Duvida de iniciante (O que falta fazer para que eu consiga executar o formulario)

package edu.formulario.calculadora;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class Calcular3 extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
	PrintWriter writer = response.getWriter();
	writer.print("<html>");
	writer.print("<head>");
	writer.print("  <title>Cadastro</title>");
	writer.print("</head>");
	writer.print("<body>");
	writer.print("    <form name='form_nome' action='calculadora' method='post'>");
	writer.print("      <table border='0'>");
	writer.print("        <tr>");
	writer.print("          <td colspan='2'align='center'>Calculadora</td>");
	writer.print("        </tr>");
	writer.print("        <tr>");
	writer.print("          <td align='right'>Valor 1: </td>");
	writer.print("          <td><input type='text' name='val_1' /></td>");
	writer.print("        </tr>");
	writer.print("        <tr>");
	writer.print("        <tr>");
	writer.print("          <td align='right'>Valor 2</td>");
	writer.print("          <td><input type='text' name='val_2' /></td>");
	writer.print("        </tr>");
	writer.print("        <tr>");		
	writer.print("          <td align='right'>Operação:</td>");
	writer.print("          <td><select name='operacao'>");
	writer.print("               <option value='+'>Soma</option>");
	writer.print("               <option value='-'>Subtrai</option>");
	writer.print("               <option value='*'>Multiplica</option>");
	writer.print("               <option value='/'>Divide</option>");
	writer.print("             </select>");
	writer.print("          </td>");
	writer.print("        </tr>");
	writer.print("        <tr>");
	writer.print("          <td align='center'></td>");
	writer.print("          <td align='center'><input type='submit' name='sub_ok' value='Ok' /><input type='submit' name='sub_limpa' value='Limpar'></td>");
	writer.print("        </tr>");
	writer.print("      </table>");
	writer.print("    </form>");
	writer.print("<a href='/DinanicForms/calculadora?operacao=Somar+'> + | </a>");		
	writer.print("<a href='/DinanicForms/calculadora?operacao=Diminuir'> - | </a>");
	writer.print("<a href='/DinanicForms/calculadora?operacao=Multiplicar'> * | </a>");
	writer.print("<a href='/DinanicForms/calculadora?operacao=Dividir'> / | </a>");		
	writer.print("</body>");
	writer.print("</html>");
}	

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	PrintWriter writer = response.getWriter();
	String operacao = request.getParameter("operacao");
	String val_1 = request.getParameter("val_1");
	String val_2 = request.getParameter("val_2");
	//String result = "";
	int val1 = Integer.parseInt(val_1);
	int val2 = Integer.parseInt(val_2);
	double result = 0;
	
	writer.print("<html>");
	writer.print("<head>");
	writer.print("  <title>Mostra</title>");
	writer.print("</head>");
	writer.print("<body>");
	
	if(operacao.equals("+"))
	{
		result = (val1 + val2); 
	}
	else if(operacao.equals("-"))
	{
		result = (val1 - val2); 
	}
	else if(operacao.equals("*"))
	{
		result = (val1 * val2); 
	}
	else if(operacao.equals("/"))
	{
		result = (val1 / val2); 
	}
	
	writer.print("Resultado: "+operacao+" "+ result);
	writer.print("<br / >");
	writer.print("<hr/>");
	writer.print("<a href='/DinanicForms/calculadora'>Voltar</a>");
	writer.print("</body>");
	writer.print("</html>");
}


public static void main(String Args [])  throws ServletException, IOException 
   {
	  
	     
       
   }

}

(O que falta fazer para que eu consiga executar o formulario)

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