在Window->preferences->Java->Editor->Content Assist
修改右下角Auto activation triggers for Java里面，将里面的‘.’改为
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789
转自：http://wangwengcn.iteye.com/blog/1599438
原文：http://www.cnblogs.com/express/p/5072910.html