This example shows how to get a file's size in bytes by using file.exists() and file.length() method of File class.
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);
}
}
Result:
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.