in future和in the future 哪种用法对呢？还是两个都对？那又有什么区别呢

in the future强调将来，而in future意思是“今后，从今以后”，它强调是的从现在的以后。
例：
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。

"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。"

都对
in future是从说出这句话那一刻开始，就是“从现在开始”
in the future是比较远的将来

都有
in future 指不可预见的未来