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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 does not exist");
            return -1;
        }
        return file.length();
    }
    public static void main(String[] args) {
        long size = getFileSize("c:/java.txt");
        System.out.println("java.txt file size is: " + size);
    }
}

java.txt file size is: 480