Double不转换为int
问题描述：
这段代码已经写入，将 double 转换为 int 获取异常。
This code I have written to convert double into int getting an exception.
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Cannot cast from Double to int
这是我的代码
Double d = 10.9;
int i = (int)(d);
答
Double 是原始 double 之上的包装器类。它可以转换为 double ，但不能直接转换为 int 。
Double is a wrapper class on top of the primitive double. It can be cast to double, but it cannot be cast to int directly.
如果您使用 double 而不是 Double ，则会编译：
If you use double instead of Double, it will compile:
double d = 10.9;
int i = (int)(d);
您还可以添加一个演员到 double 在中间，像这样：
You can also add a cast to double in the middle, like this:
int i = (int)((double)d);