關於 Unchecked cast from Iterator to Iterator String 提示

爲何80%的碼農都作不了架構師？>>>   java 遇到個這個提示：Unchecked cast from Iterator to Iterator String架構 Iterator<String> keys = data.keys();Iterator<String> keys = data.keys(); 修改成： Iterator<?> keys = data.keys(); Strin

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