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Java Standard Edition (SE)

Number


compact1, compact2, compact3
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 defining 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:
    JDK1.0
    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 and Description
      Number() 
    • Method Summary

      All Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method and Description
      byte byteValue()
      Returns the value of the specified number as a byte, which may involve rounding or truncation.
      abstract double doubleValue()
      Returns the value of the specified number as a double, which may involve rounding.
      abstract float floatValue()
      Returns the value of the specified number as a float, which may involve rounding.
      abstract int intValue()
      Returns the value of the specified number as an int, which may involve rounding or truncation.
      abstract long longValue()
      Returns the value of the specified number as a long, which may involve rounding or truncation.
      short shortValue()
      Returns the value of the specified number as a short, which may involve rounding or truncation.
    • Constructor Detail

      • Number

        public Number()
    • Method Detail

      • intValue

        public abstract int intValue()
        Returns the value of the specified number as an int, which may involve rounding or truncation.
        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, which may involve rounding or truncation.
        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, which may involve rounding.
        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, which may involve rounding.
        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, which may involve rounding or truncation.

        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:
        JDK1.1
      • shortValue

        public short shortValue()
        Returns the value of the specified number as a short, which may involve rounding or truncation.

        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:
        JDK1.1


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