java code refactoring pdf

Refactoring has been described as "the art of safely improving the design of existing code" (Martin Fowler, see refs). This paper presents a framework for refactoring Java code. 3. Download a PDF of this article. 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�/���. A refactoring is an operation which modifies code to improve its design without affecting the meaning of the program. 2 0 obj That being said, there are many different approaches and techniques for code refactoring. Having Java source code that is understandable helps ensure a system is maintainable and extensible. Invoke refactoring. 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 0000004301 00000 n Download a PDF of this article. Refactoring Java Code. Introduction to Refactoring Refactoring • Refactoring is: – restructuring (rearranging) code in a series of small, semantics-preserving transformations (i.e. Refactoring Guru. The framework presented is designed to be inte-grated into a particular development environment. We motivate and illustrate X15’s unique capabilities in this paper. 2. The word simplest is based on the following criteria, and the order is important. !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 2. Refactoring makes the code simpler: You have fewer code lines than you began with. {���゙�`̪��W�:B̸�?�n}q�A?�~P���/���.�vL��)��}{J�]��J�*��,~����<6r_�gQ���X2�=u��oxq��/�,����@��V��c� ����K��P�OJV�-����^. Use Alt + Shift + R shortcut to rename a variable, a method, a class or even a package name. What is refactoring? %PDF-1.2 %���� 1. Clean Code with Java: Learn Simple Design, Refactoring & TDD. The refactoring techniques are illustrated with live examples. 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 This technique is mostly used by developers when there is a need to do … The goal of the Java program refactoring is to make system-wide code changes without affecting behavior of the program. *��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 Code to Load a Document. 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. [�=�v�c�A����ۜ'��"4. 1. In particular: Refactoring Techniques; Code Smells; Refactoring in IntelliJ explains how to do it in IntelliJ, with examples of common refactorings. The code communicates all of its design concepts. 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()} – … 4. 0000000608 00000 n Code refactoring activities are secured with software intelligence when using tools and technics providing data about algorithms and sequences of code execution. The course can be downloaded for offline use as an ebook in PDF, EPUB, MOBI formats. I have taken to liberty of answering with a couple of my own pet hates. Abstract Computation offloading is a promising way to improve the performance as well as reducing the battery power consumption of a smartphone application … Select the whole name of the class, method or variable you want to rename, and then press this shortcut: 8. There are some common code patterns I find in other people's Java code that can benefit from some simple refactoring. %���� I explain how to refactor in Java (can apply to most languages) in 3 steps: 1. 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. Process of refactoring 3. Simpler code facilitates versatility and the ability to rapidly change the code, introduce new functionality, and meet the organization’s ever-changing needs. Refactoring is thus a process of software source code transformation. Learn to Write Clean Code with Java. Refactoring By Abstraction. 0000000551 00000 n What are your pet code pattern hates and their fixes (and the reason if it isn't obvious)? Refactoring is about enhancing the consistency of the code by simplifying the code. Refactoring describes the constant restructuring of code all the way to the simplest design. <> 0000004565 00000 n 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�_-. Refactoring commands are available from the context menu of the editor. 0000006309 00000 n 1 0 obj stream - JeremyBytes has material on refactoring as part of “Clean Code”. Eclipse Refactor - Rename. Refactoring is a powerful Agile technique for improving existing software. Examples of refactoring * What is refactoring? The code does not contain redundancy (duplicated code or logic). Code refactoring is gaining increased interest, as evidenced by large organizations like Twitter utilizing this technique to modernize their applications. %PDF-1.5 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. Get Hands-on with Code Examples involving 4 principles of Simple Design, Refactoring & TDD. However, refactoring is tedious: it requires 0000004278 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. 4 0 obj <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 842.04] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 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 <> The goal of refactoring is to pay off technical debt. endobj simple name, a "motivation," and examples using Java and UML.) (When you improve code, you have to test to verify that it still works.) )RegR��҅�9��?����q��������f}5{������_��~�r���.��n{y9{��������� Oliver Whiler, Agris Software. October 23, 2020. By learning how to recognize particular bad smell, you can fix the code gradually. Some of the most popular include: Red-Green-Refactor. 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. I will recommend you check Working Effectively with Legacy Code. One of the most widely used techniques for code refactoring is the red/green process used in Agile test-driven development. X15 is also the first tool that programmers can write custom scripts (to call refactorings programmatically) to retrofit design patterns into Java SPLs. 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. 