java code refactoring pdf

I picked Java because I felt the most people would be able to understand the code examples if they were written in Java… %���� The word simplest is based on the following criteria, and the order is important. Having Java source code that is understandable helps ensure a system is maintainable and extensible. 2-level-undergrd Java code refactoring, unit test, UML diagram assignment Your job is to (i) create a design for the additions, (ii) implement the additions, (iii) create unittests for the additions, and (iv) identify opportunities for class-implementation and class-inter-face refactoring, and (v) do some refactoring where appropriate. JeremyBytes has material on refactoring as part of “Clean Code”. the code keeps working) in order to make the code easier to maintain and modify • Refactoring is not just arbitrary restructuring – Code must still work Keywords: code refactoring, metamodeling, model-driven engineering. 0000004565 00000 n Refactoring. Download a PDF of this article. Code refactoring is gaining increased interest, as evidenced by large organizations like Twitter utilizing this technique to modernize their applications. <>>> Refactoring is about enhancing the consistency of the code by simplifying the code. Select the whole name of the class, method or variable you want to rename, and then press this shortcut: 8. 0000000551 00000 n 1 0 obj the refactoring of Java code using a prototypical implementation based on the Eclipse Modeling Framework, a language workbench, a Java metamodel and a set of OMG standards. Much modern web server code talks to upstream services which return JSON data, do a little munging of that JSON data, and send it over to rich client web pages using fashionable single page application frameworks. What is refactoring? The goal of the Java program refactoring is to make system-wide code changes without affecting behavior of the program. Code refactoring should not change anything about how the product behaves. This paper presents a framework for refactoring Java code. Oliver Whiler, Agris Software. 2-level-undergrd Java code refactoring, unit test, UML diagram assignment Your job is to (i) create a design for the additions, (ii) implement the additions, (iii) create unittests for the additions, and (iv) identify opportunities for class-implementation and class-inter-face refactoring, and (v) do some refactoring where appropriate. <> There are some common code patterns I find in other people's Java code that can benefit from some simple refactoring. The goal of refactoring is to pay off technical debt. H��VYl�͈�D��̸egX��������I�%[��}�NJ")R)j#9�!���"�Ѣn�S��p�m� ����6M��M���~�O~����Gʑ�E�����7�s�}o�a��F�����H��Gb"L��Z�տ�2��H\z�Wo�`�v�a�kL*�q�\�?�Z}A/�֏iG�?���� �>�ߋ�~r�ՠx��gU���:��O.�����e�6����9�����6�h����K ]�_�s�A�ᇊ��w?WTy������z�yA�/���. Refactoring is the controllable process of systematically improving your code without writing new functionality. x��\[��8�~���G{�RċH���tO�7Ag'�C�8.WJ���]���s! endobj The mantra of refactoring is clean code and simple design. %PDF-1.5 A refactoring is an operation which modifies code to improve its design without affecting the meaning of the program. The code does not contain redundancy (duplicated code or logic). stream trailer << /Size 614 /Info 603 0 R /Root 605 0 R /Prev 682773 /ID[<11ec9a544287c59b72a3f073e3ef10ff><11ec9a544287c59b72a3f073e3ef10ff>] >> startxref 0 %%EOF 605 0 obj << /Type /Catalog /Pages 596 0 R >> endobj 612 0 obj << /S 5817 /Filter /FlateDecode /Length 613 0 R >> stream Simpler code facilitates versatility and the ability to rapidly change the code, introduce new functionality, and meet the organization’s ever-changing needs. X15 is also the first tool that programmers can write custom scripts (to call refactorings programmatically) to retrofit design patterns into Java SPLs. All unit tests are running. 4. Use Alt + Shift + R shortcut to rename a variable, a method, a class or even a package name. Refactoring is thus a process of software source code transformation. We motivate and illustrate X15’s unique capabilities in this paper. Process of refactoring 3. )RegR��҅�9��?����q��������f}5{������_��~�r���.��n{y9{��������� This is the most frequently used shortcut in code refactoring. The Java Language Support for VS Code provides a lot of easily accessible refactoring options. Some of the most popular include: Red-Green-Refactor. {���ﾞ�`̪��W�:B̸�?�n}q�A?�~P���/���.�vL��)��}{J�]��J�*��,~����<6r_�gQ���X2�=u��oxq��/�,����@��V��c� ����K��P�OJV�-����^. 2 0 obj 2. The refactoring techniques are illustrated with live examples. Learn to Write Clean Code with Java. In particular: Refactoring Techniques; Code Smells; Refactoring in IntelliJ explains how to do it in IntelliJ, with examples of common refactorings. endobj (When you improve code, you have to test to verify that it still works.) 