Class Number
java.lang.Object
java.lang.Number
- 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:
-
Constructor Summary
-
Method Summary
Modifier and TypeMethodDescriptionbyte
Returns the value of the specified number as abyte
.abstract double
Returns the value of the specified number as adouble
.abstract float
Returns the value of the specified number as afloat
.abstract int
intValue()
Returns the value of the specified number as anint
.abstract long
Returns the value of the specified number as along
.short
Returns the value of the specified number as ashort
.
-
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 anint
.- 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 along
.- 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 afloat
.- 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 adouble
.- 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 abyte
.- Implementation Requirements:
- The default implementation returns the result of
intValue()
cast to abyte
. - 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 ashort
.- Implementation Requirements:
- The default implementation returns the result of
intValue()
cast to ashort
. - Returns:
- the numeric value represented by this object after conversion
to type
short
. - Since:
- 1.1
-