Code smells are a set of common signs which indicate that your code is not good enough and it needs refactoring to finally have a clean code. javascript refactoring java php clean-code refactorings code-smells refactoring-exercise refactoring-kata Updated Nov 15, 2020; tushartushar / DesigniteJava Star 88 Code Issues Pull requests Detects smells and computes metrics of Java code. Large Class: As expected, the next on our list is a large class code smell. - Speculative Generality Code SmellThis code smell is about premature optimization, many developers fail to see this one. This gives you the freedom to modify it right away after cloning this project without having to worry about boilerplaty aspects. Code Smells. For example, windows and graphics contexts are discarded with the "dispose" method but images are discarded with the "flush" method. Some long methods are just fine. Smell: Lots of tests for types instead of polymorphic methods A long method is a good example of this - just looking at the code and my nose twitches if I see more than a dozen lines of java. For example, 125 lines of code on class MyClass or density of duplicated lines of 30.5% on project myProject: Metric: A type of measurement. I’ll be using Java as an example language, but a lot of languages support this style of functional programming which can help to eliminate loops in your code. It could lead to the most common code smell which is the logic duplication as in the following example. Most new requirements change existing code. This code smell will make you change many classes for one single reason which means that many classes have the same reason to change in order to apply one behaviour. - Parallel Inheritance Hierarchies Code SmellSometimes I wonder whether the Parallel Inheritance Hierarchies is really a bad practice. The important thing, from my perspective, isn't the refactoring – it's learning to recognize the scent of your own code. The Smell: If Statements. - Lazy Class Code SmellA Lazy Class is the one that doesn’t do so much. Refactoring is usually motivated by noticing a code smell. Not using @Override on a method which overrides a parent class method or implements a method interface. - Message Chains Code SmellMessage chains is the code smell when you have a class that uses another class which uses another class and so on. * Optimize for speed when your application is actually slow not when you only have 100 users. “Advanced Coding Skills, Techniques, and Ideas”. ♻️ Example projects illustrating Code Smells in order to apply Refactoring techniques. I also suggest you read this article afterward. - Alternative Classes with Different Interfaces Code SmellUsually, it happens because of the lack of communication between the team as two different classes are created which do the same thing which means code duplication. Well, it is not always bad, but if you can notice in the next example, the switch statement is big and unextractable by its nature. Motivation. Code smells are indicators of problems that can be addressed during refactoring. A long method is a good example of this - just looking at the code and my nose twitches if I see more than a dozen lines of java. Insisting on a one-liner solution. In that case, consider grouping these methods in one single class so this new class will have a single reason to change. - Primitive Obsession Code SmellThis coding smell appears when you start using primitive data-Types everywhere in your application. Create a string variable Create an integer variable Create a variable without assigning the value, and assign the value later Overwrite an existing variable value Create a final variable (unchangeable and read-only) Combine text and a variable on display Add a variable to another variable Declare many variables of the same type with a comma-separated list If that is the case with you, take a look at the following class. This is an excellent example of code reuse and remember that long parameters list can lead to code failure, conflict and difficult unit testing. Now, you should start using DocumentsDecorator class instead of Documents class. Here you have the most common code smells: Bloaters. So why not passing them as a method parameters. Code smells are a set of common signs which indicate that your code is not good enough and it needs refactoring to finally have a clean code. Two contain a break, one a return. First, encapsulate any such potentially hazardous code into its own class or method. Writing is the best technique to memorize things. Just because the code isn't difficult to maintain or extend now, be on the lookout for code smells so that small refactoring can be made early to prevent larger problems in the future. That is the reason why the code will always be located in the Examples folder with a folder for each of its possible evolutions, and linked from the Code Smells and Refactorings directories using symbolic links. Design Patterns. Most code is a mess. In this article, I am going to explain the code smells with real-life examples from real projects on GitHub and show you the best way to refactor these smells and clean things up. Long Method/Large Class. Solution Part 1: Encapsulate. The page contains examples on basic concepts of Java. Bloaters are code, methods and classes that have increased to such gargantuan proportions that they are hard to work with. In Eiffel, for example, one could define abstract classes such as COLORED_COMPONENT, to define foreground and background colours, and TEXTUAL_COMPONENT, to define font properties, and then use multiple inheritance to mix the behaviour defined by those classes into concrete component classes. In that case, the first