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                # Checked 異常與 Runtime 異常 - Runtime exceptions 是 runtime 階段碰到的異常. 在編譯的時候不需要檢查 (checked). 例如,數組腳本越界(ArrayIndexOutOfBoundsException) ,空指針異常(NullPointerException),類轉換異常(ClassCastException). - Checked exception 是在編譯階段的異常,并且強制檢查. 編譯器**強制 checked 異常必須try..catch處理或用throws聲明**繼續拋給上層調用方法處理,這就是為什么叫**checked異常**,而 Runtime 異常可以處理也可以不處理,所以,編譯器不強制用try..catch處理或用throws聲明,所以 Runtime 異常也稱為unchecked異常
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