Configure Eclipse to show Content help (intellisense) in Java
If you are running Eclipse for first time for Java, you may not get content assitant help while pressing Ctrl+Space saying “No Default Proposals”. To get Content Assist Help (like Intellisense in Microsoft Visual Studio), you have to configure it at first.
In Eclipse IDE, go to Windows -> Preferences. A new window opens.
In left pane, click Java -> Editor -> Content Assit -> Advanced.
Now, in right pane top box, you can select Proposals to be shown in Default Proposal of Content Assist.
Finally, Click Ok to save the configuration and you are done.

Thank you! you save much time searching that option