Added in API level 1

Number

public abstract class Number
extends Object implements Serializable

java.lang.Object
   ↳ java.lang.Number


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

Number()

Constructor for subclasses to call.

Public methods

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.

Inherited methods

Public constructors

Number

Added in API level 1
public Number ()

Constructor for subclasses to call.

Public methods

byteValue

Added in API level 1
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
byte the numeric value represented by this object after conversion to type byte.

doubleValue

Added in API level 1
public abstract double doubleValue ()

Returns the value of the specified number as a double.

Returns
double the numeric value represented by this object after conversion to type double.

floatValue

Added in API level 1
public abstract float floatValue ()

Returns the value of the specified number as a float.

Returns
float the numeric value represented by this object after conversion to type float.

intValue

Added in API level 1
public abstract int intValue ()

Returns the value of the specified number as an int.

Returns
int the numeric value represented by this object after conversion to type int.

longValue

Added in API level 1
public abstract long longValue ()

Returns the value of the specified number as a long.

Returns
long the numeric value represented by this object after conversion to type long.

shortValue

Added in API level 1
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
short the numeric value represented by this object after conversion to type short.