Java “双”与“双”的区别
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Difference between "Double" and "double"
提问by Ashwin Shirva
What is the difference between Doubleand double?
Double和 和有double什么区别？
采纳答案by But I'm Not A Wrapper Class
Doubleis an object and doubleis a primitive data type. See this answer for more details.
Double是一个对象并且double是一种原始数据类型。 有关更多详细信息，请参阅此答案。
The Double class wraps a value of the primitive type double in an object. An object of type Double contains a single field whose type is double.
Double 类将原始类型 double 的值包装在一个对象中。Double 类型的对象包含一个类型为 double 的字段。
Source: http://docs.oracle.com/javase/7/docs/api/java/lang/Double.html
来源：http: //docs.oracle.com/javase/7/docs/api/java/lang/Double.html
