SOLID Priciples, New example for Strategy Pattern

Author: PrathameshDhande22

content/Strategy Pattern.md

@@ -1,12 +1,12 @@
 #behavioral
 ## Definition
 
-It Defines a family of algorithms encapsulates each one, and makes them interchangeable. Strategy Lets the algorithms vary independently from clients that use it. 
+It defines a family of algorithms, encapsulates each one, and makes them interchangeable. The **Strategy Pattern** allows algorithms to vary independently from the clients that use them.
 
 ---
 ## Real World Analogy - 1
 
-Consider creating a Duck application with different types of ducks that can quack and fly. A simple approach would be to create a base class called `Duck` with methods like `fly` and `quack`, and then implement these methods in the specific types of ducks.
+Consider creating a **Duck** application with different types of ducks that can quack and fly. A simple approach would be to create a base class called `Duck` with methods like `fly()` and `quack()`, then implement these methods in specific duck types.
 
 ```mermaid
 ---
@@ -31,7 +31,9 @@ classDiagram
 ```
 
 > [!Question] What is Wrong With These Approach ?
-> You have implemented a base class called `Duck`, where methods like `fly` and `quack` are already defined. For example, the base class `Duck` has a default implementation of flying. However, in the case of a `RubberDuck` class, the duck cannot quack or fly. To modify this behavior, you would need to rewrite the `fly` and `quack` methods, which becomes inefficient when dealing with dozens of duck types. To address this issue, you can use the **Strategy Pattern**.
+> You have implemented a base class called `Duck`, where methods like `fly()` and `quack()` are already defined. For example, the base class `Duck` has a default implementation of flying. However, in the case of a `RubberDuck` class, the duck **cannot** quack or fly.
+>
+>To modify this behavior, you would need to override the `fly()` and `quack()` methods, which becomes inefficient when dealing with dozens of duck types. To address this issue, you can use the **Strategy Pattern**.
 
 Let's see the Implementation via Strategy Pattern:
 ```mermaid
@@ -93,10 +95,16 @@ classDiagram
     Duck <|-- MallardDuck
     Duck <|-- RubberDuck
 ```
-Here, we create two interfaces: `FlyBehavior` and `QuackBehavior`, which define the methods for flying and quacking. By implementing these interfaces, you can create new behaviors. In the abstract base class `Duck`, you use these interfaces in the constructor, allowing you to change the behavior dynamically or even implement a new duck type by passing specific behaviors or custom behaviors.
+Here, we create two interfaces:
+- `FlyBehavior`, which defines different flying behaviors.
+- `QuackBehavior`, which defines different quacking behaviors.
+
+By implementing these interfaces, you can create new behaviors independently. The **abstract base class `Duck`** uses these interfaces in the constructor, allowing you to dynamically change behaviors or even create a new duck type by passing specific or custom behaviors.
+
+Now, instead of modifying the base `Duck` class for every new type, you can simply create new behavior implementations and **plug them in**—making the system more flexible and scalable!
 