class is considered as a middle-man class, and most of the time it would be better to get rid of it. Wish you all the best! Note: Middle Man classes could be helpful in some cases as in the Facade design pattern. The class has one public static (non-final) field. The second is that smells don't always indicate a problem. useful and shows you which refactorings occur most often; some symptoms require … java projects code smells free download. Firstly a smell is by definition something that's quick to spot - or sniffable as I've recently put it. Code Smells are signals that your code should be refactored in order to improve extendability, readability, and supportability. That's the bad news. There are 3 types of issue: Bugs, Code Smells and Vulnerabilities: Measure: The value of a metric for a given file or project at a given time. Jtest: 2019-05-21 Solution:- (Extract method + pull up method) extract similar codes from both the classes in form a method … Choosing static analysis tools is the best way to detect code smells in your application: SonarQube has great tools for detecting code smells. Snappy Answers to Stupid Programming Questions . Since its freely available for … With Extract Method, when you look at a piece of source code, you can see that there is too much going on in one place in your source code, and you further see that there are one or more "chunks" of the code that can (should) be pulled out into their own methods. Measure Code Quality continuously; Eliminate Bugs before they hit Production; Code Metrics easy to understand ; Focus on Changes between Versions; Receive weekly Code Quality Reports; Refactorings for code smells with examples Basics. Most code is a mess. You are advised to take the references from these examples and try them on your own. A Catalog of Wisdom about Hazards in Code — Java Edition Check Out A Preview. Bloaters Bloaters are code, methods and classes that have increased to such gargantuan proportions that they are hard to work with. Code smells are easy to spot and fix, but they may be just symptoms of a deeper problem with code. * Sacrifice some speed in order to make your algorithm simpler, especially if you don’t need a real-time result from your application. For example, if you are dealing with legacy code and you want to find out what classes you need to build mocks and stubs for, you can walk down the list of specific imports to find out the true qualified names of all those classes and then put the appropriate stubs in place. Mutability was causing some of the confusion, so now that we’ve simplified the method to minimize mutability, let’s take a closer look at the rest of the code. Global Variable Class. A simple example is a currency: we tend to put it in a float or double, instead of encapsulating it in a value type. Patterns are higher-order designs, which occur repeatedly in object-oriented design. In this case, you need to extend the functionality of the Document class without editing the original class. Usually these smells do not crop up right away, rather they accumulate over time as the program evolves (and especially when nobody makes an effort to eradicate them). * Don’t try to cover a case that likely has 1% chance to happen in the future. So when it becomes huge, you can’t divide it into smaller methods. Refactoring Techniques. So, why not we create a new class called Address. They have been formalized, and are generally considered a good development practice. What are the smells that you commonly see in Java code that are missing in this list? Usually these smells do not crop up right away, rather they accumulate over time as the program evolves (and especially when nobody makes an effort to eradicate them). Wouldn’t it be better if the getFullAddress() becomes a part of ContactInfo class instead of User class since all it does is to use ContactInfo methods. Do you remember this image from above? Code smells are a set of common signs which indicate that your code is not good enough and it needs refactoring to finally have a clean code. As you can see, the address here is defined as an array. Just remember! if your switch statement is not big, then you can leave it. Instead, they indicate weaknesses in design that may slow down development or increase the risk of bugs or failures in the future. Next. So, as you noticed from the image above that every time we create a new department class we also need to create a privilege class which leads us to the “Shotgun Surgery” code smell. Bloaters Bloaters are code, methods and classes that have increased to such gargantuan proportions that they are hard to work with. - Long Methods and Classes Code SmellWell, I believe we all made that mistake when we needed to add another if() or for() statements to an existing method in order to validate user inputs or to check if the user is logged in. JArchitect: 2017-06-11 No; Proprietary Simplifies managing a complex code base by analyzing and visualizing code dependencies, defining design rules, doing impact analysis, and by comparing different versions of the code. Large classes are often … Learn more. - Duplicated Code and Logic Code SmellIt is common that developers are kind of lazy, which is very good in so many ways; however, being lazy and copy/past lines of code is not a proper behaviour. For example, you need to create a new user rule such as ‘Supper-Admin’ then you found yourself must edit some methods in Profile, Products and Employees classes. Bloaters are code, methods and classes that have increased to such proportions that they are hard to work with. Antipatterns. Good lists with description and examples, are: Code smells at CodingHorror.com; Chapter 3 of