sealed class

常见例句

雙語例句

• A sealed class cannot be used as a base class.
  密封類別不能儅做基底類別使用。
• Because they can never be used as a base class, some run-time optimizations can make calling sealed class members slightly faster.
  由於密封類從不用作基類，所以有些運行時優化可以使對密封類成員的調用略快。
• We’ll learn one technique that helps when we discuss sealed class hierarchies in the section called “Sealed Class Hierarchies” in Chapter 7, The Scala Object System.
  我們會在《第7章 - Scala 對象系統》的“完成類（sealed class）結搆”討論完成類的結搆時學習到其中一種技術。

權威例句

• In the end it was the halving of premium travel (supersonic, first class and business class) thanks to economic slow-down, terrorism and the Iraq war that sealed its fate.
  ECONOMIST: Air travel: After Concorde The
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