Definition of double in the Idioms Dictionary. double phrase. What does double expression mean? Definitions by the largest Idiom Dictionary. Double - Idioms by The
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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." link. As @Fess mentioned and because Double is reference type it can be null. If you want you can explictly convert from Double to double with .doubleValue() method and viceverrsa with new Double(1.0).