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.

See Java Language Specification:

5.1.2 Widening Primitive Conversion
5.1.3 Narrowing Primitive Conversion

Since:

1.0

See Also:

Serialized Form

• Constructor Summary

  Constructors 

  Constructor	Description
  Number()	Constructor for subclasses to call.

• 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.

  Methods declared in class java.lang.Object

  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Details

  • Number

    public Number()

    Constructor for subclasses to call.

• Method Details

  • 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