Problem & Solution
This example shows how to get a file’s size in bytes by using file.exists() and file.length() method of File class.
JAVA Program
import java.io.File; public class Main { public static long getFileSize(String filename) { File file = new File(filename); if (!file.exists() || !file.isFile()) { System.out.println("File doesn\'t exist"); return -1; } return file.length(); } public static void main(String[] args) { long size = getFileSize("c:/java.txt"); System.out.println("Filesize in bytes: " + size); } }
Output
The above code sample will produce the following result.To test this example, first create a text file ‘java.txt’ in ‘C’ drive.The size may vary depending upon the size of the file.
File size in bytes: 480