add one map to another

core-java-collections/src/main/java/com/baeldung/map/java_8/MergeMaps.java

@@ -28,6 +28,24 @@ public class MergeMaps {
         streamOf();
 
         streamEx();
+
+        streamMerge();
+    }
+
+    private static void streamMerge() {
+
+        Map<String, Employee> map3 = map2.entrySet()
+                .stream()
+                .collect(
+                        Collectors.toMap(
+                                Map.Entry::getKey,
+                                Map.Entry::getValue,
+                                (v1, v2) -> new Employee(v1.getId(), v2.getName()),
+                                () -> new HashMap<>(map1)
+                        )
+                );
+
+        System.out.println(map3);
     }
 
     private static void streamEx() {
@@ -75,7 +93,6 @@ public class MergeMaps {
     }
 
 
-
     private static void initialize() {
         Employee employee1 = new Employee(1L, "Henry");
         map1.put(employee1.getName(), employee1);