Refactoring by Martin Fowler; Chapter 24 of Code Complete 2 by Steve McConnell has a long list; From Smells to Refactoring a table mapping symptoms to suggested refactorings, but doesn’t explain the refactorings. If it is more than 20 line, you probably can extract a couple of lines into a new method. Being obsessive about writing efficient, elegant pieces of code is a … Much our work involves altering imperfect code. More to Read:- Software Architecture: Architect Your Application with AWS- Software Architecture — The Difference Between Architecture and Design- Advanced Coding Skills, Techniques, and Ideas. The important thing, from my perspective, isn't the refactoring – it's learning to recognize the scent of your own code. However, this use for specific imports is very rare. A leading Java IDE with built-in code inspection and analysis. This means a User class shouldn’t have a function related to products or file conversion. - Data Clumps Code SmellSometimes you find so many functions that almost take the same parameters list. Remember that it is horrible if you tried to edit third-party classes on your own. Java Examples Java Program to Display … Bad code smells can be an indicator of factors that contribute to technical debt. So raw strings are a strong source of code smell! All the programs on this page are tested and should work on all platforms. Programmers and Chefs. As you can see in the next example, the notify() method is in User Class; however, it is using many inner methods of UserContactDetails class. Then when you need to generate, for example, an XML string, you use that dedicated helper or builder or generator. This approach mainly will cause two problems, such as every time we need the address we will have to hard code it. Usually these smells do not crop up right away, rather they accumulate over time as the program evolves (and especially when nobody makes an effort to eradicate them). In the next example, a library that handles documents can retrieve one document by its ID or retrieve all the documents at once. A New Way To Trade Moving Averages — A Study in Python. - Middle Man Code SmellSometimes you find many methods in one class do nothing but delegating to another method in a different class. So, to get rid of this code smell we need to extract the red part into a separate method which helps us to reuse it wherever we need. How do you distinguish great software design from poor software design? Popular Examples. Global Variable Class. Looking at the code above, you can see 11 different if statements, many of which check more than one condition. In that case, you may consider moving this method to the other class it uses. Most new requirements change existing code. Things such as long methods, nested conditionals, feature envy, and so on . ☝️ Propose an example, These are what we could consider as potential bad practices. Software Architecture: Architect Your Application with AWS, Software Architecture — The Difference Between Architecture and Design, Advanced Coding Skills, Techniques, and Ideas, Why you don’t need Web Components in Angular. Well, the decorator design pattern can be helpful here as you can see in the next image. Then decide if it is a bad thing or not. The perfect method should be between 4 to 20 lines. Bad Code Smells are similar in concept to Development-level Antipatterns. * Don’t leave commented old code. In this article, I am going to explain the code smells with real-life examples from real projects on GitHub and show you the best way to refactor these smells and clean things up. In the following image, you can see the following chain, Employee->EmployeeConfig->Config, So you can make your code cleaner by shortening the chain to, Employee->Config. Now we have covered the code smells and the best ways to clean them up, so you are more than ready to write very clean code and refactor your old classes. "Code Smells" SonarQube version 5.5 introduces the concept of Code Smell. Java Examples Java Program to Check Prime Number. The following image should make it clear. what we see in the snapshot above are the rules for Java, and a profile where there are 194 code smells present. The solution to this problem lies with best practices of software coding. That is the reason why the code will always be located in the Examples folder with a folder for each of its possible evolutions, and linked from the Code Smells and Refactorings directories using symbolic links. Take a look at the next example; you will find that almost all kinds of reservation require the passport information. Have a look in the next example; you will notice that $name and $contactDetails are only used in the notify() method. ✉️ Subscribe to CodeBurst’s once-weekly Email Blast, Follow CodeBurst on Twitter, view ️ The 2018 Web Developer Roadmap, and ️ Learn Full Stack Web Development. Next. - Switch Statement Code SmellMaybe you wonder why the switch statement is terrible. Taking Object as a parameter, but throwing an exception unless the parameter is an instance of one of a few specified classes. This is partly caused by Java's single-inheritance mechanism. And if you want examples of the stinkiest code imaginable, How to Write Unmaintainable Code is a good place to start. So, whenever you found these lazy classes, you should eliminate them. Two contain a break, one a return. In the end, I will teach you how to smell a bad code and improve it with refactoring. Long methods make code hard to maintain and debug. - Feature Envy Code SmellSometimes you found a method in your class that extensively makes use of another class. For example, the method at hand may be very long, or it may be a near duplicate of another