Within an editor, content assist helps reduce the characters typed by providing a context sensitive list of possible completions to the characters already typed. The context assist can be invoked by clicking Ctrl + Space.
If you are editing the body of a method in the java editor and press Ctrl + Space on a new line it will bring up a dialog showing −
To select an item from the list just highlight the item using the up or down arrow keys and press enter.
If you type some characters and then press Ctrl + space the dialog box will show only items that start with the characters typed in.