in future 从今以后，将来; in the future 未来

in future：

from now on 以后，今后 also for the future (becoming rare) 亦作 for the future（渐罕）

In future,be more careful with your money 以后用钱要更谨慎

in the future：

in time yet to come 在将来

Who can tell me what will happen in the future? 谁能知道将来会发生什么事？

in the distant future：

at a very much later time 在很久之后

Are you going to buy a house? Not now,perhaps in the distant future.你要买房子吗？现在不买，也许要在很久以后才买

in the near future:

soon 不久

in the not too distant future:

not next week,but quite soon 不太久之后

From LONGMAN contemporary english-chinese dictionary

"I hope they'll be more cautious in future," he observed.
他说："我希望他们今后能更慎重一些。"

The boy wants to become a philosopher in the future.
这个男孩想在将来成为一名哲学家。

in future是指很久以后的时间，有the的是不久以后的将来。
In furute,when I grow up, I want to be a teacher.
In the future