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 typesbyte,double,float, int,long, andshort. The specific semantics of the conversion from the numeric value of a particularNumber implementation to a given primitive type is defined by theNumber implementation in question. For platform classes, the conversion is often analogous to a narrowing primitive conversion or a widening primitive conversion as defined inThe 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 givenNumber implementation for conversion details.- SeeJava Language Specification:
- 5.1.2 Widening Primitive Conversion
5.1.3 Narrowing Primitive Conversion - Since:
- 1.0
- See Also:
Constructor Summary
ConstructorsMethod Summary
Modifier and TypeMethodDescriptionbyteReturns the value of the specified number as abyte.abstract doubleReturns the value of the specified number as adouble.abstract floatReturns the value of the specified number as afloat.abstract intintValue()Returns the value of the specified number as anint.abstract longReturns the value of the specified number as along.shortReturns 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