Add usage of incrementing id rather than random one for better readability

src/final_assignment/task_2/CaseCreator.java

@@ -40,6 +40,7 @@ public class CaseCreator {
         pairs.add(new TestPair("login-admin tester;123123123", "OK"));
 
         Vector<String> ids = new Vector<>();
+        int idCounter = 0;
 
         Vector<String> countries = new Vector<>();
 
@@ -55,10 +56,7 @@ public class CaseCreator {
             } while (countries.contains(country));
             countries.add(country);
 
-            String id;
-            do {
-                id = randomString("123456789", 3);
-            } while (ids.contains(id));
+            String id = String.format("%03d", ++idCounter);
             ids.add(id);
 
             pairs.add(new TestPair("add-ioc-code " + id + ";" + countries.elementAt(2 * i + 1) + ";"
@@ -90,10 +88,7 @@ public class CaseCreator {
         for (int s = 0; s < nSports; s++) {
             athletes.add(new Vector<>());
             for (int a = 0; a < nAthletes; a++) {
-                String id;
-                do {
-                    id = randomString("0123456789", 4);
-                } while (ids.contains(id) || id.equals("0000"));
+                String id = String.format("%03d", ++idCounter);
                 ids.add(id);
                 String country = countries.elementAt(2 * random.nextInt(nCountries));
                 athletes.elementAt(s).add(id);