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Explanation

ServletConfig provides configuration information specific to a particular servlet.

Code:

ServletConfig config = getServletConfig();
String value = config.getInitParameter("adminEmail");

Explanation

Servlet initialization parameters can be defined using the @WebServlet annotation.

Code:

@WebServlet(
    value = "/admin",
    initParams = {
        @WebInitParam(
            name = "adminEmail",
            value = "admin@example.com"
        )
    }
)

Explanation

ServletContext represents the entire web application and can be shared by multiple servlets.

Code:

ServletContext context =
    getServletContext();

Explanation

ServletContext can store application-wide attributes accessible to multiple servlets.

Code:

ServletContext context =
    getServletContext();

context.setAttribute("appName", "Employee Portal");

Explanation

ServletConfig is servlet-specific, while ServletContext is shared across the complete web application.

Code:

ServletConfig
     ↓
One Servlet

ServletContext
     ↓
Entire Web Application
     ↓
Servlet 1 + Servlet 2 + Servlet 3