mac filled automatically setting the Eclipse Code

 

Eclipse -> Perferences -> Java -> Editor -> Content Assist in the following figure.

The auto activation triggers for java
content changed

.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ

And select Apply and Close.

 

 

reference:

https://blog.csdn.net/cloudyunmz/article/details/93403008