摘要：The beginning of this chapter introduced the idea of writing code that can be applied as generally as possible. To do this, we need ways to loosen the... 阅读全文

摘要：​Ordinaryclassesandmethodsworkwithspecifictypes: eitherprimitivesorclasstypes.Ifyouarewritingcodethatmightbeusedacrossmoretypes,thisrigiditycanbeoverconstraining.One way that object-oriented languages allow generalization is through polymorphism. You can write (for example) a method that takes a bas 阅读全文