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                Java的多態分為編譯時多態和運行時多態兩種; 編譯時多態主要指方法的重載; 運行時多態指程序中定義的對象引用所指向的具體類型在運行期間才確定 ### 運行時多態 運行時多態指程序中定義的對象引用所指向的具體類型在運行期間才確定; 運行時多態有三個條件: 1. 繼承 2. 方法重寫 3. 向上轉型
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