maintenance

.github/workflows/codeql.yml

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+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  schedule:
+    - cron: '31 2 * * 4'
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    # Runner size impacts CodeQL analysis time. To learn more, please see:
+    #   - https://gh.io/recommended-hardware-resources-for-running-codeql
+    #   - https://gh.io/supported-runners-and-hardware-resources
+    #   - https://gh.io/using-larger-runners (GitHub.com only)
+    # Consider using larger runners or machines with greater resources for possible analysis time improvements.
+    runs-on: ${{ (matrix.language == 'swift' && 'macos-latest') || 'ubuntu-latest' }}
+    timeout-minutes: ${{ (matrix.language == 'swift' && 120) || 360 }}
+    permissions:
+      # required for all workflows
+      security-events: write
+
+      # only required for workflows in private repositories
+      actions: read
+      contents: read
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - language: csharp
+          build-mode: autobuild
+        - language: java-kotlin
+          build-mode: none # This mode only analyzes Java. Set this to 'autobuild' or 'manual' to analyze Kotlin too.
+        # CodeQL supports the following values keywords for 'language': 'c-cpp', 'csharp', 'go', 'java-kotlin', 'javascript-typescript', 'python', 'ruby', 'swift'
+        # Use `c-cpp` to analyze code written in C, C++ or both
+        # Use 'java-kotlin' to analyze code written in Java, Kotlin or both
+        # Use 'javascript-typescript' to analyze code written in JavaScript, TypeScript or both
+        # To learn more about changing the languages that are analyzed or customizing the build mode for your analysis,
+        # see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/customizing-your-advanced-setup-for-code-scanning.
+        # If you are analyzing a compiled language, you can modify the 'build-mode' for that language to customize how
+        # your codebase is analyzed, see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: ${{ matrix.language }}
+        build-mode: ${{ matrix.build-mode }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+
+        # For more details on CodeQL's query packs, refer to: https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning#using-queries-in-ql-packs
+        # queries: security-extended,security-and-quality
+
+    # If the analyze step fails for one of the languages you are analyzing with
+    # "We were unable to automatically build your code", modify the matrix above
+    # to set the build mode to "manual" for that language. Then modify this step
+    # to build your code.
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
+    - if: matrix.build-mode == 'manual'
+      run: |
+        echo 'If you are using a "manual" build mode for one or more of the' \
+          'languages you are analyzing, replace this with the commands to build' \
+          'your code, for example:'
+        echo '  make bootstrap'
+        echo '  make release'
+        exit 1
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
+      with:
+        category: "/language:${{matrix.language}}"

.github/workflows/maven.yml

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+# This workflow will build a Java project with Maven, and cache/restore any dependencies to improve the workflow execution time
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-java-with-maven
+
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up JDK 17
+      uses: actions/setup-java@v3
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+        cache: maven
+    - name: Build with Maven
+      run: sh maven.sh
+
+    # Optional: Uploads the full dependency graph to GitHub to improve the quality of Dependabot alerts this repository can receive
+    - name: Update dependency graph
+      uses: advanced-security/maven-dependency-submission-action@571e99aab1055c2e71a1e2309b9691de18d6b7d6

.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+.idea/*
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
+=======
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+
+*.suo
+*.user
+.vs/
+[Bb]in/
+[Oo]bj/
+_UpgradeReport_Files/
+[Pp]ackages/
+
+Thumbs.db
+Desktop.ini
+.DS_Store
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*

