You can use intelligent code completion for Java classes in the Source Editor. Type a variable name followed by a dot or a partial package name, for example:
Color color = Color.red;
int redValue = color.<insertion point here>
Then press Ctrl-Space to get a list of methods to choose from.

You can also make code completion available for your own classes. In the Explorer, right-click the node of the filesystem containing the classes you want to use and choose Tools > Update Parser Database.