Java's File class

1.File class overview

If we want to implement the IO operation, we must know the representation of the file on the hard disk. And Java provides a file class for us to use.

File: An abstract representation of the path name of a document or directory (folder).

How to construct a 2.File class

File (string pathname) Gets the file object file (string parent,string child) based on a path to a file object file (file parent, based on a directory and a sub-directory). String child) Gets a file object based on the parent file object and a sub-file/directory

Package Cn;import Java.io.file;public class Filedemo {public static void main (string[] args) {//file (String pathname): According to a Path to get a file object//package e:/demo/a.txt into an object file File = new file ("E:/demo/a.txt");//file (String parent,string Child) : Get the file object file File2 = new file ("E:/demo", "a.txt") according to a directory and a sub-file/directory;//file (file Parent,string child): Based on a parent file object and a sub-file/ The directory gets the file object file File3 = new file ("E:/demo"); File File4 = new file (file3, "a.txt");}}

Member Methods for 3.File

Creating features

Package Cn;import Java.io.file;import java.io.ioexception;/** * File class creation function * public boolean createnewfile () Create files * Public A Boolean mkdir () creates a folder, and if such a folder exists, creates only one level of folder * Public boolean mkdirs () to create a folder, you can create a multi-tier folder */public class Filedemo {public S tatic void Main (string[] args) throws Exception {//Create a folder under the E-disk directory Demofile file = new file ("E:/demo"); System.out.println ("Create folder:" +file.mkdir ());//Create a file in the E-disk directory demo A.txtfile file1 = new File ("E:/demo/a.txt"); System.out.println (File1.createnewfile ());//Create a a.txt file under the E-disk directory test/aaa files file2 = new file ("E:/text/aaa"); System.out.println (File2.mkdirs ());}}

Remove Features

Package Cn;import java.io.file;/** * File class Delete function * public boolean delete () delete file or folder * Note: * If you create a file or folder forgot to write the drive path, then the default The target path.  * Java deletion does not go through the Recycle Bin * To delete a folder, the folder cannot include files or folders * */public class FileDemo2 {public static void main (string[] args) {File file = new File ("E:/demo/a.txt"); System.out.println (File.delete ()); File File2 = new file ("E:/text/aaa"); System.out.println (File2.delete ());}}

This article is from the "11831428" blog, please be sure to keep this source http://11841428.blog.51cto.com/11831428/1864659

Java's File class