Calendars: update

import com.google.api.services.calendar.Calendar;

// ...

// Initialize Calendar service with valid OAuth credentials
Calendar service = new Calendar.Builder(httpTransport, jsonFactory, credentials)
    .setApplicationName("applicationName").build();

// Retrieve a calendar
com.google.api.services.calendar.model.Calendar calendar =
    service.calendars().get('primary').execute();

// Make a change
calendar.setSummary("calendarSummary");

// Update the altered calendar
com.google.api.services.calendar.model.Calendar updatedCalendar =
    service.calendars().update(calendar.getId(), calendar).execute();

System.out.println(updatedCalendar.getEtag());

# First retrieve the calendar from the API.
calendar = service.calendars().get(calendarId='primary').execute()

calendar['summary'] = 'New Summary'

updated_calendar = service.calendars().update(calendarId=calendar['id'], body=calendar).execute()

print updated_calendar['etag']

// First retrieve the calendar from the API.
$calendar = $service->calendars->get('primary');

$calendar->setSummary('New Summary');

$updatedCalendar = $service->calendars->update('primary', $calendar);

echo $updatedCalendar->getEtag();

calendar = client.get_calendar('primary')
calendar.summary = "New Summary"
result = client.update_calendar(calendar.id, calendar)
print result.etag