命名参数和可选参数是两个比较简单的特性，对于熟悉其他编程语言的开发者来说可选参数并不陌生，为参数提供默认值时就是可选参数：

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类型系统提供重要的广度，在某种程度上同样迎合了安全性、描述性、动态性和本机互操作性。 首先，类型系统启用面向对象的编程模型。 它包括类型、（单基类）继承、接口（包括默认方法实现）和虚拟方法调度，为对象方向允许的所有类型分层提供合理的行为。 泛型类型 无处不在，使你能够将类专用于一个或多个类型。

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而这种原始转换（由子类转换为父类）方向相同的可变性，被称为协变（covariant）；其反向操作则被称为逆变（contravariant）。当同样的情形应用于泛型时，例如：

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