Code to generate a combination of strings recursively-Used to generate test cases from parameters

 import java.util.*;  
 /**  
  * Created by x217018 on 9/25/2015.  
  */  
 public class DotcomSuiteGenerator {  
   /**  
    * method which recursively generates the probable testcases  
    * @param prefix  
    * @param lists  
    */  
   public void generate(String prefix, String spacer, List<String>... lists) {  
     int len=lists.length;  
     if(len > 0) {  
       List<String> list = lists[0];  
       lists = Arrays.copyOfRange(lists, 1, lists.length);  
       for (String value : list) {  
         String name = prefix + value + spacer;  
         generate(name,spacer,lists); //recursive call  
         if(lists.length==0) {  
           System.out.println(name.substring(0,name.length()-1));  
         }  
       }  
     }  
   }  
   public static void main(String... args){  
     //constants  
      String prefix="Shopping_Calendar_Matrix_Pricing_";  
      String spacer="_";  
     //parameters  
      List<String> tripType=Arrays.asList("OW","RT","MC");  
      List<String> route=Arrays.asList("DOM","INTL");  
      List<String> paxTypeADT= Arrays.asList("ADT");  
      List<String> paxTypeSRC= Arrays.asList("SRC");  
      List<String> payType=Arrays.asList("Dollars","Points");  
      List<String> flightType=Arrays.asList("Dir","Conn");  
      List<String> fareTypeADT=Arrays.asList("BUS","ANY","WGA");  
      List<String> fareTypeSRC=Arrays.asList("BUSRED","ANYRED","WGARED");  
      List<String> scenarioType=Arrays.asList("SameMonth","DifferentMonth");  
      List<String> discountType=Arrays.asList("AmtDiscount","PercDiscount");  
     DotcomSuiteGenerator instance=new DotcomSuiteGenerator();  
     System.out.println("The combination of tests are: ");  
     //generates all Adult testcases  
     instance.generate(prefix, spacer, tripType, route, paxTypeADT, payType, flightType, fareTypeADT, scenarioType);  
     //generates all Senior testcases  
     instance.generate(prefix, spacer, tripType, route,paxTypeSRC,payType,flightType,fareTypeSRC,scenarioType);  
     //generates all Adult testcases with Dollars with both Amount and Percentage Discount  
     //instance.generate(prefix, spacer, tripType, route,paxTypeADT,Arrays.asList("Dollars"),flightType,fareTypeADT,scenarioType, discountType);  
     //generates all Seniors testcases with Points with both Percentage Discount  
     //instance.generate(prefix, spacer, tripType, route,paxTypeADT,Arrays.asList("Points"),flightType,fareTypeADT,scenarioType,Arrays.asList("PercDiscount"));  
   }  
 }  
 //Sample data  
 /*  
 The combination of tests are:  
 Shopping_Calendar_Matrix_Pricing_OW_DOM_ADT_Dollars_Dir_BUS_SameMonth  
 Shopping_Calendar_Matrix_Pricing_OW_DOM_ADT_Dollars_Dir_BUS_DifferentMonth  
 Shopping_Calendar_Matrix_Pricing_OW_DOM_ADT_Dollars_Dir_ANY_SameMonth  
 Shopping_Calendar_Matrix_Pricing_OW_DOM_ADT_Dollars_Dir_ANY_DifferentMonth  
 Shopping_Calendar_Matrix_Pricing_OW_DOM_ADT_Dollars_Dir_WGA_SameMonth  
 Shopping_Calendar_Matrix_Pricing_OW_DOM_ADT_Dollars_Dir_WGA_DifferentMonth  
  */