I saw a lot of complicated processing methods on csdn. In fact, two steps are enough:
1.Window-->Preferences
2.Java-->Editor-->Content Assist
(1) Modify Auto activation triggers for Java
.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_
(2)勾选Disable insertion triggers except 'Enter'
Of course, this is what I think is a relatively simple and fast method, and of course there are other advanced methods:
See https://blog.csdn.net/m0_37468234/article/details/80249241