为什么不在运行时指定Java通用类型参数？ [英] Why aren't Java generic type parameters reified at runtime?

问题描述

我的理解是，C＃和java在某些方面与泛型有所不同，其中之一是通用类型参数在运行时在C＃/ .NET中可用，但在Java中不可用。为什么Java语言设计人员这样做？

解决方案

允许新代码与旧代码进行交互。 b
$ b

从类型擦除

$ b

类型擦除使Java应用程序
能够使用泛型来维护二进制
与在
泛型之前创建的Java库和
应用程序的兼容性。

[...]

类型擦除存在，因此新代码
可能会继续与传统
代码接口。

有关相关问题，请查看 C＃vs Java泛型。

My understanding is that C# and java differ with respect to generics in some ways, one of which is that generic type parameters are available at runtime in C#/.NET but not in Java. Why did the Java language designers do it this way?

解决方案

To allow binary compatibility with pre-generics bytecode, therefore allowing new code to interface with old code.

From the Type Erasure page of The Java Tutorials:

Type erasure enables Java applications that use generics to maintain binary compatibility with Java libraries and applications that were created before generics.

[...]

Type erasure exists so that new code may continue to interface with legacy code.

For a related question, take a look at C# vs Java generics.

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