Integer.valueOf()与Integer.parseInt() [英] Integer.valueOf() vs. Integer.parseInt()
问题描述
除了 Integer.parseInt()
处理减号(如文件所述), Integer.valueOf()<之间是否存在任何其他差异/ code>和
Integer.parseInt()
?
Aside from Integer.parseInt()
handling the minus sign (as documented), are there any other differences between Integer.valueOf()
and Integer.parseInt()
?
因为两者都不能解析,
作为 decimal 千位分隔符(产生 NumberFormatException
),是否有一个已经可用的Java方法来做?
And since neither can parse ,
as a decimal thousands separator (produces NumberFormatException
), is there an already available Java method to do that?
推荐答案
实际上, valueOf
使用 parseInt
内部。差别是 parseInt
返回 int
原语,而 valueOf
返回一个整数
对象。从Integer.class源代码考虑:
Actually, valueOf
uses parseInt
internally. The difference is parseInt
returns an int
primitive while valueOf
returns an Integer
object. Consider from the Integer.class source:
public static int parseInt(String s) throws NumberFormatException {
return parseInt(s, 10);
}
public static Integer valueOf(String s, int radix) throws NumberFormatException {
return Integer.valueOf(parseInt(s, radix));
}
public static Integer valueOf(String s) throws NumberFormatException {
return Integer.valueOf(parseInt(s, 10));
}
至于用逗号解析,我不熟悉。我会对它们进行消毒。
As for parsing with a comma, I'm not familiar with one. I would sanitize them.
int million = Integer.parseInt("1,000,000".replace(",", ""));
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