我想撰寫自己的Map課程。MapBase并MapMixin有類似的檔案。我應該使用哪一個來撰寫我自己的Map課程？為什么？
我知道MapBase有更多的功能，因為它實作了MapMixin. 但是，中的函式MapBase似乎并不重要，因為它的所有函式都是static.
...
/// A basic `Map` class can be implemented by extending this class and
/// implementing `keys`, `operator[]`, `operator[]=`, `remove` and `clear`.
/// The remaining operations are implemented in terms of these five.
...
abstract class MapBase<K, V> extends MapMixin<K, V> {
...
/// A basic `Map` class can be implemented by mixin in this class and
/// implementing `keys`, `operator[]`, `operator[]=`, `remove` and `clear`.
/// The remaining operations are implemented in terms of these five.
...
abstract class MapMixin<K, V> implements Map<K, V> {
uj5u.com熱心網友回復：
這真的不要緊。mixin 的優點是你可以在你的類中包含多個 mixin，而你只能從一個類擴展。
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