Number (Java Platform SE 7 ) - Oracle
https://docs.oracle.com/javase/7/docs/api/java/lang/Number.html
The abstract class Number is the superclass of classes BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, and Short.. Subclasses of Number must provide methods to convert the represented numeric value to byte, double, float, int, long, and short.
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