Hello Expert, I have a method on which I'm running loop for showing all records of particular user(account). I'm getting index number in result. I want to show id of user instead of index number.
 

public static void methodEventData2(){
    try {

        Map<id,list<event>> UserEvent2 = new Map<id,list<event>>();
        List<event> tempEventList = null;

        List<Event> newEvents = [Select Id, Subject, WhatId, WhoId, Who.Name, EndDate, EndDateTime,Start_Date_Time__c, OwnerId, 
            ActivityDate, ActivityDateTime, Facilities__c,Facilities__r.Name, Services__c, Appointment_Status__c, Description, 
            DC_Session_End_Time__c,DC_Session_Last_Start_Time__c,DC_Session_Run_Time__c,DC_Session_Start_Time__c,
            DC_Session_Status__c, End_Time__c, IsRecurrence, Sup_Provider__c, DOSSession__c, What.Name,Owner.Name From Event WHERE 
             whoid != null order by OwnerId limit 200];

            
            for(event et : newEvents){
            if(!UserEvent2.isEmpty() || UserEvent2 !=null){
                if(UserEvent2.get(et.OwnerId) != null){
                    tempEventList.add(et);
                    UserEvent2.put(et.OwnerId, tempEventList);
                }
                else{
                    tempEventList = new List<event>();
                    tempEventList.add(et);
                    UserEvent2.put(et.OwnerId, tempEventList);
                }
            }
         }



        Set<Id> keySet = UserEvent2.keySet();



        String body='{';
        Http http = new Http();
        HttpRequest request = new HttpRequest();
        request.setEndpoint('https://test/Appointments.json');
        request.setMethod('PATCH');
        
        for(id ownerId : keySet)
        {
            body=body+'"'+Ownerid+'" :'+JSON.serialize(UserEvent2.get(ownerId))+',';
        }
        body=body.removeEnd(',');
        body=body+'}';
        request.setBody(body);
        HttpResponse response = http.send(request);
}

when I'm writing tempEventList.add(et.OwnerId), it's showing error. Can anyone please guide as to how I can print ownerId in result instead of index number (0,1,2..). Please help