String是不可变的,但如果我们的工作需要字符串有很多变化,StringBuffer将是一个开销较低的选择。
String is immutable and if we are doing work that requires mutations, StringBuffer is a less costly alternative.
锯切速度曲线是不可变的,但进给速度曲线随进给机构杆长比的不同而变化。
The sawing speed curve is unchangeable, but the feed speed curve can be different with different length ratio of members of the feeding mechanism.
应用推荐