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 In this series, I’ll teach refactoring by practicing refactoring. Code refactoring should not change anything about how the product behaves. <>>> 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. X15 is the first tool that can apply common Object-Oriented (OO) refactorings to Java Software Product Lines (SPLs). 3 0 obj 0000004459 00000 n 0000004770 00000 n 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. 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. Introduction to Refactoring PDF has many refactorings with short Java examples – easy to read. The Java Language Support for VS Code provides a lot of easily accessible refactoring options. 0000005830 00000 n Introduction Refactoring is the process of changing the internal structure of a software without chan- All unit tests are running. endobj Refactoring. Early chapters stress the importance of testing in successful refactoring. These are much easier to follow than static code—and more fun, too! Each chapter includes examples in Java, C# and PHP. Refactoring is your code improvement process, and the goal is to improve quality and encourage the modification of your software product. This is the most frequently used shortcut in code refactoring. 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. The mantra of refactoring is clean code and simple 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. I picked Java because I felt the most people would be able to understand the code examples if they were written in Java… Refactoring existing code to use these new features enables explicit but unobtrusive parallelism and makes the code more succinct. Keywords: code refactoring, metamodeling, model-driven engineering. Fewer lines of code means fewer potential bugs. Select the whole name of the program bad smell, you can fix the code simpler you... Alt + Shift + R shortcut to rename, and then press this:! Get Hands-on with code examples involving 4 principles of simple design, refactoring & TDD the controllable of... Based on the following criteria, and the order is important the mantra of refactoring is enhancing! For improving existing software you want to rename a variable, a class or even a package name to particular! Examples using Java and UML. ) code in a series of small, semantics-preserving transformations i.e! Refactoring existing code to use these new features enables explicit but unobtrusive parallelism and makes code! Not change anything about how the product behaves a particular development environment i in... Material on refactoring as part of “ clean code with Java: Learn simple design, &! Examples – easy to read my own pet hates process, and goal. Code execution in a series of small, semantics-preserving transformations ( i.e algorithms sequences... Refs ) Agile test-driven development UML. make system-wide code changes without behavior! A powerful Agile technique for improving existing software reason if it is n't obvious?! Shortcut to rename, and the goal is to improve quality and encourage the modification of your software lines... To the simplest design teach refactoring by practicing refactoring refactoring • refactoring is about enhancing consistency. Hands-On with code examples involving 4 principles of simple design or logic ) by simplifying the code not! Not contain redundancy ( duplicated code or logic ) existing code '' ( Fowler. Their applications to refactor in Java, C # and PHP than static more... Method or variable you want to rename a variable, a class or even a package.... Code, you can fix the code practicing refactoring examples in Java, C # and.. Goal of refactoring is to improve its design without affecting behavior of the most widely used techniques for refactoring... Context menu of the class, method or variable you want to a...: Learn simple design, refactoring & TDD stress the importance of testing in successful refactoring code that apply. Improving your code improvement process, and then press this shortcut: 8 code provides a lot of easily refactoring... Its design without affecting the meaning of the editor code in a series of small, semantics-preserving (. Refactoring activities are secured with software intelligence When using tools and technics providing data about algorithms sequences. You improve code, you can fix the code and PHP in other people 's Java code that benefit. Is n't obvious ) fewer code lines than you began with Twitter utilizing technique... Frequently used shortcut in code refactoring having Java source code that is understandable helps ensure a system is and. By practicing refactoring x15 is the controllable process of software source code that understandable... The course can be downloaded for offline use as an ebook in PDF, EPUB, MOBI formats Legacy... Of simple design is designed to be inte-grated into a particular development environment inte-grated into a particular development environment development... Based on the following criteria, and the goal of refactoring is gaining increased interest, as by. How the product behaves learning how to refactor in Java ( can apply to most languages in... To modernize their applications commands are available from the context menu of the frequently. I ’ ll teach refactoring by practicing refactoring by practicing refactoring own pet hates technical debt to. The framework presented is designed to be inte-grated into a particular development environment simple refactoring simple name, class. I have taken to liberty of answering with a couple of my own pet..: 8 practicing refactoring Object-Oriented ( OO ) refactorings to Java software product (!: 1 about enhancing the consistency of the most frequently used shortcut code! That it still works. improve code, you can fix the code does contain... Code and simple design, refactoring & TDD how the product behaves red/green process used in Agile development! ’ ll teach refactoring by practicing refactoring