Stay organized with collections
Save and categorize content based on your preferences.
Number
abstract class Number : 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.
Summary
| Public constructors |
|
Constructor for subclasses to call.
|
| Public methods |
| open 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.
|
| open Short |
Returns the value of the specified number as a short.
|
Public constructors
Number
Number()
Constructor for subclasses to call.
Public methods
byteValue
open fun byteValue(): Byte
Returns the value of the specified number as a byte.
| Return |
Byte |
the numeric value represented by this object after conversion to type byte. |
doubleValue
abstract fun doubleValue(): Double
Returns the value of the specified number as a double.
| Return |
Double |
the numeric value represented by this object after conversion to type double. |
floatValue
abstract fun floatValue(): Float
Returns the value of the specified number as a float.
| Return |
Float |
the numeric value represented by this object after conversion to type float. |
intValue
abstract fun intValue(): Int
Returns the value of the specified number as an int.
| Return |
Int |
the numeric value represented by this object after conversion to type int. |
longValue
abstract fun longValue(): Long
Returns the value of the specified number as a long.
| Return |
Long |
the numeric value represented by this object after conversion to type long. |
shortValue
open fun shortValue(): Short
Returns the value of the specified number as a short.
| Return |
Short |
the numeric value represented by this object after conversion to type short. |
Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
Last updated 2025-02-10 UTC.
[null,null,["Last updated 2025-02-10 UTC."],[],[],null,["# Number\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)\n\nNumber\n======\n\n```\nabstract class Number : Serializable\n```\n\n|---|-----------------------|\n| [kotlin.Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html) ||\n| ↳ | [java.lang.Number](#) |\n\nThe 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.\n\nSummary\n-------\n\n| Public constructors ||\n|-------------------------------------------------------------|---|\n| [Number](#Number())`()` Constructor for subclasses to call. |\n\n| Public methods ||\n|-------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------|\n| open [Byte](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte/index.html) | [byteValue](#byteValue())`()` Returns the value of the specified number as a `byte`. |\n| abstract [Double](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-double/index.html) | [doubleValue](#doubleValue())`()` Returns the value of the specified number as a `double`. |\n| abstract [Float](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-float/index.html) | [floatValue](#floatValue())`()` Returns the value of the specified number as a `float`. |\n| abstract [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [intValue](#intValue())`()` Returns the value of the specified number as an `int`. |\n| abstract [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html) | [longValue](#longValue())`()` Returns the value of the specified number as a `long`. |\n| open [Short](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-short/index.html) | [shortValue](#shortValue())`()` Returns the value of the specified number as a `short`. |\n\nPublic constructors\n-------------------\n\n### Number\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nNumber()\n```\n\nConstructor for subclasses to call.\n\nPublic methods\n--------------\n\n### byteValue\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nopen fun byteValue(): Byte\n```\n\nReturns the value of the specified number as a `byte`.\n\n| Return ||\n|------------------------------------------------------------------------------|-------------------------------------------------------------------------------|\n| [Byte](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte/index.html) | the numeric value represented by this object after conversion to type `byte`. |\n\n### doubleValue\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nabstract fun doubleValue(): Double\n```\n\nReturns the value of the specified number as a `double`.\n\n| Return ||\n|----------------------------------------------------------------------------------|---------------------------------------------------------------------------------|\n| [Double](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-double/index.html) | the numeric value represented by this object after conversion to type `double`. |\n\n### floatValue\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nabstract fun floatValue(): Float\n```\n\nReturns the value of the specified number as a `float`.\n\n| Return ||\n|--------------------------------------------------------------------------------|--------------------------------------------------------------------------------|\n| [Float](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-float/index.html) | the numeric value represented by this object after conversion to type `float`. |\n\n### intValue\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nabstract fun intValue(): Int\n```\n\nReturns the value of the specified number as an `int`.\n\n| Return ||\n|----------------------------------------------------------------------------|------------------------------------------------------------------------------|\n| [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | the numeric value represented by this object after conversion to type `int`. |\n\n### longValue\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nabstract fun longValue(): Long\n```\n\nReturns the value of the specified number as a `long`.\n\n| Return ||\n|------------------------------------------------------------------------------|-------------------------------------------------------------------------------|\n| [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html) | the numeric value represented by this object after conversion to type `long`. |\n\n### shortValue\n\nAdded in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nopen fun shortValue(): Short\n```\n\nReturns the value of the specified number as a `short`.\n\n| Return ||\n|--------------------------------------------------------------------------------|--------------------------------------------------------------------------------|\n| [Short](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-short/index.html) | the numeric value represented by this object after conversion to type `short`. |"]]
