Class java.lang.Number - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.lang.Number

java.lang.Object
   |
   +----java.lang.Number

public abstract class Number
extends Object
implements Serializable

The abstract class Number is the superclass of classes Byte, Double, Float, Integer, Long, and Short.

Subclasses of Number must provide methods to convert the represented numeric value to byte, double, float, int, long, and short.

See Also:: Byte, Double, Float, Integer, Long, Short

Number()

byteValue(): Returns the value of the specified number as a byte.
doubleValue(): Returns the value of the specified number as a double.
floatValue(): Returns the value of the specified number as a float.
intValue(): Returns the value of the specified number as an int.
longValue(): Returns the value of the specified number as a long.
shortValue(): Returns the value of the specified number as a short.

Number

 public Number()

intValue

 public abstract int intValue()

Returns the value of the specified number as an int. This may involve rounding.

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 a long. This may involve rounding.

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 a float. This 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 a double. This may involve rounding.

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 a byte. This may involve rounding or truncation.

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

shortValue

 public short shortValue()

Returns the value of the specified number as a short. This may involve rounding or truncation.

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

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