泛型中的数组类型 [英] Array type in generics

问题描述

我正在尝试创建一个泛型数组.我收到错误:

I am trying to create an array of generic type. I am getting error:

 Pair<String, String>[] pairs;   // no error here

 pairs = new Pair<String, String>[10];   // compile error here

 void method (Pair<String, String>[] pairs)  // no error here.

我很困惑.为什么会发生这种情况的任何线索.

I am confused. Any clues why this is happening.

推荐答案

这背后的原因是你不能创建泛型或参数化类型的数组，只能创建 reifiable 类型(即可以在运行时推导).

The reason behind this is that you can't create arrays of generic or parameterized types, only reifiable types (i.e. types which can be deduced at runtime).

虽然可以声明这样的数组类型作为变量或方法参数.这有点不合逻辑，但 Java 现在就是这样.

It is possible though to declare such array types as variables or method parameters. This is a bit illogical, but that's how Java is now.

Java 泛型和集合在第 6 章中广泛讨论了这个问题和相关问题.

Java Generics and Collections deals with this and related issues extensively in chapter 6.

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