将Object转换为原始int [英] Convert Object into primitive int

问题描述

如何将对象（非字符串）（如TreeNode.item）转换为类似int的原语。

How to Convert an Object(not String),like TreeNode.item, into primitive like int.

推荐答案

作为回应你的最后评论：只需仔细检查，该对象实际上是Integer类型，然后使用自动装箱（我假设您的编译器级别为1.5 +）：

In response to your last comment: just double-check, that the object is really of type Integer, then use auto-boxing (I assume that your compiler level is 1.5+):

Object o = getTheValue();
int result = 0; // we have to initialize it here!
if (o instanceof Integer) {
  result = (Integer) o;
} else {
  throw new WTFThisShouldHaveBeenIntegerException();
}

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