Files size() method in Java with Examples

size() method of java.nio.file.Files help us to get the size of a file (in bytes). This method returns the file size, in bytes by taking the path of the file as a parameter. The size may differ from the actual size on the file system due to compression, support for sparse files, or other reasons. The size of files that are not regular files is implementation-specific and therefore unspecified. 

Syntax:

public static long size(Path path)
                 throws IOException

Parameters: This method accepts a parameter path which is the path to the file. 

Return value: This method returns the file size, in bytes. 

Exception: This method will throw following exceptions:

1. IOException if an I/O error occurs.
2. SecurityException in the case of the default provider, and a security manager is installed, its checkRead method denies read access to the file.

Below programs illustrate size(Path) method: 

Program 1:

Java

// Java program to demonstrate
// Files.size() method

import java.io.IOException;
import java.nio.file.*;

public class GFG {
    public static void main(String[] args)
        throws IOException
    {

        // create object of Path
        Path path
            = Paths.get("D:\\GIT_EWS_PROJECTS\\logger"
                        + "\\src\\logger"
                        + "\\GFG.java");

        // get File Size

        long result;

        result = Files.size(path);

        System.out.println("File " + path
                           + " Size = "
                           + result + " bytes");
    }
}

Output:

Program 2:

Java

// Java program to demonstrate
// Files.size() method

import java.io.IOException;
import java.nio.file.*;

public class GFG {
    public static void main(String[] args)
        throws IOException
    {

        // create object of Path
        Path path
            = Paths.get("D:\\User Aman\\"
                        + "Documents\\MobaXterm\\"
                        + "\\ArrayList.docx");
        // get File Size
        long result;
        result = Files.size(path);

        System.out.println("File " + path
                           + " Size = "
                           + result + " bytes");
    }
}

Output:

References: https://docs.oracle.com/javase/10/docs/api/java/nio/file/Files.html#size?(java.nio.file.Path)