eclipse Double 不会转换为 int
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Double is not converting to an int
提问by Mayank Pratap
This code I have written to convert doubleinto intgetting an exception.
我编写的这段代码是为了转换double为int获取异常。
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Cannot cast from Double to int
This is my code
这是我的代码
Double d = 10.9;
int i = (int)(d);
回答by dasblinkenlight
Doubleis a wrapperclass on top of the primitive double. It can be cast to double, but it cannot be cast to intdirectly.
Double是基元之上的包装类double。它可以转换为double，但不能int直接转换为 。
If you use doubleinstead of Double, it will compile:
如果使用double而不是Double，它将编译：
double d = 10.9;
int i = (int)(d);
You can also add a cast to doublein the middle, like this:
您还可以double在中间添加演员表，如下所示：
int i = (int)((double)d);
回答by radai
thats because you cant mix unboxing (converting your Doubleto a double primitive) and casting.
try
那是因为你不能混合拆箱（将你的转换Double为双primitive）和铸造。尝试
int i = (int)(d.doubleValue());
回答by Sri Harsha Chilakapati
This
这个
Double d = 10.9;
is your error. You are using wrapper classes instead of data types. Use
是你的错误。您正在使用包装类而不是数据类型。用
double d = 10.9;
回答by Avinash T.
You can not cast wrapper like Double to primitive type like int directly.
您不能将像 Double 这样的包装器直接转换为像 int 这样的原始类型。
You can try this -
你可以试试这个——
int i = (int)((double)d);
int i = (int)((double)d);
For more check following link - http://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html
有关更多检查以下链接 - http://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html
