如何将对象转换为 int [英] How to cast an Object to an int
问题描述
如何在java中将对象转换为int?
How can I cast an Object to an int in java?
推荐答案
如果你确定这个对象是一个 Integer :
If you're sure that this object is an Integer :
int i = (Integer) object;
或者，从 Java 7 开始，您可以等效地编写:
Or, starting from Java 7, you can equivalently write:
int i = (int) object;
当心，它可能会抛出一个 ClassCastException 如果您的对象不是 Integer 和 NullPointerException 如果您的对象是 null.
Beware, it can throw a ClassCastException if your object isn't an Integer and a NullPointerException if your object is null.
这样你就假设你的对象是一个整数(包装的整数)，然后你把它拆箱成一个整数.
This way you assume that your Object is an Integer (the wrapped int) and you unbox it into an int.
int 是一个原语，所以它不能存储为 Object，唯一的方法是考虑/装箱一个 int作为 Integer 然后存储为 Object.
int is a primitive so it can't be stored as an Object, the only way is to have an int considered/boxed as an Integer then stored as an Object.
如果您的对象是 String，那么您可以使用 Integer.valueOf() 方法将其转换为简单的 int :
If your object is a String, then you can use the Integer.valueOf() method to convert it into a simple int :
int i = Integer.valueOf((String) object);
它可以抛出一个 NumberFormatException 如果您的对象不是真正的 String 以整数作为内容.
It can throw a NumberFormatException if your object isn't really a String with an integer as content.
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