Code to generate test cases and add a uniform distribution of parameters

import java.util.*;  
 /**  
  * Created by Mridul on 9/25/2015.  
  */  
 public class DotcomSuiteGenerator {  
   /**  
    * method which recursively generates the probable testcases  
    * @param prefix  
    * @param lists  
    */  
   private static int counter;  
   private List<String> randomList=new ArrayList<>();  
   private List<String> copyOfRandomList=new ArrayList<>();  
 /*  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, len);  
       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));  
           ++counter;  
         }  
       }  
     }  
   }*/  
   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, len);  
       for (String value : list) {  
         String name = prefix + value + spacer;  
         generate(name,spacer,lists); //recursive call  
         if(lists.length==0) {  
           name = name + getRandomListValue();  
           System.out.println(name);  
           ++counter;  
         }  
       }  
     }  
   }  
   private String getRandomListValue(){  
     String result="";  
     int size=copyOfRandomList.size();  
     if(size==0)  
       copyOfRandomList=new ArrayList<>(randomList);  
     if( size >= 0) {  
       Collections.shuffle(copyOfRandomList);  
       result = copyOfRandomList.remove(0);  
     }  
     return result;  
   }  
   public void appendRandomVariables(List<String>... lists) {  
     //creating combo list containing all the data for booking  
     List<String> comboBookingParams=new ArrayList<>();  
     for(int index=0; index < lists.length; index++) {  
       comboBookingParams.addAll(lists[index]);  
     }  
     randomList=comboBookingParams;  
     copyOfRandomList=new ArrayList<>(randomList);  
     for(String value: copyOfRandomList){  
       System.out.println("value : "+value);  
     }  
     System.out.println(" copyOfRandomList.size() : "+copyOfRandomList.size());  
   }  
   public static void main(String... args){  
     //constants  
      //String prefix="Shopping_Calendar_Matrix_Pricing_"; //for shopping  
      String prefix="Booking_";  
      String spacer="_";  
     //parameters  
      List<String> tripTypeOW=Arrays.asList("OW");  
      List<String> tripType=Arrays.asList("RT","MC");  
      List<String> route=Arrays.asList("DOM","INTL");  
      List<String> paxTypeADT= Arrays.asList("ADT");  
      List<String> paxTypeSRC= Arrays.asList("SRC");  
      List<String> payTypeD=Arrays.asList("Dollars");  
      List<String> payTypeP=Arrays.asList("Points");  
      List<String> flightType=Arrays.asList("Dir","Conn");  
      List<String> fareType=Arrays.asList("BUS","ANY","WGA");  
      List<String> fareTypeRED=Arrays.asList("BUSRED","ANYRED","WGARED");  
      List<String> scenarioType=Arrays.asList("SameMonth","DifferentMonth");  
      List<String> discountType=Arrays.asList("AmtDiscount","PercDiscount");  
     //booking specific parameters  
     List<String> creditCards=Arrays.asList("Visa","Mastercard","Diner","Discover","UATP","Amex");  
     List<String> otherPayTypes=Arrays.asList("GIF","LUV");  
     List<String> comboPayType=Arrays.asList("Visa_GIF","Visa_LUV","Mastercard_GIF","Mastercard_LUV",  
                         "Diner_GIF","Diner_LUV","Discover_GIF","Discover_LUV",  
                         "UATP_GIF","UATP_LUV","Amex_GIF","Amex_LUV");  
     List<String> cash=Arrays.asList("Cash");  
     DotcomSuiteGenerator instance=new DotcomSuiteGenerator();  
     System.out.println("The combination of tests are: ");  
     /*  
     ALL VALID COMBINATIONS OF DATA ARE GIVEN BELOW FOR SHOPPING  
      */  
     //generates all Adult Dollars for OW  
 /*    instance.generate(prefix, spacer, tripTypeOW, route, paxTypeADT, payTypeD, flightType, fareType, scenarioType);  
     //generates all Adult Points for OW  
     instance.generate(prefix, spacer, tripTypeOW, route, paxTypeADT, payTypeP, flightType, fareTypeRED, scenarioType);  
     //generates all Adult Dollars for RT and MC  
