File is a class which belongs to java.io package. As the name suggests File class can be used to point a File as well as a folder stored in any storage device.

How to use File class

• To check the availability of folder or file.
• To check the permission of folder or file.
• To create a blank file.
• To create a stream which points to specific named file which can be used to read/write some data

Program to create a new blank file.

File Name: CreateBlankFile.java

import java.io.*;

class CreateBlankFile 
{
	public static void main(String[] s) throws IOException
	{
		File f = new File("myFile.txt");
		f.createNewFile();
		System.out.println("File created!");	
	}	
}

Output:

Retrieve file information

File Name: FileMethodDemo.java

import java.io.File;
class FileMethodDemo 
{
	public static void main(String args[]) 
	{
		File f1 = new File("myFile.txt");
		System.out.println("File Name: " + f1.getName());
		System.out.println("Path: " + f1.getPath());
		System.out.println("Abs Path: " + f1.getAbsolutePath());
		System.out.println("Parent: " + f1.getParent());
		System.out.println(f1.exists() ? "exists" : "does not exist");
		System.out.println(f1.canWrite() ? "is writeable" : "is not writeable");
		System.out.println(f1.canRead() ? "is readable" : "is not readable");
		System.out.println("is " + (f1.isDirectory() ? "" : "not" + " a directory"));
		System.out.println(f1.isFile() ? "is normal file" : "might be a named pipe");
		System.out.println(f1.isAbsolute() ? "is absolute" : "is not absolute");
		System.out.println("File last modified: " + f1.lastModified());
		System.out.println("File size: " + f1.length() + " Bytes");
	}
}

Output: