constant objects

Question

Why would I want to create a constant object? If I can't change any of its values wouldn't it be useless?

Answer 1

Let me ask you a question: Why are there constants in mathematics? Do they make sense there?

Answer 2

@Donatas: Ok, so I thought I would maybe elicit an answer from you by now.
Nevertheless, here's where constants are used: constants usually represent "given" values that are not "for discussion".
In programming these are e.g. default values, natural constants from physics, fixed system values as file names to load, how many times to attempt to reconnect to servers, timeouts etc.