Dispaly selected value from combobox of servlet program

[shrutinr]

Hi..
I m haiving problem in retrieving selected data from combobox of servlet page .
I have combobox in servlet and want to display selected value in d same page..
please help me to resolve this problem..
Here is my code:

PrintWriter pw=response.getWriter();
        pw.write("<h1>Welcome to Shopping cart</h1>");
        pw.write("<form name=myform method=post>");

        HashMap<String, Integer> add= new HashMap<String,Integer>();
        add.put("c",100);
        add.put("C++",300);
        add.put("Java",600);
        Collection c=add.values();
        Set s=add.keySet();
        Iterator i=s.iterator();
        pw.write("Product List<select name=list ><option>Select Books</option>");

            Iterator<String> ie=s.iterator();
            while(ie.hasNext())
            {
            pw.write("<option>" );
            pw.write(ie.next());
            pw.write("</option>");

            }



        pw.write("</select>");

        pw.write("<input type=submit name=submit value=Submit>");
        pw.write("</form>");


        pw.write("<hr >");

// here i need code to be added to dispaly selected values