将一个空字符串转换为整数 [英] Cast a Null String into Integer

问题描述

有什么方法可以将null转换为整数。 null实际上是一个字符串，我传递在我的服务层，接受它作为一个整数。所以，每当我试图将一个null String转换为Integer，它会抛出一个异常。但我必须将null转换为整数。

Is there any way to cast a null to Integer. The null is actually a String, which i am passing in my service layer that accepts it as an Integer. So, whenever i try to cast a null String to Integer, it throws me an exception. But i have to cast the null into Integer.

感谢

推荐答案

>您不能将字符串转换为整数。但是，如果你试图将字符串转换为整数，如果你必须提供一个实现来处理 null Strings，看看这段代码：

You cannot cast from String to Integer. However, if you are trying to convert string into integer and if you have to provide an implementation for handling null Strings, take a look at this code snippet:

String str = "...";
// suppose str becomes null after some operation(s).
int number = 0;
try
{
    if(str != null)
      number = Integer.parseInt(str);
}
catch (NumberFormatException e)
{
    number = 0;
}

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