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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. In addition, this class provides several methods for converting a double to a String and a String to a double, as well as other constants and methods useful when dealing with a double. 1. double 형 숫자를 String으로 변환 String strTemp = Double.toString(1.23456..