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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Number.html below:

Number (Java SE 21 & JDK 21)

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

AtomicInteger, AtomicLong, BigDecimal, BigInteger, Byte, Double, DoubleAccumulator, DoubleAdder, Float, Integer, Long, LongAccumulator, LongAdder, Short

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 for subclasses to call.

• Method Summary

  byte

  Returns the value of the specified number as a byte.

  abstract double

  Returns the value of the specified number as a double.

  abstract float

  Returns the value of the specified number as a float.

  abstract int

  Returns the value of the specified number as an int.

  abstract long

  Returns the value of the specified number as a long.

  short

  Returns the value of the specified number as a short.

  Methods declared in class java.lang.Objectclone, 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.

    Implementation Requirements:

    The default 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.

    Implementation Requirements:

    The default 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

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