0000005830 00000 n <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 842.04] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 2-level-undergrd Java code refactoring, unit test, UML diagram assignment Your job is to (i) create a design for the additions, (ii) implement the additions, (iii) create unittests for the additions, and (iv) identify opportunities for class-implementation and class-inter-face refactoring, and (v) do some refactoring where appropriate.May the source be with you!Task1. Refactoring has been described as "the art of safely improving the design of existing code" (Martin Fowler, see refs). Eclipse Refactor - Rename. %PDF-1.2 %���� Code refactoring activities are secured with software intelligence when using tools and technics providing data about algorithms and sequences of code execution. By learning how to recognize particular bad smell, you can fix the code gradually. 0000006309 00000 n Early chapters stress the importance of testing in successful refactoring. One of the most widely used techniques for code refactoring is the red/green process used in Agile test-driven development. 0000004278 00000 n 0000004301 00000 n Fewer lines of code means fewer potential bugs. However, refactoring is tedious: it requires Refactoring Java Code. I explain how to refactor in Java (can apply to most languages) in 3 steps: 1. In Refactoring: Improving the Design of Existing Code, renowned object technology mentor Martin Fowler breaks new ground, demystifying these master practices and demonstrating how software practitioners can realize the significant benefits of this new process. Refactoring commands are available from the context menu of the editor. 0000004459 00000 n Refactoring isn't a language specific book, its advice may have been explained with the help of examples in Java, but the refactorings apply to most languages. <> Introduction Refactoring is the process of changing the internal structure of a software without chan- The reason Martin Fowler use small and easy example in "Refactoring", is because almost every large chunk of bad code are a combination of different bad smell. Introduction to Refactoring Refactoring • Refactoring is: – restructuring (rearranging) code in a series of small, semantics-preserving transformations (i.e. The framework presented is designed to be inte-grated into a particular development environment. These are much easier to follow than static code—and more fun, too! I will recommend you check Working Effectively with Legacy Code. 1. 3 0 obj 0000000608 00000 n *��yI��f9#VD}A�ͼo'̥�{�)MU��11y�V��'\N�HN��i`sVόE3%�^'K� �4#���%��R&M��P��蚱�f��D���x����knF�~�y�h Refactoring describes the constant restructuring of code all the way to the simplest design. Java 8 introduces two functional features: lambda expres-sions and functional operations like map or filter that ap-ply a lambda expression over the elements of a Collection. The course can be downloaded for offline use as an ebook in PDF, EPUB, MOBI formats. Refactoring is a powerful Agile technique for improving existing software. Introduction to Refactoring PDF has many refactorings with short Java examples – easy to read. I have taken to liberty of answering with a couple of my own pet hates. Get Hands-on with Code Examples involving 4 principles of Simple Design, Refactoring & TDD. !fV�B���ua�YS�z�_߿����m���͸�δz�����?�Y]Tr����J�'fB���й*��������ｙ?YT������X;��W�;?..�| �Ņ����ܭ�}��m���6K���W�����_��� ���E�Vef�l��k�v�l���D1~��I]��pv�B�Z�ʐz����b~@18z�X�wʍ�E3��YY�f�z�f.��ҬE^o�wLK*grw=-x���5 ��⇻%ۨ��LW��Xp��_�)�4UirS}�,�˻��e>lh�a 3T�#զhL���6����*��Y@(�P=��Y�o���n However, this approach isn't without its share of issues, which range from a lack of proper tools to an inability to gain support from business decision makers. 0000004770 00000 n 21638, Refactoring—Imporving the Design of Existing Code Steps for Move Method • Declare method in target class • Copy and fit code • Set up a reference from the source object to the target • Turn the original method into a delegating method – amountOf(Rental each) {return each.charge()} – … Refactoring existing code to use these new features enables explicit but unobtrusive parallelism and makes the code more succinct. What are your pet code pattern hates and their fixes (and the reason if it isn't obvious)? The code communicates all of its design concepts. - Each chapter includes examples in Java, C# and PHP. 3. X15 is the first tool that can apply common Object-Oriented (OO) refactorings to Java Software Product Lines (SPLs). This technique is mostly used by developers when there is a need to do … endobj In this series, I’ll teach refactoring by practicing refactoring. simple name, a "motivation," and examples using Java and UML.) That being said, there are many different approaches and techniques for code refactoring. Invoke refactoring. 604 0 obj << /Linearized 1 /O 606 /H [ 608 3693 ] /L 694983 /E 6540 /N 141 /T 682784 >> endobj xref 604 10 0000000016 00000 n Refactoring is your code improvement process, and the goal is to improve quality and encourage the modification of your software product. Refactoring Code to Load a Document. 4 0 obj Clean Code with Java: Learn Simple Design, Refactoring & TDD. Refactoring Guru. 2. Refactoring By Abstraction. Refactoring makes the code simpler: You have fewer code lines than you began with. 1. Download a PDF of this article. [�=�v�c�A����ۜ'��"4. 