Module java.base
Package java.lang

Class Number

  • All Implemented Interfaces:
    Serializable
    Direct Known Subclasses:
    AtomicInteger, AtomicLong, BigDecimal, BigInteger, Byte, Double, DoubleAccumulator, DoubleAdder, Float, Integer, Long, LongAccumulator, LongAdder, Short
    public abstract class Number
extends Object
implements Serializable
    The abstract class Number is the superclass of platform classes representing numeric values that are convertible to the primitive types byte, double, float, int, long, and short. The specific semantics of the conversion from the numeric value of a particular Number implementation to a given primitive type is defined by the Number implementation in question. For platform classes, the conversion is often analogous to a narrowing primitive conversion or a widening primitive conversion as defined in The Java™ Language Specification for converting between primitive types. Therefore, conversions may lose information about the overall magnitude of a numeric value, may lose precision, and may even return a result of a different sign than the input. See the documentation of a given Number implementation for conversion details.
    Since:
    1.0
    See Also:
    Serialized Form
    See The Java™ Language Specification:
    5.1.2 Widening Primitive Conversions, 5.1.3 Narrowing Primitive Conversions

    • Constructor Summary

      Constructors 
      Constructor Description
      Number()  

    • Method Summary

      Modifier and Type Method Description
      byte byteValue()
      Returns the value of the specified number as a byte.
      abstract double doubleValue()
      Returns the value of the specified number as a double.
      abstract float floatValue()
      Returns the value of the specified number as a float.
      abstract int intValue()
      Returns the value of the specified number as an int.
      abstract long longValue()
      Returns the value of the specified number as a long.
      short shortValue()
      Returns the value of the specified number as a short.

    • Constructor Detail

      • Number

        public Number()

    • Method Detail

      • intValue

        public abstract int intValue()
        Returns the value of the specified number as an int.
        Returns:
        the numeric value represented by this object after conversion to type int.

      • longValue

        public abstract long longValue()
        Returns the value of the specified number as a long.
        Returns:
        the numeric value represented by this object after conversion to type long.

      • floatValue

        public abstract float floatValue()
        Returns the value of the specified number as a float.
        Returns:
        the numeric value represented by this object after conversion to type float.

      • doubleValue

        public abstract double doubleValue()
        Returns the value of the specified number as a double.
        Returns:
        the numeric value represented by this object after conversion to type double.

      • byteValue

        public byte byteValue()
        Returns the value of the specified number as a byte.

        This implementation returns the result of intValue() cast to a byte.

        Returns:
        the numeric value represented by this object after conversion to type byte.
        Since:
        1.1

      • shortValue

        public short shortValue()
        Returns the value of the specified number as a short.

        This implementation returns the result of intValue() cast to a short.

        Returns:
        the numeric value represented by this object after conversion to type short.
        Since:
        1.1