From Content assist for static imports
To get content assist proposals for static members configure your list of favorite static members on the Opens the Favorites preference page
Java > Editor > Content Assist > Favorites
preference page.
For example, if you have addedjava.util.Arrays.*
ororg.junit.Assert.*
to this list, then all static methods of this type matching the completion prefix will be added to the proposals list.
Open Window » Preferences » Java » Editor » Content Assist » Favorites