The File class foundation for Java IO streams

Package IO;

Import Java.io.File;
Import java.io.IOException;

public class FileIO {

/**
* Build and get file name information
* @param args
*/
public static void FileName (string[] args) {
SYSTEM.OUT.PRINTLN ("Path delimiter:" +file.pathseparator); Path delimiter
System.out.println ("Name delimiter:" +file.separator);//Name delimiter

Relative path to the project as the starting path to find the corresponding file for example: 1.jpg
String path = "img"; Relative path
String name = "1.jpg";

Absolute path find the corresponding file from your computer's hard drive for example: C:\Users\Yonim\Pictures\Camera roll\1.jpg
In Java, "\" is a special character that needs to be deserialized.
String path2 = "C:\\users\\yonim\\pictures\\camera roll\\2.jpg";
String name2 = "";


File File = new file (path,name); This is the constructor that creates a relative path
File =new file (new file (path), name);//The second way of building

System.out.println ("Find file Name:" +file.getname ());
System.out.println ("Find file path:" +file.getpath ());

Constructors created with an absolute path

File F = new file (path2);
System.out.println ("File name for absolute path:" +f.getname ());
System.out.println ("File path to Absolute path:" +f.getpath ());
SYSTEM.OUT.PRINTLN ("Upper-level directory:" +f.getparent ());//If there is no upper-level directory returned empty
File URL = new file ("Users\\yonim\\pictures\\camera roll\\2.jpg");

Drive letter with the drive letter of the project file name as the absolute path in case the file does not have a drive letter
System.out.println ("File name for absolute path" +url.getabsolutepath ());

}

/**
* Determine file information
*/
public static void Isfile () {

String path = "img";
String name = "1.jpg";

File File = new file (path,name);

System.out.println (File.exists ()); Determines whether a file or folder exists and is writable, exists, and is writable to return true

/**
* Determines whether the file, when present, returns true
* Returns False when it is not a file or does not exist
*/
if (File.isfile ()) {//whether the file
SYSTEM.OUT.PRINTLN ("Existence of this file");
}else if (file.isdirectory ()) {//whether the folder
System.out.println ("is a folder");
}else{
SYSTEM.OUT.PRINTLN ("File does not exist");
}

/**
* Determine if absolute path
* Yes returns true otherwise returns false
*/
if (File.isabsolute ()) {
System.out.println ("is absolute path");
}else{
SYSTEM.OUT.PRINTLN ("relative path");
}

/**
* File size can be used to determine whether a file or a folder
* File.length cannot read folder size
*/
if (File.length () >0) {
System.out.println (File.getname () + "File size:" +file.length () + "byte");
}

}

/**
* Create and delete file information
* @throws IOException
*/
public static void NewFile () throws ioexception{

String Path = "D:\\myimg";
String name = "1.jpg";
File File = new file (path,name);

If it is not a file
if (!file.exists ()) {
Returns false if it exists
System.out.println ("Whether to create success:" +file.createnewfile ());
}

deleting files
if (File.delete ()) {
System.out.println ("delete succeeded");
}else{
System.out.println ("Delete error, file cannot be deleted");
}



}


/**
* Operating Directory
*/
public static void Operfile () {

String Path = "D:\\myimg\\test";
String name = "3.jpg";

File File = new file (path,name);
if (File.mkdir ()) {//If there is no parent directory, you cannot create

}

if (File.mkdirs ()) {//If no parent directory is created together with parent directory

}
}


public static void Main (string[] args) {

}



}

The File class foundation for Java IO streams