返回NULL的替代方法 [英] Alternatives to returning NULL

问题描述

   /**
     * Returns the foo with the matching id in this list
     * 
     * @param id the id of the foo to return
     * @return the foo with the matching id in this list
     */
    public Foo getFoo(int id)
    {
        for (Foo foo : list)
        {
            if (foo.getID() == id)
            {
                return foo;
            }
        }

        return null;
    }

而不是返回 null 当没有找到 foo 时，我应该 throw 一个异常？是否有关于这个问题的最佳实践成语？顺便说一句，我知道我的例子有点设计，但我希望你得到这个想法...

Instead of returning null when foo is not found, should I throw an exception? Does it matter, and is there a "best practices" idiom on the subject? By the way, I know my example is a bit contrived, but I hope you get the idea...

谢谢。

编辑

根据更改代码以获取 Foo > id ，以更好地说明现实世界的情况。

Changed code to get Foo based on id to better illustrate a real-world scenario.

推荐答案

返回 null 不仅处理更简单，效果更好。必须使用例外处理例外案例。

Returning null is not only more simple to handle, performs better too. The exceptions must be used to handle exceptional cases.

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