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 classNumberextendsObjectimplementsSerializable
    The abstract classNumber is the superclass of platform classes representing numeric values that are convertible to the primitive typesbyte,double,float, int,long, andshort. The specific semantics of the conversion from the numeric value of a particularNumber implementation to a given primitive type is defined by theNumber implementation in question. For platform classes, the conversion is often analogous to a narrowing primitive conversion or a widening primitive conversion as defined inThe 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 givenNumber implementation for conversion details.
    Since:
    1.0
    See Also:
    Serialized Form
    SeeThe Java™ Language Specification:
    5.1.2 Widening Primitive Conversions, 5.1.3 Narrowing Primitive Conversions

    • Constructor Detail

      • Number

        public Number()

    • Method Detail

      • intValue

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

      • longValue

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

      • floatValue

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

      • doubleValue

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

      • byteValue

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

        This implementation returns the result ofintValue() cast to abyte.

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

      • shortValue

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

        This implementation returns the result ofintValue() cast to ashort.

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