AtomicDouble (Guava: Google Core Libraries for Java 15.0 API)

java.lang.Object
- java.lang.Number
- - com.google.common.util.concurrent.AtomicDouble

All Implemented Interfaces:

Serializable
```
public class AtomicDouble
extends Number
implements Serializable
```
A 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;
 }
```
It is possible to write a more scalable updater, at the cost of giving up strict atomicity. See for example DoubleAdder and DoubleMaxUpdater.
Since:

11.0

Author:

Doug Lea, Martin Buchholz

See Also:
Serialized Form

Constructor Summary

Constructors
Constructor and Description
`AtomicDouble()` Creates a new `AtomicDouble` with initial value `0.0`.
`AtomicDouble(double initialValue)` Creates a new `AtomicDouble` with the given initial value.

Method Summary

Methods
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.
`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.

Methods inherited from class java.lang.Number
byteValue, shortValue

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - AtomicDouble
```
public AtomicDouble(double initialValue)
```
    Creates a new AtomicDouble with the given initial value.
    
    Parameters:
    initialValue - the initial value
  - AtomicDouble
```
public AtomicDouble()
```
    Creates a new AtomicDouble with initial value 0.0.
- Method Detail
  - get
```
public final double get()
```
    Gets the current value.
    
    Returns:
    the current value
  - set
```
public final void set(double newValue)
```
    Sets to the given value.
    
    Parameters:
    newValue - the new value
  - lazySet
```
public final void lazySet(double newValue)
```
    Eventually sets to the given value.
    
    Parameters:
    newValue - the new value
  - getAndSet
```
public final double getAndSet(double newValue)
```
    Atomically sets to the given value and returns the old value.
    
    Parameters:
    newValue - the new value
    
    Returns:
    the previous value
  - compareAndSet
```
public final 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.
    
    Parameters:
    expect - the expected value
    update - the new value
    
    Returns:
    true if successful. False return indicates that the actual value was not bitwise equal to the expected value.
  - weakCompareAndSet
```
public final 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.
    May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet.
    
    Parameters:
    expect - the expected value
    update - the new value
    
    Returns:
    true if successful
  - getAndAdd
```
public final double getAndAdd(double delta)
```
    Atomically adds the given value to the current value.
    
    Parameters:
    delta - the value to add
    
    Returns:
    the previous value
  - addAndGet
```
public final double addAndGet(double delta)
```
    Atomically adds the given value to the current value.
    
    Parameters:
    delta - the value to add
    
    Returns:
    the updated value
  - toString
```
public String toString()
```
    Returns the String representation of the current value.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    the String representation of the current value
  - intValue
```
public int intValue()
```
    Returns the value of this AtomicDouble as an int after a narrowing primitive conversion.
    
    Specified by:
    
    intValue in class Number
    
    Returns:
    the numeric value represented by this object after conversion to type int.
  - longValue
```
public long longValue()
```
    Returns the value of this AtomicDouble as a long after a narrowing primitive conversion.
    
    Specified by:
    
    longValue in class Number
    
    Returns:
    the numeric value represented by this object after conversion to type long.
  - floatValue
```
public float floatValue()
```
    Returns the value of this AtomicDouble as a float after a narrowing primitive conversion.
    
    Specified by:
    
    floatValue in class Number
    
    Returns:
    the numeric value represented by this object after conversion to type float.
  - doubleValue
```
public double doubleValue()
```
    Returns the value of this AtomicDouble as a double.
    
    Specified by:
    
    doubleValue in class Number
    
    Returns:
    the numeric value represented by this object after conversion to type double.

Class AtomicDouble

Constructor Summary

Method Summary

Methods inherited from class java.lang.Number

Methods inherited from class java.lang.Object

Constructor Detail

AtomicDouble

AtomicDouble

Method Detail

get

set

lazySet

getAndSet

compareAndSet

weakCompareAndSet

getAndAdd

addAndGet

toString

intValue

longValue

floatValue

doubleValue