JNumberSpinner 
  fun <T : Number, Comparable<T>> JNumberSpinner(    value: T,     minValue: T,     maxValue: T,     stepSize: T,     description: String? = null)
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Parameters
T
the type of number
value
the default value
minValue 
the smallest number that may be represented
maxValue 
the largest number that may be represented
stepSize 
the default value to increment and decrement by
description
the description to use in error messages; defaults to DEFAULT_DESCRIPTION if null is given