Java中ClassCastException的解释 [英] Explanation of ClassCastException in Java

问题描述

我阅读了一些关于ClassCastException"的文章，但我无法很好地理解它的含义.什么是 ClassCastException?

I read some articles written on "ClassCastException", but I couldn't get a good idea on what it means. What is a ClassCastException?

推荐答案

直接来自 ClassCastException:

抛出表示代码有试图将对象强制转换为它不是它的子类实例.

Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.

因此，例如，当尝试将 Integer 转换为 String 时，String 不是 Integer 的子类，所以会抛出一个 ClassCastException.

So, for example, when one tries to cast an Integer to a String, String is not an subclass of Integer, so a ClassCastException will be thrown.

Object i = Integer.valueOf(42);
String s = (String)i;            // ClassCastException thrown here.

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