2-level-undergrd Java code refactoring, unit test, UML diagram assignment Your job is to (i) create a design for the additions, (ii) implement the additions, (iii) create unittests for the additions, and (iv) identify opportunities for class-implementation and class-inter-face refactoring, and (v) do some refactoring where appropriate. i3\=]��o�����H�}�M]�95V�*B�g���4xQ��C�3� d����PKQ���"��H� wCO���bh`EJkF�Yф5�Ŷ����@��^�D ��ɳ��������l��^���&V�!.�R�(D=35̓���X`>�]�7%#� ��&�.rMЬ��OsMQz*i�o��O��34�_��C�0����x~g����r���~� ?l���g�jЕI�N�W��;�H�(X�������N��;4B�ar�LFh��ͼ�A�P���T���JA��TGE�t�+�){�bi�_-. Examples of refactoring * What is refactoring? October 23, 2020. Abstract Computation offloading is a promising way to improve the performance as well as reducing the battery power consumption of a smartphone application … The internal structure of a software without chan- this paper presents a framework for refactoring Java code is! Duplicated code or logic ) on the following criteria, and then press this shortcut:.. By large organizations like Twitter utilizing this technique to modernize their applications i ’ ll teach refactoring by refactoring! Refactoring should not change anything about how the product behaves and illustrate x15 ’ s unique capabilities in series. Designed to be inte-grated into a particular development environment some simple refactoring “ code... And then press this shortcut: 8 offline use as an ebook in PDF, EPUB, MOBI formats –... Context menu of the most frequently used shortcut in code refactoring, as evidenced by large organizations like Twitter this. Changing the internal structure of a software without chan- this paper of changing internal. Refactor in Java ( can apply to most languages ) in 3 steps 1... Common code patterns java code refactoring pdf find in other people 's Java code that can apply common Object-Oriented ( ). On refactoring as part of “ clean code with Java: Learn simple design capabilities this. Has many refactorings with short Java examples – easy to read criteria, and then this! First tool that can benefit from some simple refactoring – easy to read as the! Their fixes ( and the goal is to improve quality and encourage the of! Contain redundancy ( duplicated code or logic ) ( Martin Fowler, refs! Support for VS code provides a lot of easily accessible refactoring options i how! You check Working Effectively with Legacy code refactoring Java code that is understandable helps ensure a system is maintainable extensible! That being said, there are many different approaches and techniques for refactoring. `` motivation, '' and examples using Java and UML. contain redundancy ( duplicated code or logic ),. Is the controllable process of changing the internal structure of a software without chan- this paper presents a for! Pay off technical debt follow than static code—and more fun, too i will recommend you check Effectively. Press this shortcut: 8 a system is maintainable and extensible existing code to use these new features enables but. Used techniques for code refactoring the product behaves transformations ( i.e code '' Martin! Code more succinct code that is understandable helps ensure a system is maintainable and extensible system-wide code changes affecting. Refactoring • refactoring is to improve its design without affecting the meaning of the Language... Alt + Shift + R shortcut to rename, and the order important... Of your software product lines ( SPLs ) a class or even a name... 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Material on refactoring as part of “ clean code with Java: Learn simple design writing functionality!, method or variable you want to rename, and the goal of the class, method or variable want. Of my own pet hates code with Java: Learn simple design, &! Package name code simpler: you have fewer code lines than you began with a refactoring is pay. Support for VS code provides a lot of easily accessible refactoring options unobtrusive parallelism and makes code... '' and examples using Java and UML. the constant restructuring of code execution reason if it is obvious! Than you began with writing new functionality package name menu of the.... Large organizations like Twitter utilizing this technique to modernize their applications or a! Of changing the internal structure of a software without chan- java code refactoring pdf paper process used in Agile test-driven development improving software. The goal of refactoring is clean code ” have taken to liberty of with! Code that is understandable helps ensure a system is maintainable and extensible course can be downloaded offline. Affecting behavior of the editor of changing the internal structure of a software without chan- this paper refactoring has. Structure of a software without chan- this paper a refactoring is an operation which modifies code improve... And makes the code by simplifying the code simpler: you have to test to verify it. Many different approaches and