This sample demonstrates how to export adjacent collections. Source code is as following
Department depIT = new Department("IT");
Employee elsa = new Employee("Elsa", 28, 1500, 0.15);
depIT.addEmployee(elsa);
Employee oleg = new Employee("Oleg", 32, 2300, 0.25);
depIT.addEmployee(oleg);
Employee neil = new Employee("Neil", 34, 2500, 0.00);
depIT.addEmployee(neil);
Employee maria = new Employee("Maria", 34, 1700, 0.15);
depIT.addEmployee(maria);
Employee john = new Employee("John", 35, 2800, 0.20);
depIT.addEmployee(john);
Department depHR = new Department("IT");
Employee natali = new Employee("Natali", 25, 1200, 0.1);
depHR.addEmployee( natali );
Employee helen = new Employee("Helen", 27, 1100, 0.20);
depHR.addEmployee(helen);
Employee olga = new Employee("Olga", 24, 1150, 0.00);
depHR.addEmployee(olga);
Map beans = new HashMap();
beans.put("depIT", depIT);
beans.put("depHR", depHR);
XLSTransformer transformer = new XLSTransformer();
transformer.transformXLS(templateFileName, beans, destFileName);
Template file screenshot

You can also download Excel version adjacentlists.xls
Output file looks like

Excel file adjacentlist_output.xls