Eclipse setting prompt information

Input
String Ss = "hello ";
SS.

No prompt, press Alt +/, Status Bar Display : No completions available!

Answer:
The default value is Alt + /;
You can also Set Favorite shortcut keys
Windows --> preference --> workbench --> keys --> has a command
Select edit in the first list box.
Select Content assist in the second list box.
This is the code prompt function,
You can set your favorite shortcut keys, such as Ctrl + J;

 

NOTE: If no prompt is displayed, check all the options in