1、菜单window->Preferences->Java->Editor->Content Assist->Enable auto activation 选项要打上勾
2、windows-->preference-->workbench-->keys 下设置Content Assist 的快捷键
3、window->Preferences->Java->Editor->Content Assist->Advanced 上面的选项卡Select the proposal kinds contained in the \'default\' content assist list: 中把 Other Java Proposals 选项打上勾就可以了
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作者：javaRoger
来源：CSDN
原文：https://blog.csdn.net/rogerjava/article/details/5689785
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