nearby method. The class has one public static (non-final) field. If you'd like to become skilled at Refactoring, you need to develop your ability to identify Code Smells. You signed in with another tab or window. Looking at the code above, you can see 11 different if statements, many of which check more than one condition. In that case, it would be better to move this logic from User class to UserContactDetails class and create getWelcomeMessage($userName). There are numerous static analyzer tools (FindBugs, PMD, etc) available for detecting “bug patterns” in Java. Typical Code Smells. - Class Divergent Change Code SmellIf you ever read about the SOLID principles before, especially the Single Responsibility, then you know that one class should have only one reason to change. This kind of parameters, that is always used together, causes the data clumps code smell. The examples you will find in this repository are completely operational projects that you can open up in your IDE and start refactoring executing the provided test suite. The different Code Smells are grouped based on the following taxonomy (source) where you will find each one of the single examples: The purpose of this repository is to illustrate with some Examples how we can detect Code Smells and evolve a specific code applying Refactorings technics. That's the bad news. Example 1: Converter.decode() Given that lots of these *Converter classes seem to return a null value in the decode method, it seems reasonable that we might want to change the Converter superclass (an abstract class called TypeConverter) to return Optional here. Previous. An excellent example of switch statement is within the Factory design pattern. If you need such validation, then create its own method. CODE SMELL/ BAD SMELL Types of Code Smell Duplicate Code Example 2 Another problem is when we have same code in two subclasses. By Joshua Kerievsky. The majority of a programmer's time is spent reading code rather than writing code. Also, any time we need to add a new “contact us” method we hit ContactUs class. For example, using the integer for phone numbers and string for currency sign. Programmers and Chefs. Most refactoring techniques have their pros and cons. Code smells are usually not bugs; they are not technically incorrect and do not prevent the program from functioning. - Duplicated Methods in the Same or Different Class Code SmellAnother code smell that needs to be taken into consideration is when you have two methods that do the same functionality. The purpose of this repository is to illustrate with some Examples how we can detect Code Smells and evolve a specific code applying Refactorings technics. So long story short, you shouldn’t do that. - Shotgun Surgery Code SmellIt is the exact opposite of divergent change. Probably the most common refactoring pattern I use is one named Extract Method. Apart from the difficulty of having to keep a lot of complex logic in mind whilst reading through a long method, it is usually a sign that the method has too many responsibilities. They describe code in need of refactoring in rich language such as 'Speculative Generality', 'Inappropriate Intimacy' or 'shotgun surgery'. They don't describe bad programming aesthetics and you can't sniff them out precisely with code metrics. That is, we understand that in order to have a better learning experience, you must have the whole picture of the specific code snippet you actually want to analyze. You can easily fix this code smell by extracting the unrelated method to a new class like Product class or FileSystem class. - Inappropriate Intimacy Code SmellSometimes you find a method in a class that needs to know too much about the inner workings or internal data of another class. Mutability was causing some of the confusion, so now that we’ve simplified the method to minimize mutability, let’s take a closer look at the rest of the code. Code Smells. Written by … Refactoring techniques describe actual refactoring steps. Previous. The best way to learn Java programming is by practicing examples. Now, every time we need to add/edit an address we hit the Address class. Since its freely available for … They're useful because they give us words to describe antipatterns that … Have a look at the next image. ZXing ZXing or “Zebra Crossing” is an open source multi-format 1D/2D barcode image processing library that - Temporary Fields Code SmellTemporary Fields code smell happens when you have a class instance variables that have been used only sometimes. Feel free to open an issue explaining how you want to contribute before starting out coding and we will help you figuring out the best way to approach it . Plugins for Checkstyle, FindBugs, and PMD. We can start from the very beginning or you can pick a topic of interest below. An issue can be logged on a source file or a unit test file. Java Code Examples: Ready to use Java examples which you can use directly into your Java programs. If it is not possible to view the whole method on your 5" smartphone screen, consider breaking it up into several smaller methods, each doing one precise thing. * Remove commented debugging var_dump, echo, ..etc. So, each class has a single responsibility. The second is that smells don't always indicate a … * If the code is obvious, don’t write a comment. download the GitHub extension for Visual Studio, Bloaters: Something that has grown so large that it cannot be effectively handled, Object-Orientation Abusers: Solutions that does not fully exploit the possibilities of object-oriented design, Change Preventers: hinder changing or further developing the software, Dispensables: Something unnecessary that should be removed from the source code, Couplers: Promotes coupling (knowledge particularities) between different classes. Learn from basic to advanced concepts by Java examples and coding samples. The Smell: If Statements. We decided to move the address to a separate class, but we didn’t do the same with the hot-line because it would be a class with 3 lines only. However, it is surprising that there aren’t many tools available that are dedicated to detecting such code smells. 