To save and extract the method that is currently selected in the Methods List
Select the Extract command from the Methods menu.
The common Save As dialog is then displayed, to enable you to specify the name and location of your method file.
The file name defaults to the name of the current type and method, with an .mth suffix (for example, when extracting the getAddress method from the Customer class, the default file name is Customer_getAddress.mth). The location defaults to your JADE working directory.