File class Retrieve Metadata of File

Almost all the java.io package classes are streams. A stream is a carrier of data. To carry data, even sockets, use I/O streams. Infact, the methods getInputStream() and getOutputStream() of java.net.Socket returns an object of InputStream class and OutputStream class.

InputStreamReader and OutputStreamWriter are non-stream classes. They are not streams; they are converters or wrappers between input streams and output streams.

One more non-stream class in java.io package is File. Using this class, the properties of a file can be obtained like the file has got write permission or when the file is created etc.

Two programs are given using File class.

1. File class – Retrieving Metadata of FileRetrieving File Metada
2. File class – Changing File Properties

Retrieving File Metadata

The following program retrieves file metadata using different methods of File class.

import java.io.*;
public class FileMetaData   
{
  public static void main(String args[ ] ) throws IOException 
  {                                                           		
    System.out.println("pathSeparatorChar = " + File.pathSeparatorChar); 
    System.out.println("separatorChar = " + File.separatorChar);     
			                   
    File file1 = new File("pqr.txt"); 
    System.out.println("getName(): " + file1.getName());		
			
    System.out.println("getAbsolutePath(): " + file1.getAbsolutePath()) ;		
    System.out.println("canRead(): " + file1.canRead()) ;
    System.out.println("canWrite(): " + file1.canWrite()) ;
    System.out.println("isFile(): " + file1.isFile()) ;		
    System.out.println("isDirectory: " + file1.isDirectory()) ;		
    System.out.println("File last modified date: " + file1.lastModified()); 
    System.out.println("File size: " + file1.length() + " Bytes");       
    System.out.println("File exists(): " + file1.exists());		
  }   
}

Output screenshot of File class Retrieve Metadata of File