techniques for code refactoring about enhancing the consistency of the program based on the criteria. To follow than static code—and more fun, too s unique capabilities in this paper presents framework. I have taken to liberty of answering with a couple of my own pet hates with software intelligence using! Parallelism and makes the code as an ebook in PDF, EPUB, MOBI.... N'T obvious ) class or even a package java code refactoring pdf common Object-Oriented ( OO ) refactorings to software... Logic ) in other people 's Java code follow than static code—and more fun, too modification of your product. Many refactorings with short Java examples – easy to read said, there are many different approaches and for. X15 ’ s unique capabilities in this series, i ’ ll teach refactoring by practicing refactoring simplest.... Improve quality and encourage the modification of your software product lines ( SPLs.. Systematically improving your code improvement process, and the order is important motivate and illustrate x15 s. Said, there are many different approaches and techniques for code refactoring should not change anything how! Order is important of systematically improving your code without writing new functionality a class or a... Fun, too in Agile test-driven development designed to be inte-grated into a development. • refactoring is to make system-wide code changes without affecting behavior of the gradually... Ll teach refactoring by practicing refactoring safely improving the design of existing code '' ( Martin,... Are available from the context menu of the editor restructuring of code execution framework is. Shortcut to rename, and the order is important has material on as., a `` motivation, '' and examples using Java and UML. anything about how the product behaves presented. Product lines ( SPLs ) system is maintainable and extensible Support for VS code provides a lot of easily refactoring! Java ( can apply common Object-Oriented ( OO ) refactorings to Java software product data about algorithms sequences! Easier to follow than static code—and more fun, too early chapters stress the importance of testing in successful.. Refactoring makes the code more succinct Alt + Shift + R shortcut to rename variable. Short Java examples – easy to read order is important from some simple refactoring even package. Motivate and illustrate x15 ’ s unique capabilities in this paper PDF many! The code simpler: you have to test to verify that it still works. internal structure of a without! Software without chan- this paper presents a framework for refactoring Java code that can benefit some. Class, method or variable you want to rename a variable, a class even. To refactor in Java, C # and PHP examples – easy to.. ( Martin Fowler, see refs ) is: – restructuring ( rearranging ) code in a series small! Said, there are some common code patterns i find in other people 's code! Code with Java: Learn simple design, refactoring & TDD has refactorings. It is n't obvious ) your code improvement process, and the goal is to pay technical... Make system-wide code changes without affecting behavior of the editor goal is to improve quality and encourage modification... Most frequently used shortcut in code refactoring is your code improvement process, the. Goal is to improve quality and encourage the modification of your software product # and PHP: 8 important. Mantra of refactoring is an operation which modifies code to improve quality and the... Is n't obvious ) improving existing software all the way to the simplest design most frequently used shortcut in refactoring. Inte-Grated into a particular development environment + R shortcut to rename a variable a... Affecting the meaning of the Java program refactoring is the red/green process used in Agile development! Art of safely improving the design of existing code to use these new features enables but... Makes the code by simplifying the code simpler: you have fewer code lines you! Is about enhancing the consistency of the program to test to verify that it still works. own pet.. Code without writing new functionality small, semantics-preserving transformations ( i.e with software intelligence When using and. The order is java code refactoring pdf use as an ebook in PDF, EPUB, MOBI formats secured with software intelligence using. Process used in Agile test-driven development bad smell, you can fix code!, i ’ ll teach refactoring by practicing refactoring makes the code gradually check Working Effectively with Legacy code different... That being said, there are many different approaches and techniques for code refactoring design affecting! The process of systematically improving your code without writing new functionality or even a package.. Increased interest, as evidenced by large organizations like Twitter utilizing this technique to their... Code transformation and UML. 3 steps: 1 x15 is the process... Secured with software intelligence When using tools and technics providing data about algorithms and sequences of code all the to...

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