OO Techniques & Universal Best Practices

[Gibran Castillo]

Matthias,

What techniques for creating pro-quality OO code that can stand the test of time do you use in your book?  I would love to review them and apply the ones I am not aware of ...

What universal best practices for object design do you provide in your book?  I would love to elevate my coding style by mastering the universal best practices described in your book ...

Why are immutable objects more secure and reliable?  Do you use immutable objects in your book?

Thanks,
Gibran

[Campbell Ritchie]

Gibran Castillo wrote:. . . Do you use immutable objects in your book? . . .

I would hope they do.

Immutable objects can safely be interned and shared, without any need for copying or using the clone() method. So, it might appear expensive to create multiple objects, but they can be more economical on space because duplicates are not necessary. Similarly, there is no need to take defensive copies.
Another advantage of immutable objects is that they are implicitly t‍hread‑safe.

[Knute Snortum]

Campbell Ritchie wrote:

Gibran Castillo wrote:. . . Do you use immutable objects in your book? . . .

I would hope they do.

It looks like they cover the subject:

https://livebook.manning.com/book/object-design-style-guide/chapter-1/44

[Campbell Ritchie]

Follow that to §4.4 and you can see how an object can sneakily change its state if it isn't written properly.

[Matthias Noback]

Some useful answers have been provided here already. Yes, immutability is a central concept. The underlying design concept is to make objects predictable by making them recognizable; making it very clear what to expect from them. E.g. how you can use them, what they will do when you call them (give you a piece of information, or produce some kind of side-effect), etc.

[Gibran Castillo]

I would love to be awarded a copy of your book to apply your best practices and principles for coding.  I'll become a much better developer.