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如何安装 Java EE SDK？

我正在介绍有关 servlet 的大学章节。这本书要求我复制一段代码并在cmd中运行它。它不会在 cmd 中运行，并且这一章模糊地解释了我如何安装 Java EE。这是代码和错误：

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class NameServlet extends HttpServlet {
    
    public static void main(String[] args) {

    }

    public void doGet(HttpServletRequest request, HttpServletResponse response) 
            throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        out.println("<html>");
        out.println("<body style=’background-color: lightyellow’>");

        String name = "Wow, this servlet works great!!";
        out.println("Name: " + name);
        out.println("</body>");
        out.println("</html>");
        out.close();
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) 
            throws ServletException, IOException {
        doGet(request, response);
    }
}

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错误：