I'm working through the Java SE 7 programming activity and I'm having trouble sort of understanding how arguments work.

Here's the code:

     public class CopyFileTree implements FileVisitor<Path> {

private Path source;
private Path target;

public CopyFileTree(Path source, Path target) {
    this.source = source;
    this.target = target;
}

@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
    // Your code goes here
    Path newdir = target.resolve(source.relativize(dir));
    try {
        Files.copy(dir, newdir);
    } catch (FileAlreadyExistsException x) {
        // ignore
    } catch (IOException x) {
        System.err.format("Unable to create: %s: %s%n",
                newdir, x);
        return SKIP_SUBTREE;
    }

    return CONTINUE;
}

@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs
) {
    // Your code goes here
    Path newdir = target.resolve(source.relativize(file));
    try {
        Files.copy(file, newdir, REPLACE_EXISTING);
    } catch (IOException x) {
        System.err.format("Unable to copy: %s: %s%n", source, x);
    }

    return CONTINUE;
}

@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc
) {
    return CONTINUE;
}

@Override
public FileVisitResult visitFileFailed(Path file, IOException exc
) {
    if (exc instanceof FileSystemLoopException) {
        System.err.println("cycle detected: " + file);
    } else {
        System.err.format("Unable to copy: %s: %s%n", file, exc);
    }
    return CONTINUE;
}

}

It says to test this I need to enter arguments in properties of the project which I did? Can someone clarity what I'm doing wrong?