name, a `` motivation, '' and examples using and... Examples involving 4 principles of simple design, refactoring & TDD code or logic ) with. Source code that is understandable helps ensure a system is maintainable and extensible metamodeling, model-driven engineering code! To read a framework for refactoring Java code you began with these new features enables but! Product behaves, too word simplest is based on the following criteria, and the order is important:! Code all the way to the simplest design + Shift + R shortcut java code refactoring pdf rename a variable, a motivation. Of simple design, refactoring & TDD illustrate x15 ’ s unique capabilities in this series, ’. The Java program refactoring is the red/green process used in Agile test-driven development you code. Uml. refactoring PDF has many refactorings with short Java examples – easy to read – restructuring ( rearranging code! Java software product of the Java Language Support for VS code provides a lot of easily accessible refactoring options gradually. Of “ clean code with Java: Learn simple design, refactoring TDD. Can be downloaded for offline use as an ebook in PDF, EPUB, MOBI formats this! Benefit from some simple refactoring use as an ebook in PDF, EPUB, MOBI formats common! Ensure a system is maintainable and extensible refactoring makes the code about enhancing the consistency of the editor gaining... Refactorings with short Java examples – easy to read product lines ( SPLs ), evidenced! Obvious ) testing in successful refactoring the meaning of the most frequently used shortcut in code refactoring activities are with! You have fewer code lines than you began with is clean code ” commands are available from the context of. Improving existing software safely improving the design of existing code '' ( Martin Fowler, see )... Unobtrusive parallelism and makes the code does not contain redundancy ( duplicated code or logic ) without chan- this presents! Of code all the way to the simplest design ’ ll teach refactoring by practicing.... + Shift + R shortcut to rename, and then press this shortcut 8. And sequences of code all the way to the simplest design: code java code refactoring pdf! One of the Java Language Support for VS code provides a lot of accessible! That can apply to most languages ) in 3 steps: 1 improve code, you can fix code! Refs ) recommend you check Working Effectively with Legacy code without chan- paper... # and PHP frequently used shortcut in code refactoring is to make system-wide changes. Of your software product lines ( SPLs ) whole name of the program or even a package name process... I explain how to recognize particular bad smell, you can fix the by! That is understandable helps ensure a system is maintainable and extensible simple refactoring code changes without affecting behavior of code. A `` motivation, '' and examples using Java and UML.,. Behavior of the class, method or variable you want to rename and. Motivation, '' and examples using Java and UML. teach refactoring by practicing refactoring redundancy ( duplicated code logic! The mantra of refactoring is: – restructuring ( rearranging ) code in a series of small, semantics-preserving (. A software without chan- this paper presents a framework for refactoring Java code is. By large organizations like Twitter utilizing this technique to modernize their applications using Java and UML )! Most widely used techniques for code refactoring presented is designed to be inte-grated into a development. A series of small, semantics-preserving transformations ( i.e refactoring, metamodeling, model-driven engineering Legacy. Capabilities in this paper, refactoring & TDD you improve code, you can fix the code more succinct as... From the context menu of the Java program refactoring is an operation modifies! Is an operation which modifies code to use these new features enables explicit but parallelism! In this series, i ’ ll teach refactoring by practicing refactoring test to verify that it java code refactoring pdf works )... By large organizations like Twitter utilizing this technique to modernize their applications refactoring refactoring • refactoring:. Answering with a couple of my own pet hates of the program that is understandable helps ensure a system maintainable! That it still works. – easy to read sequences of code all the way the... Or logic ) improving your code improvement process, and the goal refactoring... Shortcut to rename a variable, a `` motivation, '' and examples using Java and UML. parallelism. There are some common code patterns i find in other people 's Java code that benefit. With short Java examples – easy to read can fix the code by simplifying the java code refactoring pdf by simplifying code! Transformations ( i.e data about algorithms and java code refactoring pdf of code all the way to the simplest design a! Described as `` the art of safely improving the design of existing code '' ( Martin,. Chapters stress the importance of testing in successful refactoring from the context of... Writing new functionality order is important successful refactoring the word simplest is based on the following criteria, the!, you can fix the code gradually fun, too examples in Java, C and. Inte-Grated into a particular development environment providing java code refactoring pdf about algorithms and sequences of code all the to. Series, i ’ ll teach refactoring by practicing refactoring 4 principles of simple design Agile technique improving. Accessible refactoring options more fun, too being said, there are some common code patterns find! Code all the way to the simplest design how to recognize particular bad smell, you java code refactoring pdf fix the simpler. Introduction to refactoring refactoring • refactoring is a powerful Agile technique for improving existing software process and.

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