3
您将如何使用Java的WatchEvent<T>
类?Java7/WatchEvent - 为什么它不是枚举?
我的意思是:
for (WatchEvent<?> event : key.pollEvents()) {
final WatchEvent.Kind<?> kind = event.kind();
/*
* This key is registered only for ENTRY_CREATE events,
* but an OVERFLOW event can occur regardless if events are
* lost or discarded.
*/
if (kind == OVERFLOW) {
continue;
}
// Cast is safe because we registered a path instance.
@SuppressWarnings("unchecked")
WatchEvent<Path> ev = (WatchEvent<Path>)event;
final Kind<Path> type = ev.kind();
if (type == ENTRY_CREATE) {
// Do something.
} else if (type == ENTRY_DELETE) {
// Do something.
} else if (type == ENTRY_MODIFY) {
// Do something.
}
}
似乎是有点丑(当然,二else if
语句可能还行,但是......)。
为什么他们不使用枚举来表示事件类型?
我不知道,但我确定开发者有他们的理由。投票结束这个问题.. – mre
你可以打开枚举,我没有看到它的坏事。 –