Jotting #4: Revealing intent …

Java does not support Design-by-Contract (pre- and post-conditions, invariants) and asserts are really just a weak placebo.

Nevertheless, you can at least indicate your intentions to some degree with labels:

public void foo(Bar theX, ...) {
   pre_condition: { vetoArgument( null==theX, "Bar argument is null" ); }
   // some code
   post_condition: { ... }

where vetoArgument is some helper method to throw an IllegalArgumentException or the like.

Labels are a somewhat under-used feature of Java. But it’s still not the full DBC feature I’d like to see. Annotations will not be able to substitute for proper built-in language support. How long do we still have to wait?


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: