Java of Java io. File related methods

java. io. Use of file.

IO principle and stream classification.

File stream: FileInputStream, fileoutputstream, FileReader, filewriter

Cache stream: bufferedinputstream, bufferedoutputstream, BufferedReader, bufferedwriter

Conversion stream: inputstreamreader, ouputstreamreader

Standard input / output stream

Print stream

data stream

Object stream: involves serializing and deserializing objectinputstream and objectoutputstream

Random access file stream: randomacessfile

java. io. File class: an abstract representation of file and directory pathnames, which is platform independent.

File can be created, deleted, @ r_ 419_ 2452 @ files and directories, but file cannot access the file content itself. If you need to access the file content itself, you need to use input / output streams.

The file object can be passed as a parameter to the constructor.

Common construction methods of file class:

Access file name:

File detection:

Get general file information:

File operation related:

Directory operation related:

Recursively judge whether the file under a folder is a folder or a file.

Output:

F: \ test is the folder F: \ test \ file1 is the folder F: \ test \ File2 is the folder F: \ test \ file3 is the folder F: \ test \ file4 is the folder F: \ test \ test1 Txt is the file f: \ test \ test2 Txt is the file f: \ test \ test3 Txt is the file f: \ test \ test4 Txt is a file