使用流收集HashMap中的事件

HashMap<String, Event> eventMap = new HashMap<>();

Event event1 = new Event("1", "Event 1");
Event event2 = new Event("2", "Event 2");

eventMap.put(event1.getId(), event1);
eventMap.put(event2.getId(), event2);

List<Event> collectedEvents = eventMap.values().stream().collect(Collectors.toList());

// 对事件按照名称进行排序
List<Event> sortedEvents = collectedEvents.stream()
    .sorted(Comparator.comparing(Event::getName))
    .collect(Collectors.toList());

// 过滤出名称包含"Event"的事件
List<Event> filteredEvents = collectedEvents.stream()
    .filter(event -> event.getName().contains("Event"))
    .collect(Collectors.toList());

// 对事件名称进行映射，获取事件名称列表
List<String> eventNames = collectedEvents.stream()
    .map(Event::getName)
    .collect(Collectors.toList());