 ---
-## Code in Java
+### Code in Java
 
 Below is the Code for the above Strategy Pattern we discussed over Here. 
 ```java
@@ -207,4 +215,52 @@ public class Index {
 ---
 ## Real World Analogy - 2
 
-Let's take the another Example of the Logging Framework. 
+Let's take another example: the **Logging Framework**.
+
+This type of pattern is commonly used in logging frameworks, where you only pass the **Logger Interface** and call the `log()` method. The rest is handled by the class that implements the interface.
+
+Suppose an application uses an `ILogger` interface, which declares methods like `LogInfo()`, `LogError()`, and `LogDebug()`. The logger can have multiple implementations, such as `ConsoleLogger`, `FileLogger`, `JsonLogger`, or `DBLogger`.
+
+Using this approach, there is **no need to modify** all the methods in the application when changing the type of logger. You only need to **switch to a new logger** by defining it in the configuration section, while the rest is managed by the respective logging class.
+
+Below is the **class diagram** illustrating this approach.
+```mermaid
+---
+title: Logger Framework Design
+---
+
+classDiagram
+	class ILogger{
+		<<interface>>
+		+LogInf() void
+		+LogError() void
+		+LogWarning() void
+		+LogDubug() void
+	}
+
+	class FileLogger{
+		+LogInf() void
+		+LogError() void
+		+LogWarning() void
+		+LogDubug() void
+	}
+
+	class ConsoleLogger{
+		+LogInf() void
+		+LogError() void
+		+LogWarning() void
+		+LogDubug() void
+	}
+
+	ILogger <|-- FileLogger
+	ILogger <|-- ConsoleLogger
+
+	class Application{
+		-logger ILogger 
+		+PerformOperation() void
+		+KillProcess() void
+	}
+
+	
+```
+---

content/index.md

@@ -4,7 +4,6 @@ title: Design Patterns
 ### What is Design Pattern ?
 
 **Design patterns** are typical solutions to commonly occurring problems in software design. They are like pre-made blueprints that you can customize to solve a recurring design problem in your code.
-
 ## Three Main Patterns
 
 - **Creational patterns** provide object creation mechanisms that increase flexibility and reuse of existing code.
@@ -81,9 +80,38 @@ class MessageService {
 Now, you can add as many providers as needed, and `MessageService` will continue to work without being tightly coupled to `EmailClient`.
 
 ---
-## SOLID Principle
-
-
+## ## SOLID Principles
+
+The **SOLID** principles are five key object-oriented design principles that should be followed when creating a class structure. Let’s go through each principle one by one:
+### 1. Single Responsibility Principle (SRP)
+This principle states that a class should have only one responsibility and, therefore, only one reason to change.
+
+**Example:**  
+Consider a `Book` class that contains all the methods and variables related to a book. You should not include code related to a `Student` class or methods that are not relevant to the `Book` class.
+### 2. Open-Closed Principle (OCP)
+This principle states that a class should be **open for extension but closed for modification**. Modification refers to changing the code of an existing class, while extension means adding new functionality without altering the existing code.
+
+**Example:**  
+If you have a well-tested and reliable class, modifying its code can introduce bugs and potential system crashes. Instead, you should extend the functionality using **abstract classes** or **interfaces** rather than modifying the tested code directly.
+### 3. Liskov Substitution Principle (LSP)
+This principle states that **subtypes of a base class must be substitutable without altering the correctness of the program**.
+
+**Example:**  
+Consider an abstract or base class `Shape` with a method to calculate the area. If you create a `Rectangle` class by inheriting from `Shape`, calling the area calculation method on a `Rectangle` object (using a `Shape` reference) should return the expected result without requiring changes to the base class.
+### 4. Interface Segregation Principle (ISP)
+This principle states that **a class should not be forced to implement interfaces it does not use**. It is better to have multiple **smaller, specific interfaces** rather than a large, general-purpose interface.
+
+**Example:**  
+Consider a `Programmer` class with methods like `work()`, `eat()`, `test()`, and `assign()`, all declared in an `IEmployee` interface. The problem arises when you introduce `Manager` and `TeamLead` classes—they require the `assign()` method, but it doesn't belong in the `Programmer` class. To fix this, you can **segregate** the interfaces:
+- Common employee methods go in the `IEmployee` interface.
+- Management-related methods go in an `IManage` interface.
+
+This way, only relevant methods are implemented by each class.
+### 5. Dependency Inversion Principle (DIP)
+This principle states that **high-level modules should not depend on low-level modules; instead, both should depend on abstractions (interfaces or abstract classes)**.
+
+**Example:**  
+Consider an `SQLManager` class that performs CRUD operations. It has an `ILogger` interface for logging, which allows you to use different loggers like `FileLogger`, `ConsoleLogger`, or `TableLogger`. Since the `SQLManager` depends on the abstraction (`ILogger`) rather than a specific logging implementation, you can switch loggers without breaking the system.
 
 ---
 ## Contents:

public/Strategy-Pattern.html

@@ -21,7 +21,7 @@
     <title>Strategy Pattern</title>
     <link>https://https://prathameshdhande22.github.io/Java-Tutorial/Strategy-Pattern</link>
     <guid>https://https://prathameshdhande22.github.io/Java-Tutorial/Strategy-Pattern</guid>
-    <description>behavioral Definition It Defines a family of algorithms encapsulates each one, and makes them interchangeable. Strategy Lets the algorithms vary independently from clients that use it.</description>
+    <description>behavioral Definition It defines a family of algorithms, encapsulates each one, and makes them interchangeable. The Strategy Pattern allows algorithms to vary independently from the clients that use them.</description>
     <pubDate>Tue, 14 Jan 2025 18:41:56 GMT</pubDate>
   </item><item>
     <title>Design Patterns</title>

public/index.html

@@ -0,0 +1,7 @@
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