public class AtomicDoubleArray extends Object implements Serializable
double array in which elements may be updated atomically. See the
java.util.concurrent.atomic package specification for description of
the properties of atomic variables.
This class compares primitive double values in
methods such as compareAndSet(int, 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;
}| 构造器和说明 |
|---|
AtomicDoubleArray(double[] array)
Creates a new
AtomicDoubleArray with the same length as, and all
elements copied from, the given array. |
AtomicDoubleArray(int length)
Creates a new
AtomicDoubleArray of the given length, with all
elements initially zero. |
| 限定符和类型 | 方法和说明 |
|---|---|
double |
addAndGet(int i,
double delta)
Atomically adds the given value to the element at index
i. |
boolean |
compareAndSet(int i,
double expect,
double update)
Atomically sets the element at position
i to the given updated
value if the current value is bitwise equal
to the expected value. |
double |
get(int i)
Gets the current value at position
i. |
double |
getAndAdd(int i,
double delta)
Atomically adds the given value to the element at index
i. |
double |
getAndSet(int i,
double newValue)
Atomically sets the element at position
i to the given value and
returns the old value. |
void |
lazySet(int i,
double newValue)
Eventually sets the element at position
i to the given value. |
int |
length()
Returns the length of the array.
|
void |
set(int i,
double newValue)
Sets the element at position
i to the given value. |
String |
toString()
Returns the String representation of the current values of array.
|
boolean |
weakCompareAndSet(int i,
double expect,
double update)
Atomically sets the element at position
i to the given updated
value if the current value is bitwise equal
to the expected value. |
public AtomicDoubleArray(int length)
AtomicDoubleArray of the given length, with all
elements initially zero.length - the length of the arraypublic AtomicDoubleArray(double[] array)
AtomicDoubleArray with the same length as, and all
elements copied from, the given array.array - the array to copy elements fromNullPointerException - if array is nullpublic final int length()
public final double get(int i)
i.i - the indexpublic final void set(int i,
double newValue)
i to the given value.i - the indexnewValue - the new valuepublic final void lazySet(int i,
double newValue)
i to the given value.i - the indexnewValue - the new valuepublic final double getAndSet(int i,
double newValue)
i to the given value and
returns the old value.i - the indexnewValue - the new valuepublic final boolean compareAndSet(int i,
double expect,
double update)
i to the given updated
value if the current value is bitwise equal
to the expected value.i - the indexexpect - the expected valueupdate - the new valuepublic final boolean weakCompareAndSet(int i,
double expect,
double update)
i to the given updated
value if the current value is bitwise equal
to the expected value.
May fail spuriously and does not provide ordering guarantees, so is
only rarely an appropriate alternative to compareAndSet.
i - the indexexpect - the expected valueupdate - the new valuepublic final double getAndAdd(int i,
double delta)
i.i - the indexdelta - the value to addpublic double addAndGet(int i,
double delta)
i.i - the indexdelta - the value to addCopyright © 2013 The Skfiy Open Association. All Rights Reserved.