对象是否存在本机类型安全包装和拆箱？(Is there native type-safe wrapping and unboxing for Object?)

 我的查询是关于包装，使用Object类作为我的包装器。 
 
 我的目标是获取原始int（或int的包装）并从通用Object中取消它。 
 
 唯一的问题是我将在运行时使用混合类型，因此我无法一般地键入方法的返回类型。 T var1！=（T）var2 
 
 我现在可以做的是有过多的开销，因为我不能假设Object包含int类型的值，所以我解析它。 
 
Object int_wrapped_in_object = 1;

Integer.valueOf(String.valueOf(int_wrapped_in_object));

//I could cast from Object to int with:
//(int) int_wrapped_in_object
//but this will always anticipate a classcastexception in case the value was wrapped with another type, like String
 
 这是有效的，但我最好跳过解析步骤，只需打开整数值框。 
 
 整数包装类不支持valueOf（Object o） ，可能是因为Object没有实现相对强制转换。 它（Object）支持toString（） 。 但不是toInt（）。 它非常奇特，因为Object确实可以包装一个原始int。 为什么会出现这种情况超出我的知识水平，所以我只能使用我的工作。 据我所知，甚至可能有原生支持将Object作为int展开。 
 
 请帮助我找到一个解决方案，该解决方案涉及使用最少的解析并引入尽可能少的异常来获取原始int值。 

My inquiry is on wrapping, using the Object class as my wrapper.
 
My goal is to take the primitive int (or a wrapper of int) and unbox it from a generic Object.
 
The only problem is that I will be working with mixed types at runtime, so I am unable to generically type the return type of the method. T var1 != (T) var2
 
What I can do right now has excessive overhead because I cannot assume the Object wraps a value of type int, so I parse it.
 
Object int_wrapped_in_object = 1;

Integer.valueOf(String.valueOf(int_wrapped_in_object));

//I could cast from Object to int with:
//(int) int_wrapped_in_object
//but this will always anticipate a classcastexception in case the value was wrapped with another type, like String
 
This works, but I would ideally like to skip a step of parsing and just unwrap box for the integer value.
 
Integer wrapper class does not support valueOf(Object o), likely because Object does not implement the relative cast. It (Object) supports toString(). But not toInt(). It is very peculiar because Object indeed can wrap a primitive int. Why that is the case is above my level of knowledge, so I can only work with what I have. For all I know there may even be native support for unwrapping an Object as an int.
 
Please help me find a solution that involves using minimal parsing and introducing as few exceptions to get the primitive int value.

原文：https://stackoverflow.com/questions/45699699