README.md

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+[![Java CI with Maven](https://github.com/ibrahimatay/Design-Patterns/actions/workflows/maven.yml/badge.svg)](https://github.com/ibrahimatay/Design-Patterns/actions/workflows/maven.yml) [![.NET](https://github.com/ibrahimatay/Design-Patterns/actions/workflows/dotnet.yml/badge.svg)](https://github.com/ibrahimatay/Design-Patterns/actions/workflows/dotnet.yml)
+# Design Patterns For Humans
+Examples of design patterns in Java and C# are presented in a way that is easy for humans to understand and implement. The purpose of these examples is to provide a practical and intuitive guide to the use of design patterns in Java, helping developers improve their skills and create more effective and maintainable software.
+
+![image](/docs/images/desing-pattern-relationships.jpeg) 
+
+## ***Creational***
+- Factory Method                    ([Java](/Java/factory-method), [C#](/Csharp/DesignPatterns.FactoryMethod))        
+- Abstract Factory                  ([Java](/Java/abstract-factory), [C#](/Csharp/DesignPatterns.AbstractFactory))      
+- Builder                           ([Java](/Java/builder), [C#](/Csharp/DesignPatterns.Builder))        
+- Prototype                         ([Java](/Java/prototype), [C#](/Csharp/DesignPatterns.Prototype))    
+- Singleton
+  - Eager Instantiation             ([Java](/Java/singleton-eager-instantiation), [C#](/Csharp/DesignPatterns.SingletonEagerInstantiation))      
+  - Lazy Instantiation              ([Java](/Java/singleton-lazy-instantiation),  [C#](/Csharp/DesignPatterns.SingletonLazyInitialization))      
+  - Enum-based Singleton            ([Java](/Java/singleton-with-enum))     
+  - Double-Checked Locking with Singleton ([C#](/Csharp/DesignPatterns.DoubleCheckedLockingwithSingleton/))       
+
+## ***Structural***
+- Adapter                           ([Java](/Java/adapter), [C#](/Csharp/DesignPatterns.Adapter))               
+- Proxy                             ([Java](/Java/proxy), [C#](/Csharp/DesignPatterns.Proxy))   
+- Facade                            ([Java](/Java/facade), [C#](/Csharp/DesignPatterns.Facade))        
+- Composite                         ([Java](/Java/composite), [C#](/Csharp/DesignPatterns.Composite))      
+- Bridge                            ([Java](/Java/bridge), [C#](/Csharp/DesignPatterns.Bridge))   
+- Flyweight                         ([Java](/Java/flyweight), [C#](/Csharp/DesignPatterns.Flyweight))             
+- Decorator                         ([Java](/Java/decorator), [C#](/Csharp/DesignPatterns.Decorator))     
+
+## ***Behavioral***
+- Command                           ([Java](/Java/command), [C#](/Csharp/DesignPatterns.Command))      
+- Iterator                          ([Java](/Java/iterator), [C#](/Csharp/DesignPatterns.Iterator))     
+- Memento                           ([Java](/Java/memento), [C#](/Csharp/DesignPatterns.Memento))        
+- Observer                          ([Java](/Java/observer) [C#](/Csharp/DesignPatterns.Observer)) 
+- Strategy                          ([Java](/Java/strategy), [C#](/Csharp/DesignPatterns.Strategy)) 
+- Template Method                   ([Java](/Java/template-method), [C#](/Csharp/DesignPatterns.TemplateMethod)) 
+- Visitor                           ([Java](/Java/visitor), [C#](/Csharp/DesignPatterns.Visitor))   
+- Chain of Responsibility           ([Java](/Java/chain-of-responsibility), [C#](/Csharp/DesignPatterns.ChainOfResponsibility))   
+- Pipeline                          ([Java](/Java/pipeline), [C#](/Csharp/DesignPatterns.Pipeline))
+- State                             ([Java](/Java/state), [C#](/Csharp/DesignPatterns.State))
+- Mediator                          ([Java](/Java/mediator), [C#](/Csharp/DesignPatterns.Mediator)) 
+
+## References
+Design patterns in this repository are based on
+
+* [Design Patterns by The "Gang of Four"]
+* [Head First: Design Patterns]
+* [Wikipedia]
+* [Other Documents]
+
+[Design Patterns by The "Gang of Four"]: https://en.wikipedia.org/wiki/Design_Patterns
+[Head First: Design Patterns]: http://www.headfirstlabs.com/books/hfdp/ 
+[Wikipedia]: https://en.wikipedia.org/wiki/Software_design_pattern
+[Other Documents]: docs

abstract-factory/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>design-patterns</artifactId>
+        <groupId>com.ibrahimatay</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>abstract-factory</artifactId>
+
+    <properties>
+        <maven.compiler.source>${java.source.version}</maven.compiler.source>
+        <maven.compiler.target>${java.target.version}</maven.compiler.target>
+    </properties>
+
+</project>

abstract-factory/src/main/java/com/ibrahimatay/Main.java

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+package com.ibrahimatay;
+
+interface Command {
+    void execute(String query);
+}
+
+interface Connection {
+    void connect();
+    void disconnect();
+}
+
+interface DatabaseFactory {
+    Connection createConnection();
+    Command createCommand(Connection connection);
+}
+
+class Db2Command implements Command {
+    @Override
+    public void execute(String query) {
+        System.out.println("Db2 query executed");
+    }
+}
+
+class Db2Connection implements Connection {
+
+    @Override
+    public void connect() {
+        System.out.println("Connection is connected.");
+    }
+
+    @Override
+    public void disconnect() {
+        System.out.println("Connection is disconnected.");
+    }
+}
+
+class Db2DatabaseFactory implements DatabaseFactory {
+
+    @Override
+    public Connection createConnection() {
+        return new Db2Connection();
+    }
+
+    @Override
+    public Command createCommand(Connection connection) {
+        if(connection == null) {
+            throw new NullPointerException();
+        }
+        return new Db2Command();
+    }
+}
+
+public class Main {
+    public static void main(String[] args) {
+        DatabaseFactory db2DatabaseFactory = new Db2DatabaseFactory();
+        Connection connection = db2DatabaseFactory.createConnection();
+        Command command = db2DatabaseFactory.createCommand(connection);
+
+        connection.connect();
+        command.execute("select * from product");
+        connection.disconnect();
+    }
+}

adapter/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>design-patterns</artifactId>
+        <groupId>com.ibrahimatay</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>adapter</artifactId>
+
+    <properties>
+        <maven.compiler.source>${java.source.version}</maven.compiler.source>
+        <maven.compiler.target>${java.target.version}</maven.compiler.target>
+    </properties>
+
+</project>