You want to call a method, but you forget what its parameters are, and you would like some hints.
Place the cursor in the method's argument list and press Ctrl-Shift-Space, or select Edit Parameter Hints.
When you place the cursor in a method's argument list, you will see a list of parameter hints. In the JDT editor, press Ctrl-Shift-Space, or select Edit Parameter Hints. A tool tip will appear, showing the method's parameters.