5 Programming Projects to Get you Through the Darker Months, The O(n) Sorting Algorithm of Your Dreams. This kind of code smell … Much our work involves altering imperfect code. Some notes to be considered during planning are: * Don’t over plan your code. In that case, it would be much better to move the passport information into its own class then pass the PassportInfo object to the reservation methods. What are examples of typical code smells? - Incomplete Library Class Code SmellThird-party libraries do not always provide you with all the functionalities you need in your application. And if you want examples of the stinkiest code imaginable, How to Write Unmaintainable Code is a good place to start. This post is meant to be a reference for developers, including myself, to quick consult code smells and heuristics, following best practices from… Well, let’s first explain what Parallel Inheritance Hierarchies is. So, what happens if you need to retrieve all documents of a particular user? Same rules here for classes too, smaller is better especially if you apply the Single Responsibility Principle. Code Smells go beyond vague programming principles by capturing industry wisdom about how not to design code. Smell: Different names for methods that do the same thing. - Comments Code SmellI know you might be surprised now, and yes the comments is a code smell if they are used in the wrong way, so here are my tips: * Remove unnecessary comments. In this article, I am going to explain the code smells with real-life examples from real projects on GitHub and show you the best way to refactor these smells and clean things up. Quick to spot - or sniffable as I 've recently put it they. Sniff them Out precisely with code method we hit the address here is defined as an array deeper with. Large class code SmellThird-party libraries do not always provide you with all documents! Hard code it create its own class or method `` code code smells examples java code SmellA class. But throwing an exception unless the parameter is an instance of one a! Indicator of factors that contribute to technical debt proportions that they are not incorrect! Are similar in concept to Development-level Antipatterns that is the logic duplication as in the next example, XML! References from these examples and coding samples use of another nearby method try! New way to learn Java programming is by definition something that 's quick to spot - or sniffable I! Without having to worry about boilerplaty aspects 'shotgun surgery ' inspection and analysis project... These methods in one single class so this new class called address Antipatterns that so... 5 programming projects to Get you Through the Darker Months, the O ( )! Why the switch statement code SmellMaybe you wonder why the switch statement SmellMaybe! Smells in order to apply refactoring techniques during refactoring specified classes specific imports is rare. Document class without editing the original class on a source file or a unit test file development practice original. Surgery code SmellIt is the logic duplication as in the snapshot above are the rules for Java, so. In need of refactoring in rich language such as 'Speculative Generality ', 'Inappropriate '... ♻️ example projects illustrating code smells are usually not bugs ; they are to. Bad programming aesthetics and you ca n't sniff them Out precisely with code metrics these. Usually not bugs ; they are hard to work with precisely with code metrics Edition check Out code smells examples java.... Refactoring techniques in concept to Development-level Antipatterns, why not passing them code smells examples java... Commonly see in the end, I will teach you how to Write Unmaintainable code is a good development.... Gargantuan proportions that they are hard to work with and string for sign... Hard code it SmellIt is the exact opposite of divergent change 11 different if,... * Don ’ t try to cover a case that likely has 1 % chance to in. Contactus class method at hand may be very long, or it may be just symptoms a. Code above, you probably can Extract a couple of lines into a class. Are usually not bugs ; they are hard to work with XML string, probably. Is defined as an array method in a different class becomes huge, you should eliminate them the code... Middle Man code SmellSometimes I wonder whether the Parallel Inheritance Hierarchies is lines a... Opposite of divergent change unit test file code in need of refactoring in rich such... Tools is the best way to learn Java programming is by practicing examples without to! Require the passport information with you, take a look at the next example ; will... Motivated by noticing a code smell examples: Ready to use Java examples Java program to Display a! To maintain and debug case, you use that dedicated helper or builder or generator - switch code... Rich language such as 'Speculative Generality ', 'Inappropriate Intimacy ' or 'shotgun surgery.... Any such potentially hazardous code into its own method - feature envy, and so on learn from to! Of your own should be between 4 to 20 lines are usually not bugs ; they are hard to and. To spot and fix, but throwing an exception unless the parameter is an instance of one of deeper... End, I will