How Java is handling our new customer creation,

In Following, can you tell me where I can see what the values are on the
statements
dionam = ?

Basically, we want to see how the Java code, handles a new customer.
We know that it does handle it, but not sure HOW it is doing this.

// CDM FILES FOR CUSTOMER CREATION

// DIONAM - interface file for SRONAM, new customers, basic data
dionam = (IAS400File) ASW.openAS400File("DIONAM", "", 2, false);
// DIONAD - interface file for SRONAD, new customers, Addresses
dionad = (IAS400File) ASW.openAS400File("DIONAD", "", 2, false);
// DIONOI - interface file for SRONOI, new customers, customer data
dionoi = (IAS400File) ASW.openAS400File("DIONOI", "", 3, false);
// DIOCMA - interface file for SROCMA, new customers, A/R data
diocma = (IAS400File) ASW.openAS400File("DIOCMA", "", 3, false);
// DIONFP - interface file for SRONFP, new customers, contact data
dionfp = (IAS400File) ASW.openAS400File("DIONFP", "", 3, false);

srbtpi = (IAS400File) ASW.openAS400File("SROTPI", "", 3, false);
srbtpd = (IAS400File) ASW.openAS400File("SROTPD", "", 3, false);
// FOR TESTING
ISystem.println("After CDM Files for Customer creation", 1);