public class AtomicDouble
extends java.lang.Number
double
value that may be updated atomically. See the
java.util.concurrent.atomic
package specification for
description of the properties of atomic variables. An AtomicDouble
is used in applications such as atomic accumulation,
and cannot be used as a replacement for a Double
. However,
this class does extend Number
to allow uniform access by
tools and utilities that deal with numerically-based classes.
This class compares primitive double
values in methods such as compareAndSet(double, double)
by comparing their
bitwise representation using Double.doubleToRawLongBits(double)
,
which differs from both the primitive double ==
operator
and from Double.equals(java.lang.Object)
, as if implemented by:
static boolean bitEquals(double x, double y) {
long xBits = Double.doubleToRawLongBits(x);
long yBits = Double.doubleToRawLongBits(y);
return xBits == yBits;
}
See jsr166e.DoubleMaxUpdater
,
Serialized FormConstructor and Description |
---|
AtomicDouble()
Creates a new
AtomicDouble with initial value 0.0 . |
AtomicDouble(double initialValue)
Creates a new
AtomicDouble with the given initial value. |
Modifier and Type | Method and Description |
---|---|
double |
addAndGet(double delta)
Atomically adds the given value to the current value.
|
boolean |
compareAndSet(double expect,
double update)
Atomically sets the value to the given updated value
if the current value is bitwise equal
to the expected value.
|
double |
doubleValue()
Returns the value of this
AtomicDouble as a double . |
float |
floatValue()
Returns the value of this
AtomicDouble as a float
after a narrowing primitive conversion. |
double |
get()
Gets the current value.
|
double |
getAndAdd(double delta)
Atomically adds the given value to the current value.
|
double |
getAndSet(double newValue)
Atomically sets to the given value and returns the old value.
|
int |
intValue()
Returns the value of this
AtomicDouble as an int
after a narrowing primitive conversion. |
void |
lazySet(double newValue)
Eventually sets to the given value.
|
long |
longValue()
Returns the value of this
AtomicDouble as a long
after a narrowing primitive conversion. |
void |
set(double newValue)
Sets to the given value.
|
java.lang.String |
toString()
Returns the String representation of the current value.
|
boolean |
weakCompareAndSet(double expect,
double update)
Atomically sets the value to the given updated value
if the current value is bitwise equal
to the expected value.
|
public AtomicDouble(double initialValue)
AtomicDouble
with the given initial value.initialValue
- the initial valuepublic AtomicDouble()
AtomicDouble
with initial value 0.0
.public final double get()
public final void set(double newValue)
newValue
- the new valuepublic final void lazySet(double newValue)
newValue
- the new valuepublic final double getAndSet(double newValue)
newValue
- the new valuepublic final boolean compareAndSet(double expect, double update)
expect
- the expected valueupdate
- the new valuetrue
if successful. False return indicates that
the actual value was not bitwise equal to the expected value.public final boolean weakCompareAndSet(double expect, double update)
May fail spuriously and does not provide ordering guarantees,
so is only rarely an appropriate alternative to compareAndSet
.
expect
- the expected valueupdate
- the new valuetrue
if successfulpublic final double getAndAdd(double delta)
delta
- the value to addpublic final double addAndGet(double delta)
delta
- the value to addpublic java.lang.String toString()
toString
in class java.lang.Object
public int intValue()
AtomicDouble
as an int
after a narrowing primitive conversion.intValue
in class java.lang.Number
public long longValue()
AtomicDouble
as a long
after a narrowing primitive conversion.longValue
in class java.lang.Number
public float floatValue()
AtomicDouble
as a float
after a narrowing primitive conversion.floatValue
in class java.lang.Number
public double doubleValue()
AtomicDouble
as a double
.doubleValue
in class java.lang.Number