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Asked: 2026-05-25T03:15:24+00:00

In my project, the external API we used is not genericfied, so there’s a

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In my project, the external API we used is not genericfied, so there’s a class called ItemList which is an implementation of java.util.List, it holds a list of Item objects. however in our new code we express this as List<Item>, I want to write a method that can takes both ItemList and List<Item>,
I tried this kind of signature:

public static void readList(List<?> list) {}

it works fine, but the problem is there is a cast from Object to Item inside this method, which is used when the argument is ItemList, and not necessary for List<Item>, is there a better way to do this?

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1 Answer

  1. Editorial Team

    If ItemList is an implementation of List, and if you know it contains Item instances, just cast it to List<Item>. You’ll get a type safety warning, but it’s not less safe than casting each element of the ItemList to Item.

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