sealed class

常见例句

双语例句

• A sealed class cannot be used as a base class.
  密封类别不能当做基底类别使用。
• Because they can never be used as a base class, some run-time optimizations can make calling sealed class members slightly faster.
  由于密封类从不用作基类，所以有些运行时优化可以使对密封类成员的调用略快。
• 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.
  我们会在《第7章 - Scala 对象系统》的“完成类（sealed class）结构”讨论完成类的结构时学习到其中一种技术。

权威例句

• 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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