Updating to work with java 1.6

Author: sk02241994

src/main/java/org/json/JSONObject.java

@@ -3500,7 +3500,11 @@ else if (!rawType.isPrimitive() && !rawType.isEnum() && value instanceof JSONObj
      */
     private Map<?, ?> convertToMap(JSONObject jsonMap, Type keyType, Type valueType, Class<?> mapType) throws JSONException {
         try {
-            InstanceCreator<?> creator = collectionMapping.getOrDefault(mapType, () -> new HashMap<>());
+            InstanceCreator<?> creator = collectionMapping.getOrDefault(mapType, new InstanceCreator<List>() {
+                    public List create() {
+                        return new HashMap();
+                    }
+                });
             @SuppressWarnings("unchecked")
             Map<Object, Object> createdMap = (Map<Object, Object>) creator.create();