public class LongMaxUpdater extends Number implements Serializable
long maximum
with initial value Long.MIN_VALUE. When updates (method
update(long)) are contended across threads, the set of variables may grow
dynamically to reduce contention. Method max() (or, equivalently, longValue()) returns the current maximum
across the variables maintaining updates.
This class extends Number, but does not define methods
such as equals, hashCode and compareTo because instances are expected to be mutated, and so are not
useful as collection keys.
jsr166e note: This class is targeted to be placed in java.util.concurrent.atomic.
| 构造器和说明 |
|---|
LongMaxUpdater()
Creates a new instance with initial maximum of
Long.MIN_VALUE. |
| 限定符和类型 | 方法和说明 |
|---|---|
double |
doubleValue()
Returns the
max() as a double after a widening primitive
conversion. |
float |
floatValue()
Returns the
max() as a float after a widening primitive
conversion. |
int |
intValue()
Returns the
max() as an int after a narrowing primitive
conversion. |
long |
longValue()
Equivalent to
max(). |
long |
max()
Returns the current maximum.
|
long |
maxThenReset()
|
void |
reset()
Resets variables maintaining updates to
Long.MIN_VALUE. |
String |
toString()
Returns the String representation of the
max(). |
void |
update(long x)
Updates the maximum to be at least the given value.
|
byteValue, shortValuepublic LongMaxUpdater()
Long.MIN_VALUE.public void update(long x)
x - the value to updatepublic long max()
public void reset()
Long.MIN_VALUE. This
method may be a useful alternative to creating a new updater, but is only
effective if there are no concurrent updates. Because this method is
intrinsically racy, it should only be used when it is known that no
threads are concurrently updating.public long maxThenReset()
max() followed by reset(). This method may apply for example during quiescent points
between multithreaded computations. If there are updates concurrent with
this method, the returned value is
not guaranteed to be the final value occurring before the reset.public int intValue()
max() as an int after a narrowing primitive
conversion.public float floatValue()
max() as a float after a widening primitive
conversion.floatValue 在类中 Numberpublic double doubleValue()
max() as a double after a widening primitive
conversion.doubleValue 在类中 NumberCopyright © 2013 The Skfiy Open Association. All Rights Reserved.