1. The secondary method is used without a hint: Open the Windows--preferences--java--editor--content assist above eclipse in turn, and in the upper right there is a line "select the proposal Kinds contained in the ' Default ' content assist list, tick the Java prolosals check box to save the exit.
2. Open the Windows--preferences--general--keys above eclipse in turn, there is a search box under scheme, enter "Content asist" in the search box (My eclipse in this search box can not be entered, the following button preempted the focus, so I chose to copy and paste, pay attention to the case when searching), select "Content asist" This item, the binding item is changed to "alt+/" (Press the "/" key to change), Select the When item as editing text;
If alter +/does not work may be a shortcut key is occupied, or not set this, LZ for the first time under the CentOS open eclipse encountered this problem, focus on the second
Workaround for eclipse does not automatically eject hints (Eclipse alt+/shortcut key fails) CentOS 6.7