review changes

core-java-collections/src/main/java/com/baeldung/sort/SortHashMap.java

@@ -21,12 +21,15 @@ public class SortHashMap {
         arrayListSortByValue();
         arrayListSortByKey();
 
-        treeSetByKey();
-        treeSetByValue();
-
         sortStream();
 
         sortGuava();
+
+        addDuplicates();
+
+        treeSetByKey();
+        treeSetByValue();
+
     }
 
     private static void sortGuava() {
@@ -63,10 +66,7 @@ public class SortHashMap {
         TreeMap<String, Employee> sorted = new TreeMap<>(map);
         sorted.putAll(map);
 
-        for (Map.Entry<String, Employee> entry : sorted.entrySet()) {
-            System.out.println("Key = " + entry.getKey() +
-                    ", Value = " + entry.getValue());
-        }
+        sorted.entrySet().forEach(System.out::println);
 
     }
 
@@ -94,4 +94,11 @@ public class SortHashMap {
         Employee employee4 = new Employee(2L, "George");
         map.put(employee4.getName(), employee4);
     }
+
+    private static void addDuplicates() {
+        Employee employee5 = new Employee(1L, "Mher");
+        map.put(employee5.getName(), employee5);
+        Employee employee6 = new Employee(22L, "Annie");
+        map.put(employee6.getName(), employee6);
+    }
 }