     instance.generate(prefix, spacer, tripType, route, paxTypeADT, payTypeD, flightType, flightType, fareType, scenarioType);  
     //generates all Adult Points for for RT and MC  
     instance.generate(prefix, spacer, tripType, route, paxTypeADT, payTypeP, flightType, flightType, fareTypeRED, scenarioType);  
     //generates all Senior Dollars for OW  
     instance.generate(prefix, spacer, tripTypeOW, route, paxTypeSRC, payTypeD, flightType, fareType, scenarioType);  
     //generates all Senior Points for OW  
     instance.generate(prefix, spacer, tripTypeOW, route, paxTypeSRC, payTypeP, flightType, fareTypeRED, scenarioType);  
     //generates all Senior Dollars for RT and MC  
     instance.generate(prefix, spacer, tripType, route, paxTypeSRC, payTypeD, flightType, flightType, fareType, scenarioType);  
     //generates all Senior Points for RT and MC  
     instance.generate(prefix, spacer, tripType, route, paxTypeSRC, payTypeP, flightType, flightType, fareTypeRED, scenarioType);*/  
     //ALL PERCENTAGE AND AMOUNT DISCOUNT SCENARIOS- NOT IN EXCEL SHEET- FOR FUTURE USE  
 /*    //generates all Adult Dollars with Amount and Percentage Discount  
     instance.generate(prefix, spacer, tripType, route, paxTypeADT, payTypeD, flightType, fareType, scenarioType, discountType);  
     //generates all Adult Points with Percentage Discount  
     instance.generate(prefix, spacer, tripType, route, paxTypeADT, payTypeP, flightType, fareTypeRED, scenarioType, Arrays.asList("PercDiscount"));  
     //generates all Senior Dollars with Amount and Percentage Discount  
     instance.generate(prefix, spacer, tripType, route, paxTypeSRC, payTypeD, flightType, fareType, scenarioType, discountType);  
     //generates all Senior Points with Percentage Discount  
     instance.generate(prefix, spacer, tripType, route, paxTypeSRC, payTypeP, flightType, fareTypeRED, scenarioType, Arrays.asList("PercDiscount"));*/  
     //EXPERIMENTAL- FOR FUTURE TESTCASES WITH DIFFERENT FARE TYPES ON FLIGHT SEGMENTS OF RT AND MC TESTCASES  
 /*    //generates all RT and MC trips for ADT with Dollars with separate segments  
     instance.generate(prefix, spacer, Arrays.asList("RT","MC"), route, paxTypeADT, payTypeD, flightType, fareType, fareType, scenarioType);*/  
     //generate other combo types-one time run  
     //instance.generate("", spacer, creditCards, otherPayTypes);  
     /*  
       ALL VALID COMBINATIONS OF DATA ARE GIVEN BELOW FOR BOOKING  
      */  
     //SET ALL APPENDABLE LISTS HERE  
     instance.appendRandomVariables(creditCards, otherPayTypes, comboPayType, cash);  
     //generates all Adult Dollars for OW  
     instance.generate(prefix, spacer, tripTypeOW, route, paxTypeADT, payTypeD, flightType, fareType, scenarioType);  
     //generates all Adult Points for OW  
     instance.generate(prefix, spacer, tripTypeOW, route, paxTypeADT, payTypeP, flightType, fareTypeRED, scenarioType);  
     //generates all Adult Dollars for RT and MC  
     instance.generate(prefix, spacer, tripType, route, paxTypeADT, payTypeD, flightType, flightType, fareType, scenarioType);  
     //generates all Adult Points for for RT and MC  
     instance.generate(prefix, spacer, tripType, route, paxTypeADT, payTypeP, flightType, flightType, fareTypeRED, scenarioType);  
     //generates all Senior Dollars for OW  
     instance.generate(prefix, spacer, tripTypeOW, route, paxTypeSRC, payTypeD, flightType, fareType, scenarioType);  
     //generates all Senior Points for OW  
     instance.generate(prefix, spacer, tripTypeOW, route, paxTypeSRC, payTypeP, flightType, fareTypeRED, scenarioType);  
     //generates all Senior Dollars for RT and MC  
     instance.generate(prefix, spacer, tripType, route, paxTypeSRC, payTypeD, flightType, flightType, fareType, scenarioType);  
     //generates all Senior Points for RT and MC  
     instance.generate(prefix, spacer, tripType, route, paxTypeSRC, payTypeP, flightType, flightType, fareTypeRED, scenarioType);  
     System.out.println("The total number of tests is : "+counter);