Premise:
"But Java programs are still considerably slower than those written for a particular operating system, just as amphibious creatures are not as good on land as mammals or as good in water as fish."
Hypothesis: Java programs are faster than programs written for Windows.

no

Premise:
"The theme of the century's second half was liberation."
Hypothesis: Liberation isn't a theme in the century's second half.

no

Premise:
"no i'm sure you know that's one thing you don't do"
Hypothesis: I know you know that that's a bad thing to do.
it is not possible to tell