偏好设置 -> General -> Editors -> File Associations
.xml -> 设置XML Editor为default
Keys 中查找 Content Assist
Java -> Editor -> Content Assist
abcdefghijklmnopqrstuvwxyz(,.
from:印象笔记 http://app.yinxiang.com/l/AAoIuuoQdupDZ7B9Mr9ro4AnDNDn4Ll9Hp0/
原文：http://www.cnblogs.com/meteoric_cry/p/4483174.html