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This article is about how to use the File class in java. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Need to import header file

File f=new File (a) / / an is the address. If it is\, two\, "D:\ java_work\ ja.txt" are required, and if / only one is needed.

Rename operation:

F.renameTo (new File ("D:\ java_work\ jaj.txt")) / / ja is renamed to jaj

Default path:

System.getProperty ("user.dir"); / / the path where the eclipse project is located

Create a new file:

File f2 = new File ("gg.txt")

F2.createNewFile (); / / A new txt document is created under the default path of the project, and a txt document is also created under the eclipse project.

Document operation

System.out.println (f2.exists ()); / / whether the file exists

System.out.println (f2.isDirectory ()); / / whether the file is a directory

System.out.println (f2.isFile ()); / / whether it is a file or not

System.out.println (new Date (f2.lastModified (); / / date the file was last modified

System.out.println (f2.length ()); / / File size

System.out.println (f2.getName ()); / / File name

System.out.println (f2.getPath ()); / / the directory path of the file

Corresponding results:

True

False

True

Tue Jul 09 19:51:37 GMT+08:00 2019

six

Gg.txt

D:\ java_work\ gg.txt

Delete the file:

F2.delete ()

Catalogue

Detect the existence of the directory:

.mkdir ()

File f3 = new File ("DVR / Movie / Mandarin / mainland")

System.out.println (f3.mkdir ()); / / if one of the directory structures does not exist, it will not be created successfully and a Boolean value will be returned

Create a directory:

.mkdirs ()

File f3 = new File ("DVR / Movie / Mandarin / mainland")

As long as one exists in the f3.mkdirs () / / directory, it will be created successfully. The return values are boolean types true and false.

Boolean flag=f3.mkdirs ()

System.out.println (flag) / / true

Thank you for reading! This is the end of this article on "how to use File classes in java". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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