AtomicLong (Java Platform SE 7 )

java.lang.Object
- java.lang.Number
- - java.util.concurrent.atomic.AtomicLong

All Implemented Interfaces:

Serializable
```
public class AtomicLong
extends Number
implements Serializable
```
A long value that may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables. An AtomicLong is used in applications such as atomically incremented sequence numbers, and cannot be used as a replacement for a Long. However, this class does extend Number to allow uniform access by tools and utilities that deal with numerically-based classes.

Since:

1.5

See Also:
Serialized Form

Constructor Summary

Constructors
Constructor and Description

AtomicLong()
Creates a new AtomicLong with initial value 0.

AtomicLong(long initialValue)
Creates a new AtomicLong with the given initial value.

Constructors
Constructor and Description
`AtomicLong()` Creates a new AtomicLong with initial value `0`.
`AtomicLong(long initialValue)` Creates a new AtomicLong with the given initial value.

Method Summary

Methods
Modifier and Type	Method and Description
`long`	`addAndGet(long delta)` Atomically adds the given value to the current value.
`boolean`	`compareAndSet(long expect, long update)` Atomically sets the value to the given updated value if the current value `==` the expected value.
`long`	`decrementAndGet()` Atomically decrements by one the current value.
`double`	`doubleValue()` Returns the value of the specified number as a `double`.
`float`	`floatValue()` Returns the value of the specified number as a `float`.
`long`	`get()` Gets the current value.
`long`	`getAndAdd(long delta)` Atomically adds the given value to the current value.
`long`	`getAndDecrement()` Atomically decrements by one the current value.
`long`	`getAndIncrement()` Atomically increments by one the current value.
`long`	`getAndSet(long newValue)` Atomically sets to the given value and returns the old value.
`long`	`incrementAndGet()` Atomically increments by one the current value.
`int`	`intValue()` Returns the value of the specified number as an `int`.
`void`	`lazySet(long newValue)` Eventually sets to the given value.
`long`	`longValue()` Returns the value of the specified number as a `long`.
`void`	`set(long newValue)` Sets to the given value.
`String`	`toString()` Returns the String representation of the current value.
`boolean`	`weakCompareAndSet(long expect, long update)` Atomically sets the value to the given updated value if the current value `==` 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
  - AtomicLong
```
public AtomicLong(long initialValue)
```
    Creates a new AtomicLong with the given initial value.
    
    Parameters:
    initialValue - the initial value
  - AtomicLong
```
public AtomicLong()
```
    Creates a new AtomicLong with initial value 0.
- Method Detail
  - get
```
public final long get()
```
    Gets the current value.
    
    Returns:
    the current value
  - set
```
public final void set(long newValue)
```
    Sets to the given value.
    
    Parameters:
    newValue - the new value
  - lazySet
```
public final void lazySet(long newValue)
```
    Eventually sets to the given value.
    
    Parameters:
    newValue - the new value
    Since:
    
    1.6
  - getAndSet
```
public final long getAndSet(long 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(long expect,
                    long update)
```
    Atomically sets the value to the given updated value if the current value == 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 equal to the expected value.
  - weakCompareAndSet
```
public final boolean weakCompareAndSet(long expect,
                        long update)
```
    Atomically sets the value to the given updated value if the current value == 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.
  - getAndIncrement
```
public final long getAndIncrement()
```
    Atomically increments by one the current value.
    
    Returns:
    the previous value
  - getAndDecrement
```
public final long getAndDecrement()
```
    Atomically decrements by one the current value.
    
    Returns:
    the previous value
  - getAndAdd
```
public final long getAndAdd(long delta)
```
    Atomically adds the given value to the current value.
    
    Parameters:
    delta - the value to add
    
    Returns:
    the previous value
  - incrementAndGet
```
public final long incrementAndGet()
```
    Atomically increments by one the current value.
    
    Returns:
    the updated value
  - decrementAndGet
```
public final long decrementAndGet()
```
    Atomically decrements by one the current value.
    
    Returns:
    the updated value
  - addAndGet
```
public final long addAndGet(long 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()
```
    Description copied from class: Number
    
    Returns the value of the specified number as an int. This may involve rounding or truncation.
    
    Specified by:
    
    intValue in class Number
    
    Returns:
    the numeric value represented by this object after conversion to type int.
  - longValue
```
public long longValue()
```
    Description copied from class: Number
    
    Returns the value of the specified number as a long. This may involve rounding or truncation.
    
    Specified by:
    
    longValue in class Number
    
    Returns:
    the numeric value represented by this object after conversion to type long.
  - floatValue
```
public float floatValue()
```
    Description copied from class: Number
    
    Returns the value of the specified number as a float. This may involve rounding.
    
    Specified by:
    
    floatValue in class Number
    
    Returns:
    the numeric value represented by this object after conversion to type float.
  - doubleValue
```
public double doubleValue()
```
    Description copied from class: Number
    
    Returns the value of the specified number as a double. This may involve rounding.
    
    Specified by:
    
    doubleValue in class Number
    
    Returns:
    the numeric value represented by this object after conversion to type double.

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Class AtomicLong

Constructor Summary

Method Summary

Methods inherited from class java.lang.Number

Methods inherited from class java.lang.Object

Constructor Detail

AtomicLong

AtomicLong

Method Detail

get

set

lazySet

getAndSet

compareAndSet

weakCompareAndSet

getAndIncrement

getAndDecrement

getAndAdd

incrementAndGet

decrementAndGet

addAndGet

toString

intValue

longValue

floatValue

doubleValue