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java.util.concurrent.atomic
Class AtomicLong
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
|
AtomicLong
()
Creates
Create
a new AtomicLong with initial value
0
. |
AtomicLong
(long initialValue)
Creates
Create
a new AtomicLong with the given initial value. |
Method Summary
|
long |
addAndGet
(long delta)
Atomically
adds
add
the given value to
the
current value. |
boolean |
compareAndSet
(long expect, long update)
Atomically
sets
set
the value to the given updated value if the current value
==
the expected value. |
long |
decrementAndGet
()
Atomically
decrements
decrement
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
Get
the current value. |
long |
getAndAdd
(long delta)
Atomically
adds
add
the given value to
the
current value. |
long |
getAndDecrement
()
Atomically
decrements
decrement
by one the current value. |
long |
getAndIncrement
()
Atomically
increments
increment
by one the current value. |
long |
getAndSet
(long newValue)
Atomically sets
Set
to the
given
give
value and
returns
return
the old value. |
long |
incrementAndGet
()
Atomically
increments
increment
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
Set
to the given value. |
String
|
toString
()
Returns the String representation of the current value. |
boolean |
weakCompareAndSet
(long expect, long update)
Atomically
sets
set
the value to the given updated value if the current value
==
the expected value. |
Methods inherited from class java.lang.
Number
|
byteValue
,
shortValue
|
AtomicLong
public AtomicLong(long initialValue)
-
Creates
Create
a new AtomicLong with the given initial value.
-
Parameters:
-
initialValue - the initial value
AtomicLong
public AtomicLong()
-
Creates
Create
a new AtomicLong with initial value
0
.
get
public final long get()
-
Gets
Get
the current value.
-
-
-
Returns:
-
the current value
set
public final void set(long newValue)
-
Sets
Set
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
Set
to the
given
give
value and
returns
return
the old value.
-
-
-
Parameters:
-
newValue - the new value
-
Returns:
-
the previous value
compareAndSet
public final boolean compareAndSet(long expect,
long update)
-
Atomically
sets
set
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
set
the value to the given updated value if the current value
==
the expected value. May fail spuriously.
-
-
-
Parameters:
-
expect - the expected value
-
update - the new value
-
Returns:
-
true if successful.
getAndIncrement
public final long getAndIncrement()
-
Atomically
increments
increment
by one the current value.
-
-
-
Returns:
-
the previous value
getAndDecrement
public final long getAndDecrement()
-
Atomically
decrements
decrement
by one the current value.
-
-
-
Returns:
-
the previous value
getAndAdd
public final long getAndAdd(long delta)
-
Atomically
adds
add
the given value to
the
current value.
-
-
-
Parameters:
-
delta - the value to add
-
Returns:
-
the previous value
incrementAndGet
public final long incrementAndGet()
-
Atomically
increments
increment
by one the current value.
-
-
-
Returns:
-
the updated value
decrementAndGet
public final long decrementAndGet()
-
Atomically
decrements
decrement
by one the current value.
-
-
-
Returns:
-
the updated value
addAndGet
public final long addAndGet(long delta)
-
Atomically
adds
add
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.