**Setting up the Java Development Environment and Creating a Java Project in Eclipse Step by Step**
The main focus here is how to configure the Java development environment on a Windows system.
1. **First, Install the JDK**
Java Development Kit (JDK) is essential for developing Java applications. Go to the official Oracle website to download the latest version of JDK. For example: [https://www.oracle.com/java/technologies/downloads/](https://www.oracle.com/java/technologies/downloads/).
Once downloaded, run the `.exe` file and follow the installation wizard. The default installation path is usually `C:\Program Files\Java\jdk-`.
2. **Configure Environment Variables**
After installing the JDK, you need to set up environment variables so that your system can recognize Java commands.
- On **Windows XP**, right-click "My Computer" > Properties > Advanced.
- On **Windows 7 or later**, right-click "Computer" > Properties > Advanced System Settings > Environment Variables.
In the Environment Variables window, you should create or modify three variables: `JAVA_HOME`, `PATH`, and `CLASSPATH`.
- **JAVA_HOME**: Set this to the JDK installation directory, e.g., `C:\Program Files\Java\jdk-1.8.0_101`.
- **CLASSPATH**: Add `.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;` to include necessary libraries.
- **PATH**: Append `%JAVA_HOME%\bin` to the existing PATH variable to allow running Java commands from any location.
3. **Test the Configuration**
Open Command Prompt and type `java -version`. If the installation and configuration are correct, you will see the Java version details displayed.
**Second, Create a Java Project Using Eclipse**
1. **Download Eclipse**
Visit the official Eclipse website at [https://www.eclipse.org/downloads/](https://www.eclipse.org/downloads/) and download the appropriate version for Java development, such as Eclipse IDE for Java Developers.
2. **Extract and Launch Eclipse**
Unzip the downloaded file and run `eclipse.exe`. You will be prompted to choose a workspace. Select a directory, such as `D:\workspace`, and click OK.
3. **Create a New Java Project**
- In the Eclipse workbench, go to File > New > Java Project.
- Enter a project name, select the JRE version, and click Finish.
- A new project will appear in the Project Explorer.
4. **Create a Package and Class**
- Right-click on the `src` folder > New > Package.
- Enter a package name (e.g., `com.example.helloworld`) and click Finish.
- Right-click the newly created package > New > Class.
- Enter a class name (e.g., `HelloWorld`) and check the box for `public static void main(String[] args)` to generate the main method automatically.
5. **Write and Run the Code**
Open the class file and add the following code:
```java
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World by http://example.com");
}
}
```
6. **Run the Program**
Click Run > Run (or press `Ctrl + F11`). The output will be displayed in the Console view. You should see `Hello World by http://example.com` printed.
This step-by-step guide ensures that you have a fully functional Java development environment and can start building Java projects using Eclipse.
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