MyEclipse、Eclipse自动提示不起作用

1、菜单window->Preferences->Java->Editor->Content Assist->Enable auto activation 选项要打上勾 
2、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。