Java basic file Class (11)

The Java.io.File class represents the System file name (path and file name).

Java.io.IOException: Input Output file stream exception handling class.

Common construction methods for the file class:

Public file (String pathname): Creates a file object with pathname as the path, and if pathname is a relative path, the default current path is stored in the system Properties User.dir.

Public file (String parent,string child): The parent path is parented, and children creates a File object for the sub-path.

The static property of file, string separator, stores the path delimiter for the current system.

File Class Common methods:

The file object can access the properties of the files

public boolean canRead ();

public boolean canWrite ();

public boolean exists ();

public boolean isdirectory ();

public boolean isfile ();

public boolean Ishidden ();

Public long lastmodified ();

public long length ();

Public String getName ();

Public String GetPath ();

Create an empty file or directory from the file object (in the case where the object refers to a document or directory that does not exist):

public Boolean CreateNewFile () throws IOException

public Boolean Delete ()

public boolean mkdir ()

public boolean mkdirs ()//Create a series of directories in the path

Example one:

Import Java.io.File;

Import java.io.IOException;

public class Myfileclass {

public static void Main (string[] args) {

String Separator=file.separator;

SYSTEM.OUT.PRINTLN (separator);

String filename= "MyFile.txt";

String directory= "Mydir1" +separator+ "Mydir2";

File F=new file (directory,filename);

if (f.exists ()) {

System.out.println (F.getparentfile ());

SYSTEM.OUT.PRINTLN ("FileName:" +f.getabsolutepath ());

SYSTEM.OUT.PRINTLN ("File Size:" +f.length ());

}else{

F.getparentfile (). Mkdirs ();

try{

F.createnewfile ();

}catch (IOException e) {

E.printstacktrace ();

}

}

}

}

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Java basic file Class (11)