Your Instructor

Dr Heinz M. Kabutz
Dr Heinz M. Kabutz

Heinz Kabutz The author of The Java Specialists’ Newsletter, a publication enjoyed by tens of thousands of Java More than 145 countries have experts in this field. His book “Dynamic Proxies (in German)” was #1 Bestseller on Amazon.de in Fachbücher für Informatik for about five minutes until Amazon fixed their algorithm. Thank you to He has sold five copies of the book thanks to his supportive mother.

Heinz’s Java Specialists’ newsletter is filled with amusing anecdotes of life on the Island of Crete. He is a frequent speaker at the best Java Conferences around the globe and He also teaches at the worst. He teaches Java He teaches courses in classrooms around world where his main objective is to Make sure none of his students go to sleep. He isn’t always successful.

Course Curriculum

1. Welcome to The Age of Monolithic Legacy

1.1 Welcome (1.12)

1.1.1 Slides

1.1.2 Exercises

1.2 Refactoring (3:48)

1.3 Setting up your IDE (6:14).

1.4 Building the OFBiz Project (6.32)

1.5 Analyzing Code for Refactoring IDEA (12.01)

2. Cleaning up Some Pre-Java 5 Dinosaur Code

2.1 Refactoring to Java 5 (2:04)

2.2 Get Rid Of UnnecessaryBoxing:Unboxing (9.37).

2.3 Changing StringBuffer to StringBuilder (1:30).

2.4 String.contains() IndexOf is better than indexOf() (4:19)

2.5 Replace “for” Loop With Java 5-In (9:47).

2.6 Replace “while” Loop With Java 5-In (10:22).

3. Moving to Java 7. Our Code is entering the Age of Mammals

3.1 Java 5 Refactorings8:18)

3.2 Java 7 Refactorings, Diamond Operator (5.18)

3.3 Java 7 Collapsing Try-Catch Blocks (2.38)

3.4 Java 7 Refactoring to Try-With-Resource (13:11).

4. Fire is Discovered in Lambdas and Method References Java 8

4.1 Java 8 Interfaces: Static Methods (1.27)

4.2 Java 8 Default Methods for Interfaces (2:04).

4.3 How Functional Interfaces Work (1.58)

4.4 The Four Types of Method Refers (10:45).

4.5 Refactoring to Iterable.forEach() (4:41)

4.6 Refactoring to Use Collection.removeIf() (9:10)

5. Java 8 StreamsWe are moving towards the Stone Age

5.1 Introduction to Java 8 Streams (4:43)

5.2 Stream map()Filter()Collect() (4:15)

5.3 Refactoring to Lambdas and Method References (9.54)

5.4 Comparators Java 8 (23:51)

5.5 Arrays.setAll() (1:59)

5.6 Single Map Methods getOrDefault()Fusion(), putIfAbsent() (7:47)

6. Refactoring Our Code to Use map()/collect() The Bronze Age

6.1 Refactoring ContainerConfig.getContainerPropsFromXML() (3:24)

6.2 collect() UtilCache.values() (1:58)

6.3 map():collect() in UtilDateTime.getTimeZones() (4:03)

6.4 Map():collect() in EntityJoinOperator.freeze() (1:35)

6.5 Collection.forEach() in EntityJoinOperator.visit() (0:21)

6.6 map():filter():collect() in EntitytFinderUtil.createCondition() (1:40)

6.7 Map():filter():collect() in EntityDataLoader.getUrlByComponentList() (0:39)

6.8 Map():collect() DelegatorContainer() (1:09)

6.9 Map():sum() in OagisShipmentServices.oagisReceiveShowShipment() (4:20)

6.10 Arrays.setAll() in ShoppingListEvents.markCartItemsArray() (3:21)

7. Matching and Find in StreamsOur Code is Close to the Iron Age

7.1 Stream all.any:noneMatch() (2:06)

7.2 AnyMatch() in MapContext.containsKey() (0:25)

7.3 AllMatch() FileUtil (1.43)

7.4 AllMatch() in EntityJoinOperator.isEmpty() (0:24)

7.5 anyMatch() in ModelEntity.getHasFieldWithAuditLog() (0:43)

7.6 allMatch() in ModelEntity.areFields() (0:16)

7.7 Collect() in ModelEntity.getFieldNamesFromFieldVector() (0:33)

7.8 AnyMatch() in ProductPromoWOrker.hasOrderTotalCondition() (2:16)

7.9 Stream.findFirst:Any (1:57)

7.10 findFirst() MapContext.get() (4:34)

7.11 Creating Stream with Spliterator in findFirst() in UtilObject.getObjectFromFactory() (3:38)

7.12 findFirst() ModelRelation (0.58)

7.13 FindFirst() ShoppingCartItem (1.11)

7.14 FindFirst() in LoadSale.selectedSale() (4:47)

7.15 Optional in OrderReadHelper.getShippableSizes() (5:00)

8. We enter the Information Age, but not a monolithic one.

8.1 distinct() in PaymentGatewayServices.capturePaymentsByInvoice() (3:23)

8.2 filter():collect() in ContainerConfig.getPropertiesWithValue() (2:27)

8Map.3():sum() in UtilCache.getSizeInBytes() (4:23)

8.4 deep Refactoring in UtilMisc.LocaleHolder.getAvailableLocaleList() (12:22)

8.5 filter():map():collect() in ModelGroupReader.getEntityNamesByGroup() (1:01)

8.6 map():reduce() in InvoiceServices.updatePaymentApplicationDefBd() (3:41)

8.7 Collectors.groupingBy() in ModelReader.rebuildResourceHandlerEntities() (4:58)

8.8 groupingBy():Checked Exception with ModelReader.getEntitiesByPackage() (13:42)

8.9 Creating Own Spliterator for NodeELResolver.getValue() (6:27)

8.10 Conclusion (1.11)

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Here’s what you’ll get in Dr Heinz M. Kabutz – Refactoring to Java 8 Streams and Lambdas Online Self- Study Workshop