在没有泛型的情况下使用遗留代码时如何避免Eclipse警告？

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问题描述

我使用从Java生成JSON输出。但是每次我调用jsonobj.put（this，that），我都会在Eclipse中看到一个警告：
$ b

The clean fix would be if JSONObject were genericized, but since it isn't, I can't add any generic type parameters to fix this. I'd like to switch off as few warnings as possible, so adding "@SuppressWarnings("unchecked")" to lots of methods is unappealing, but do I have any other option besides putting up with the warnings?

解决方案

Here's one option. It's a bit ugly, but allows you to scope the the suppressed warning to only that individual operation.

Add a function which does the unchecked cast, and suppress warnings on it:

@SuppressWarnings("unchecked")
private final static Map<Object,Object> asMap(JSONObject j)
{
  return j;
}

Then you can call it without compiler warnings:

asMap(jsonobj).put("this", "that");

This way, you can be sure that you aren't suppressing any warnings that you actually want to see.

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