, data source data is transmitted by the buffer through the channel. 2. After JDK5, the raw IO system was optimized for NIO at the bottom, which can be found through Sun's published source code, but NIO is more systematic than IO. 3. In a little study of

IOException Ten: { 11: : Properties Prop = new properties (); : //import Info.txt byte stream information : prop.load (New FileInputStream ("Info.txt")); 16: : //Get program run times : String times = Prop.getproperty ("Times"); 19: : //If first run, set number of times is 1 : if (times = = null) : Prop.setproperty ("Times", "1"); : //If the number of times is greater than 5, pr

{ //file renameFile.renameto (NewFile ("src/file operation/123.chm")); } }} public classIndex { public Static voidmain (string[] Args) {File dir=NewFile ("src/new _ traverse _ change"); //get all the files (directories) under the directory and filter them,file[] fs = Dir.listfiles (Newfilenamefilter () {

{try {//Close input stream in.close (); } catch (Exception e) {e.printstacktrace (); } } } } 2, Java How to write filesPackage com.yyb.file; Import Java.io.File; Import Java.io.FileOutputStream; Import Java.io.OutputStream; / * * Write to File: * 1, locate the specified file * 2, the output stream according to

()) { Try{file.createnewfile (); }Catch(IOException e) {e.printstacktrace (); }} System.out.println ("File absolute path:" +File.getabsolutepath ()); LongLastmodified=file.lastmodified ();//Last modification TimeDateFormat df=NewSimpleDateFormat ("Yyyy-mm-dd HH:mm:ss"); String Lasttime=df.format (NewDate (lastmodified)); System.out.println ("Last modified:" +lasttime); System.out.println ("Length of Fi