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Number (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档
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Java™ Platform Standard Ed. 6 |
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java.lang
Class Number
java.lang.Objectjava.lang.Number
- All Implemented Interfaces:
- Serializable
- Direct Known Subclasses:
- AtomicInteger, AtomicLong, BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, Short
public abstract class Number
- extends Object
- implements Serializable
- extends Object
The abstract class Number is the superclass of classes
BigDecimal, BigInteger,
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.
| Constructor Summary | |
|---|---|
Number()
|
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| Method Summary | |
|---|---|
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. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
Number
public Number()
| Method Detail |
|---|
intValue
public abstract int intValue()
- Returns the value of the specified number as an
int. This 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 a
long. This 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 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. - Since:
- JDK1.1
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. - Since:
- JDK1.1
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Java™ Platform Standard Ed. 6 |
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Submit a bug or feature
For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.