In a Visual Studio, you would use Ctrl+L, whereas in Eclipse I am forced to select a line or, if it is empty, go the beginning of the line before clicking
In the future, if you need to quickly find a keyboard shortcut for something simple, just hit Ctrl+Shift+L.
To quickly find shortcuts, hit Ctrl + L, Ctrl + L (Ctrl+L twice), then type something approximating what your command does in the filter text for the key assignments. This works pretty well for most shortcuts, although it can be a bit tricky for some where the name of their menu assignment bears no relation to that of their command in this list (for instance, Team->Revert to base appears in the keys list as 'Replace with latest from repository'), so sometimes a little lateral thought is required :-) If no shortcut exists, it's easy to add one in the keys dialog.
You can reassign the Delete Line
command to your favourite hotkey.
Window->Preferences
General->Editors->Keys.
Now type "Delete" and reassign the filtered commando.
Ctrl + D should delete the line.
if your are using MAC then it is
command + D => ⌘ + D
Ctrl + D
From Help->Key Assist... there are all kinds of useful keyboard shortcuts for Eclipse.
For Mac users: ⌘ + D