OnChange - Access java Array to set hidden input (nebbie)

Category : Java
I am new to web development and I am trying to get the Patient Id (patid) from the selected name from the list. Can this be done like this? out.println("<select name="patientName" onChange="patid=resident.get(this.selectedIndex).getPatId();" >");
If not, can you make a suggestion to how I would do this.
<% try {

ArrayList<Patient> residents = service.getPatientList(loginInfo.getUserid());
String selectedPatient = request.getParameter("selectedPatient");
int index = 0;
//<select onchange="location = this.options[this.selectedIndex].value;"><

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