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                ## 自定義 toString() 方法 應該總是成功調用且不要拋異常. 可自定義 `toString()` 方法, 但確保你的實現方法滿足: (1) 總是成功 (2) 沒有其他負面影響. 如果不滿足這兩個條件, 那么可能會導致嚴重的問題, 比如, 如果 `toString()` 調用了包含 `assert` 的函數, `assert` 輸出導致失敗的對象, 這在 `toString()` 也會被調用.
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