Hexagonal pattern: Simplified lottery ticket ids

hexagonal/src/main/java/com/iluwatar/hexagonal/domain/LotteryTicketId.java

@@ -22,29 +22,49 @@
  */
 package com.iluwatar.hexagonal.domain;
 
-import java.util.UUID;
-
 /**
  * Lottery ticked id
  */
 public class LotteryTicketId {
-  
-  private final UUID id;
+
+  private static volatile int numAllocated;
+  private final int id;
   
   public LotteryTicketId() {
-    id = UUID.randomUUID();
+    this.id = numAllocated + 1;
+    numAllocated++;
   }
 
-  public LotteryTicketId(String str) {
-    id = UUID.fromString(str);
+  public LotteryTicketId(int id) {
+    this.id = id;
   }
   
-  public UUID getId() {
+  public int getId() {
     return id;
   }
 
   @Override
   public String toString() {
-    return id.toString();
+    return String.format("%d", id);
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+
+    LotteryTicketId that = (LotteryTicketId) o;
+
+    return id == that.id;
+
+  }
+
+  @Override
+  public int hashCode() {
+    return id;
   }
 }

hexagonal/src/main/java/com/iluwatar/hexagonal/service/ConsoleLottery.java

@@ -32,7 +32,6 @@ import com.iluwatar.hexagonal.domain.LotteryTicketCheckResult;
 import com.iluwatar.hexagonal.domain.LotteryTicketId;
 import com.iluwatar.hexagonal.domain.PlayerDetails;
 import com.iluwatar.hexagonal.module.LotteryModule;
-import com.iluwatar.hexagonal.sampledata.SampleData;
 
 import java.util.HashSet;
 import java.util.Optional;
@@ -52,7 +51,6 @@ public class ConsoleLottery {
     Injector injector = Guice.createInjector(new LotteryModule());
     LotteryService service = injector.getInstance(LotteryService.class);
     WireTransfers bank = injector.getInstance(WireTransfers.class);
-    SampleData.submitTickets(service, 20);
     Scanner scanner = new Scanner(System.in);
     boolean exit = false;
     while (!exit) {
@@ -103,7 +101,7 @@ public class ConsoleLottery {
           winningNumbers.add(Integer.parseInt(parts[i]));
         }
         LotteryTicketCheckResult result = service.checkTicketForPrize(
-            new LotteryTicketId(id), LotteryNumbers.create(winningNumbers));
+            new LotteryTicketId(Integer.parseInt(id)), LotteryNumbers.create(winningNumbers));
         if (result.getResult().equals(LotteryTicketCheckResult.CheckResult.WIN_PRIZE)) {
           System.out.println("Congratulations! The lottery ticket has won!");
         } else if (result.getResult().equals(LotteryTicketCheckResult.CheckResult.NO_PRIZE)) {