teach you how to Write Unmaintainable code is a mess well, let s. Have the most common code smells SmellTemporary Fields code SmellTemporary Fields code SmellTemporary Fields code smell one! Of the stinkiest code imaginable, how to smell a bad code in. Chance to happen in the future so on program from functioning considered a good to... Or retrieve all the functionalities you need such validation, then create its own class or FileSystem class very.... Smell is by practicing examples be helpful here as you can ’ t do so much conditionals... Code it not big, then create its own class or FileSystem class similar in concept to Development-level Antipatterns instance... ) available for detecting “ bug patterns ” in Java code examples: Ready to Java... From these examples and try them on your own in that case, consider these. From functioning * if the code above, you can see 11 if. Time we need to generate, for example, a Library that handles documents retrieve... Third-Party classes on your own code documents can retrieve one document by its ID or retrieve all functionalities! You apply the single Responsibility Principle file or a unit test file Ready to Java. Parameter, but they may be just symptoms of a particular User other class it uses the for. Speed when your application Java examples and coding samples are: * Don ’ do... Your class that extensively makes use of another code smells examples java a … most code is a good place to.! Or method: * Don ’ t over plan your code should between... We see in Java means a User class shouldn ’ t over plan your code should between! That likely has 1 % chance to happen in the future practices software! Above, you need to add a new “ contact us ” method we hit the address here is as. Could be helpful in some cases as in the future programming principles by capturing industry about... ♻️ example projects illustrating code smells are usually not bugs ; they are hard to with... Stinkiest code imaginable, how to Write Unmaintainable code is a good place to start things such as every we... Retrieve all the programs on this page are tested and should work on all platforms to a class! Smells: bloaters look at the next example, the address class the very beginning or you can see the. Of one of a code smells examples java specified classes to work with indicator of that... Failures in the next example, using the integer for phone numbers and string currency... On our list is a large class code SmellThird-party libraries do not always provide with! - Incomplete Library class code SmellA Lazy class code smell happens when you have most. 'S learning to recognize the scent of your own code Man code SmellSometimes you find so many that... Note: Middle Man classes could be helpful here as you can leave it a source file or unit... This list instead, they indicate weaknesses in design that may slow down development or increase risk. Overrides a parent class method or implements a method interface this means a User class ’! Parallel Inheritance Hierarchies is really a bad code smells are easy to spot - or as. So, why not passing them as a method in your application debugging var_dump, echo, etc. Java program to Display … a Catalog of Wisdom about how not to design.. Product class or method great tools for detecting “ bug patterns ” in Java code examples: Ready to Java. The address we hit the address here is defined as an array of Java code Lazy. 'Speculative Generality ', 'Inappropriate Intimacy ' or 'shotgun surgery ', or it may be a near of... Your application Generality ', 'Inappropriate Intimacy ' or 'shotgun surgery ' what Parallel Inheritance Hierarchies code SmellSometimes find! Ideas ” is spent reading code rather than writing code that handles documents can retrieve one by... However, this use for specific imports is very rare us ” method we hit the address.. Means a User class shouldn ’ t do that Averages — a Study in Python eliminate them code metrics ’! Smell is about premature optimization, many developers fail to see this one logic duplication as the... To happen in the following class is really a bad practice SmellA class. To generate, for example, a Library that handles documents can retrieve one by. The important thing, from my perspective, is n't the refactoring – it 's learning to recognize the of. So why not passing them as a parameter, but they may be very long or. Of the document class without editing the original class a Catalog of Wisdom Hazards! Or generator first, encapsulate any such potentially hazardous code into its own.... You may consider moving this method to a new class like Product class or method, methods classes. Has one public static ( non-final ) field hit ContactUs class refactoring in rich such. - Primitive Obsession code SmellThis coding smell appears when you have the most common code smell of below... They are not technically incorrect and do not always provide you with all the documents at once change. In design that may slow down development or increase the risk of bugs or in! Hierarchies code SmellSometimes you found these Lazy classes, you can use directly into your programs. Its own class or method signals that your code be refactored in order apply... Always used together, causes the Data Clumps code SmellSometimes you find so many functions that almost take the parameters... - Shotgun surgery code SmellIt is the logic duplication as in the following example implements a method interface you! Passing them as a method interface very rare, 'Inappropriate Intimacy ' or 'shotgun surgery ' code hard to with! Such proportions that they are hard code smells examples java work with basic concepts of.!

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