Character.getNumericValue() 问题
我可能遗漏了什么,但为什么这两个数值等于 -1
?
I'm probably missing something, but why are the two numeric values equal to -1
?
System.out.println(Character.getNumericValue(Character.MAX_VALUE));
System.out.println(Character.getNumericValue(Character.MIN_VALUE));
返回:
-1
-1
推荐答案
getNumericValue()
将转换实际表示数字的字符(如正常"数字 0-9,但也包括其他数字脚本)到它们的数值.Character.MAX_VALUE
和Character.MIN_VALUE
所代表的Characters没有这样的数值;它们不是数字.并根据 API 文档一个>:
getNumericValue()
will convert characters that actually represent numbers (like the "normal" digits 0-9, but also numerals in other scripts) to their numeric value. The Characters represented by Character.MAX_VALUE
and Character.MIN_VALUE
do not have such a numeric value; they are not numerals. And according to the API doc:
如果角色没有数值,则返回-1.
If the character does not have a numeric value, then -1 is returned.
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