A Bayesian would consider the results of the experiments fixed and consider population parameters as stochasts. This in contrast to frequentist, who see the data as "just another sample in an endless stream of samples" and who see the population parameters as fixed (but unknown).
The logical Bayesian order would be:
1. define the prior distribution
2. collect data
3. use that data to update your prior distribution. After updating it is called the posterior distribution.
Mind you that a confidence interval is really different from a credible interval. A confidence interval relates to the sampling procedure. If you would take many samples and calculate a 95% confidence interval for each sample, you'd find that 95% of those intervals contain the population mean.
This is useful to for instance industrial quality departments. Those guys take many samples, and now they have the confidence that most of their estimates will be pretty close to the reality. They know that 95% of their estimates are close, but they can't say that about one specific estimate.
Compare this to rolling dice: if you roll 600 (fair) dice, your best guess is that 1/6, that is 100 dice, will roll a six. But if you someone has rolled 1 die, and asks you:
- "What is the probability that this throw was a 6 ?",
- the answer "Well, that is 1/6 or 16.6%" is wrong.
The die shows either a 6, or some other figure. So the probability is 1, or 0.
When asked before the throw what the probability of throwing a 6 is, a Bayesian would say "1/6" (based on prior information: everybody knows that a die has 6 sides), but a Frequestist would say "No idea" because frequentism is solely based on the data, not on priors.
Likewise, if you have only 1 sample (thus 1 confidence interval), you have no way to say how likely it is that the population mean is in that interval. It is either in it, or not. The probability is either 1, or 0.
If a frequentist rejects H0, this means that P(data|H0) is smaller than some threshold. He says "It is very unlikely to find these sort of data if H0 were true, therefore I assume that H0 is not true, thus H1 must be true". Therefore, in this framework, H0 and H1 must be mutually exclusive and cover all possibilities.
As far as I understand, some frequentist say that if H0 is rejected, this does not imply that H1 is formally accepted; others say that rejecting the one equals accepting the other.
Hypothesis testing in a Bayesian method is slightly different. The method is to see how good the data are predicted by Hypothesis A, or B, or C (no need to limit this to 2 hypotheses). The researcher could say: "Hypothesis A explains the data 3 x better than Hypothesis B and 50 times better than Hypothesis C".