import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

// Klassen CopyFile är bara en hållare för main-metoden
class CopyFile {
    public static void main(String[] args) {
        if (args.length != 2) {
            System.err.println("Skriv: java CopyFile källfil målfil");
            System.exit(1);
        }
        try {   
            File srcFile = new File(args[0]);
            File destFile = new File(args[1]);
            FileInputStream srcStream = new FileInputStream(srcFile); 
            FileOutputStream destStream = new FileOutputStream(destFile);
            int c;
            while ((c = srcStream.read()) != -1) {
                destStream.write(c);
            }
            srcStream.close(); 
            destStream.close();
            System.exit(0);
        } // try
        catch (FileNotFoundException e) {
            System.err.println("Kunde inte öppna filen: " + e.getMessage());
            System.exit(1);
        }
        catch (IOException e) {
            System.err.println("I/O error: " + e.getMessage());
            System.exit(1);
        }
    } // main
} // CopyFile