k1w1dev
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* Remove unused member which was also causing a false positive sonar issue. Fixes sonar issue https://sonarcloud.io/project/issues?open=AY3gHwu5DIZTZkppqVEG&id=iluwatar_java-design-patterns * Fixes sonar issue https://sonarcloud.io/project/issues?open=AXK0OzDA-CiGJS70dLki&id=iluwatar_java-design-patterns related to "Refactor the code of the lambda to not have multiple invocations throwing the same checked exception." Also, updated the code to use Instant and Duration to deal with time instead of int. Added the awaitility library to perform assertions in test which is more reliable than using Thread.sleep directly to wait for events to happen. * checkstyle fix * Add sneaky throws to fix sonar lint issue. This is fine as the newFile method is not being tested but instead the new SimpleFileWriter(...) is. * The first booking needs to happen outside the assertions. Fixed other warnings * Use records to pass around related objects instead of using a large number of individual params, which sonar did not like. * Checkstyle fixes * checkstyle fixes * Remove complexity to keep sonar happy. * Split into different methods to reduce complexity. Could be broken down even further but currently Sonar is happy. * Move files to correct package * Add valid assertions to tests * rename constants to avoid confusion * Sonar warning related to cognitive complexity can be suppressed as the methods are quite generic and not functional enough to be separated out. * Use constants to keep Sonar happy * Use correct constant naming conventions * Use correct constant naming conventions * Use lombok to define noargsconstructor * Use a single method to do the logging * Remove unused constructor and redundant method * Use a reusable method for logging
Design patterns implemented in Java
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Introduction
Design patterns are the best, formalized practices a programmer can use to solve common problems when designing an application or system.
Design patterns can speed up the development process by providing tested, proven development paradigms.
Reusing design patterns helps prevent subtle issues that cause major problems, and it also improves code readability for coders and architects who are familiar with the patterns.
Getting started
This site showcases Java Design Patterns. The solutions have been developed by experienced programmers and architects from the open-source community. The patterns can be browsed by their high-level descriptions or by looking at their source code. The source code examples are well commented and can be thought of as programming tutorials on how to implement a specific pattern. We use the most popular battle-proven open-source Java technologies.
Before you dive into the material, you should be familiar with various Software Design Principles.
All designs should be as simple as possible. You should start with KISS, YAGNI, and Do The Simplest Thing That Could Possibly Work principles. Complexity and patterns should only be introduced when they are needed for practical extensibility.
Once you are familiar with these concepts you can start drilling down into the available design patterns by any of the following approaches
- Search for a specific pattern by name. Can't find one? Please report a new pattern here.
- Using tags such as
Performance,Gang of FourorData access. - Using pattern categories,
Creational,Behavioral, and others.
Hopefully, you find the object-oriented solutions presented on this site useful in your architectures and have as much fun learning them as we had while developing them.
How to contribute
If you are willing to contribute to the project you will find the relevant information in our developer wiki. We will help you and answer your questions in the Gitter chatroom.
License
This project is licensed under the terms of the MIT license.
