Class Number

java.lang.Object
java.lang.Number
All Implemented Interfaces:
Serializable
Direct Known Subclasses:
AtomicInteger, AtomicLong, BigDecimal, BigInteger, Byte, Double, DoubleAccumulator, DoubleAdder, Float, Float16, 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:

  • 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 Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
    boolean
    equals(Object o)
    Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    May cause performance issues, deadlocks and hangs.
    final Class<? extends Object>
    getClass()
    Answers the unique instance of java.lang.Class which represents the class of the receiver.
    int
    hashCode()
    Answers an integer hash code for the receiver.
    final void
    notify()
    Causes one thread which is waiting on the receiver to be made ready to run.
    final void
    notifyAll()
    Causes all threads which are waiting on the receiver to be made ready to run.
    String
    toString()
    Answers a string containing a concise, human-readable description of the receiver.
    final void
    wait()
    Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
    final void
    wait(long time)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final void
    wait(long time, int frac)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

  • 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