我无法在Java中创建通用数组类型的原因是什么? [英] What's the reason I can't create generic array types in Java?
问题描述
Java不允许我们执行的原因是什么?
What's the reason Java doesn't allow us to do
private T[] elements = new T[initialCapacity];
我可以理解.NET不允许我们这样做,因为在.NET中您有价值类型在运行时可以有不同的大小,但在Java中,所有类型的T都将是对象引用,因此具有相同的大小(如果我错了,请纠正我)。
I could understand .NET didn't allow us to do that, as in .NET you have value types that at run-time can have different sizes, but in Java all kinds of T will be object references, thus having the same size (correct me if I'm wrong).
原因是什么?
推荐答案
这是因为Java的数组(不同于泛型)在运行时包含有关其组件类型。所以当你创建数组时,你必须知道组件的类型。由于您不知道 T
在运行时,您无法创建数组。
It's because Java's arrays (unlike generics) contain, at runtime, information about its component type. So you must know the component type when you create the array. Since you don't know what T
is at runtime, you can't create the array.
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