compact1, compact2, compact3
java.lang
Class Number
- java.lang.Object
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- java.lang.Number
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- All Implemented Interfaces:
- Serializable
- Direct Known Subclasses:
- AtomicInteger, AtomicLong, BigDecimal, BigInteger, Byte, Double, DoubleAccumulator, DoubleAdder, Float, Integer, Long, LongAccumulator, LongAdder, Short
public abstract class Number extends Object implements Serializable
The abstract classNumberis 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 particularNumberimplementation to a given primitive type is defined by theNumberimplementation in question. For platform classes, the conversion is often analogous to a narrowing primitive conversion or a widening primitive conversion as defining 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 givenNumberimplementation for conversion details.- Since:
- JDK1.0
- See Also:
- Serialized Form
- See The Java™ Language Specification:
- 5.1.2 Widening Primitive Conversions, 5.1.3 Narrowing Primitive Conversions
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Constructor Summary
Constructors Constructor and Description Number()
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method and Description bytebyteValue()Returns the value of the specified number as abyte, which may involve rounding or truncation.abstract doubledoubleValue()Returns the value of the specified number as adouble, which may involve rounding.abstract floatfloatValue()Returns the value of the specified number as afloat, which may involve rounding.abstract intintValue()Returns the value of the specified number as anint, which may involve rounding or truncation.abstract longlongValue()Returns the value of the specified number as along, which may involve rounding or truncation.shortshortValue()Returns the value of the specified number as ashort, which may involve rounding or truncation.
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Method Detail
intValue
public abstract int intValue()
Returns the value of the specified number as anint, which may involve rounding or truncation.- 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, which may involve rounding or truncation.- 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, which may involve rounding.- 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, which may involve rounding.- Returns:
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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, which may involve rounding or truncation.This implementation returns the result of
intValue()cast to abyte.- Returns:
-
the numeric value represented by this object after conversion to type
byte. - Since:
- JDK1.1
shortValue
public short shortValue()
Returns the value of the specified number as ashort, which may involve rounding or truncation.This implementation returns the result of
intValue()cast to ashort.- Returns:
-
the numeric value represented by this object after conversion to type
short. - Since:
- JDK1.1
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