Java program for copying files

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FileCopyUsingFOS.java

import java.io.*;
class FileCopyUsingFOS 
{
	public static void main(String[] args) throws FileNotFoundException, IOException
	{
		// Declare the variables
		FileInputStream fis = null;
		FileOutputStream fos = null;
		int fileSize = 0, data = 0;
        
		// Initialize the variables
		fis = new FileInputStream("source.txt");

		// Check in that  file data is available or not
		fileSize = fis.available();
		if (fileSize == 0)
		{
			System.out.println("Sorry, this file is empty.");
			fis.close();
			return;
		}

		// If file is not empty, initialse fos
		fos = new FileOutputStream("dest.txt");

		while ( (data = fis.read()) != -1)
		{
			fos.write(data);
		}

		// store the value from buffer to dest file
		fos.flush();

        System.out.println("File Copied.");
		// close the connection
		fos.close();
		fis.close();
	}
}