Java: convert list of objects to something else

Question

I have a class that has a list of Events.

public class EventScheduler{

     List<Event> event

}

public class Event{

     private String text;
     private int timestamp;

}

I have an EventView, it takes an Event as a constructor and has getters and no setters.

It is basically allows subset of variables set in event to be viewed, whilst acting in a similar fashion to Event.

public class EventView{

     public EventView(Event event){
         this.event = event;
     }

     public String getText(){
         return event.getText();
     }

     //no timestamp getter as its not allowed for this view object.
}

So with this setup, what is the quickest way to convert a List<Event> to List<EventView>? Or some kind of alternative.

as answered below, you have to instantiate an object using "new". — akshayb
– akshayb, Commented Sep 10, 2014 at 11:55
You write a for-loop that iterators over the list of Events and creates en EventView object for each. With Java 8 there are alternative syntaxes than a for-loop to do the same. — Erwin Bolwidt
– Erwin Bolwidt, Commented Sep 10, 2014 at 11:55

JB Nizet · Accepted Answer · 2014-09-10 11:55:41Z

4

With Java 8:

List<EventView> views = events.stream()
                              .map(EventView::new)
                              .collect(Collectors.toList());

answered Sep 10, 2014 at 11:55

JB Nizet

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M A · Accepted Answer · 2014-09-10 11:53:12Z

3

Iterate over each Event and create an EventView for it, then pass it to a list:

List<EventView> eventViewList = new ArrayList<EventView>();
if(eventList != null) {
   for(Event event : eventList) {
       EventView eventView = new EventView(event);
       eventViewList.add(eventView);
   }
}

answered Sep 10, 2014 at 11:53

M A

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