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                ### [類型提升](https://lingcoder.gitee.io/onjava8/#/book/04-Operators?id=%e7%b1%bb%e5%9e%8b%e6%8f%90%e5%8d%87) 你會發現,如果我們對小于**int**的基本數據類型(即**char**、**byte**或**short**)執行任何算術或按位操作,這些值會在執行操作之前類型提升為**int**,并且結果值的類型為**int**。若想重新使用較小的類型,必須使用強制轉換(由于重新分配回一個較小的類型,結果可能會丟失精度)。通常,表達式中最大的數據類型是決定表達式結果的數據類型。**float**型和**double**型相乘,結果是**double**型的;**int**和**long**相加,結果是**long**型。
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