Add platform-specific instructions for running API Dash-generated Java

Add platform-specific instructions for running API Dash-generated Java code using AsyncHttpClient, HttpClient, OkHttp3, and Unirest libraries.

doc/user_guide/instructions_to_run_generated_code.md

@@ -79,19 +79,184 @@ TODO
 
 ## Java (asynchttpclient)
 
-TODO
+Here are the detailed instructions for running the generated API Dash code in **Java (using `AsyncHttpClient`)** for macOS, Windows, and Linux:
+
+---
+
+### **1. Install Java**  
+To run Java code, you need to have Java Development Kit (JDK) installed on your system.  
+
+- Visit the official **[Java Downloads Page](https://www.oracle.com/in/java/technologies/downloads/#jdk23)** and follow the instructions to install the latest JDK on macOS, Windows, or Linux.  
+
+After installation, verify it by running:  
+```bash
+java -version
+```
+
+---
+
+### **2. Add the `AsyncHttpClient` Library**  
+To use the `AsyncHttpClient` library in Java, you need to add it as a dependency in your project.  
+
+#### Using **Maven**:  
+1. Add the following dependency to your `pom.xml` file:  
+   ```xml
+    <dependencies>
+      <dependency>
+          <groupId>org.asynchttpclient</groupId>
+          <artifactId>async-http-client</artifactId>
+          <version>3.0.1</version>
+      </dependency>
+    </dependencies>
+   ```
+3. Save the file and run:  
+   ```bash
+   mvn install
+   ```
+
+#### Using **Gradle**:  
+1. Add the following line to the `dependencies` section in your `build.gradle` file:  
+   ```gradle
+    implementation 'org.asynchttpclient:async-http-client:3.0.1'
+   ```  
+2. Run the following command to fetch the dependency:  
+   ```bash
+   gradle build
+   ```
+
+---
+
+### **3. Run the Generated Code**  
+After setting up Java and adding the `AsyncHttpClient` library, follow these steps to execute the generated code:  
+
+1. **Create a new Java file**: Save the generated code into a file with a `.java` extension, such as `ApiTest.java`.  
+2. **Compile the file**: Use the following command in the terminal:  
+   ```bash
+   javac ApiTest.java
+   ```  
+3. **Run the compiled program**:  
+   ```bash
+   java ApiTest
+   ```
+
+---
 
 ## Java (HttpClient)
 
-TODO
+Here are the detailed instructions for running the generated API Dash code in **Java (using `HttpClient`)** for macOS, Windows, and Linux:
+
+---
+
+### **1. Install Java**  
+👉 Follow the instructions provided above under **Java (AsyncHttpClient)** for detailed steps on how to install the Java Development Kit (JDK) on macOS, Windows, or Linux.  
+
+---
+
+### **2. `HttpClient` Setup**  
+The `HttpClient` library is included as part of the **Java SE 11** (or later) standard library.  
+- Ensure you have **Java 11** or a later version installed to use `HttpClient` without needing additional dependencies.
+   
+
+To confirm your Java version, run:  
+```bash
+java -version
+```  
+---
+
+### **3. Run the Generated Code**  
+👉 Refer to the instructions above under **Java (AsyncHttpClient)** for steps to save, compile, and execute the Java code.  
+
+---
 
 ## Java (okhttp3)
 
-TODO
+Here are the detailed instructions for running the generated API Dash code in **Java (using `okhttp3`)** for macOS, Windows, and Linux:
+
+---
+
+### **1. Install Java**  
+👉 Follow the instructions provided above under **Java (AsyncHttpClient)** for detailed steps on how to install the Java Development Kit (JDK) on macOS, Windows, or Linux.
+
+---
+
+### **2. Add the `okhttp3` Library**  
+To use `okhttp3` in Java, you need to add it as a dependency in your project.  
+
+#### Using **Maven**:  
+1. Add the following dependency to your `pom.xml` file:  
+   ```xml
+   <dependency>
+       <groupId>com.squareup.okhttp3</groupId>
+       <artifactId>okhttp</artifactId>
+       <version>4.12.0</version>
+   </dependency>
+   ```  
+2. Save the file and run:  
+   ```bash
+   mvn install
+   ```
+
+#### Using **Gradle**:  
+1. Add the following line to the `dependencies` section in your `build.gradle` file:  
+   ```gradle
+   implementation 'com.squareup.okhttp3:okhttp:4.12.0'
+   ```  
+2. Run the following command to fetch the dependency:  
+   ```bash
+   gradle build
+   ```
+
+---
+
+### **3. Run the Generated Code**  
+👉 Refer to the instructions provided above under **Java (AsyncHttpClient)** for steps to save, compile, and execute the Java code.
+
+---
 
 ## Java (Unirest)
 
-TODO
+Here are the detailed instructions for running the generated API Dash code in **Java (using `Unirest`)** for macOS, Windows, and Linux:
+
+---
+
+### **1. Install Java**  
+👉 Follow the instructions provided above under **Java (AsyncHttpClient)** for detailed steps on how to install the Java Development Kit (JDK) on macOS, Windows, or Linux.
+
+---
+
+### **2. Add the `Unirest` Library**  
+To use `Unirest` in Java, you need to add it as a dependency in your project.  
+
+#### Using **Maven**:  
+1. Add the following dependency to your `pom.xml` file:  
+   ```xml
+   <dependency>
+       <groupId>com.konghq</groupId>
+       <artifactId>unirest-java</artifactId>
+       <version>3.14.1</version>
+   </dependency>
+   ```  
+2. Save the file and run:  
+   ```bash
+   mvn install
+   ```
+
+#### Using **Gradle**:  
+1. Add the following line to the `dependencies` section in your `build.gradle` file:  
+   ```gradle
+   implementation 'com.konghq:unirest-java:3.14.1'
+   ```  
+2. Run the following command to fetch the dependency:  
+   ```bash
+   gradle build
+   ```
+
+---
+
+### **3. Run the Generated Code**  
+👉 Refer to the instructions provided above under **Java (AsyncHttpClient)** for steps to save, compile, and execute the Java code.
+
+---
 
 ## Julia (HTTP)