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java.util.concurrent.atomic
Class AtomicInteger
java.lang.Object
java.lang.Number
java.util.concurrent.atomic.AtomicInteger
-
All Implemented Interfaces:
-
Serializable
-
public class AtomicInteger
- extends Number
- implements Serializable
An
int
value that may be updated atomically. See the
java.util.concurrent.atomic
package specification for description of the properties of atomic variables. An
AtomicInteger
is used in applications such as atomically incremented counters, and cannot be used as a replacement for an
Integer
. 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
|
AtomicInteger
()
Creates
Create
a new AtomicInteger with initial value
0
. |
AtomicInteger
(int initialValue)
Creates
Create
a new AtomicInteger with the given initial value. |
Method Summary
|
int |
addAndGet
(int delta)
Atomically
adds
add
the given value to
the
current value. |
boolean |
compareAndSet
(int expect, int update)
Atomically
sets
set
the value to the given updated value if the current value
==
the expected value. |
int |
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. |
int |
get
()
Gets
Get
the current value. |
int |
getAndAdd
(int delta)
Atomically
adds
add
the given value to
the
current value. |
int |
getAndDecrement
()
Atomically
decrements
decrement
by one the current value. |
int |
getAndIncrement
()
Atomically
increments
increment
by one the current value. |
int |
getAndSet
(int newValue)
Atomically sets
Set
to the
given
give
value and
returns
return
the old value. |
int |
incrementAndGet
()
Atomically
increments
increment
by one the current value. |
int |
intValue
()
Returns the value of the specified number as an int. |
void
|
lazySet
(int newValue)
Eventually sets to the given value.
|
long |
longValue
()
Returns the value of the specified number as a long. |
void |
set
(int newValue)
Sets
Set
to the given value. |
String
|
toString
()
Returns the String representation of the current value. |
boolean |
weakCompareAndSet
(int expect, int 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
|
AtomicInteger
public AtomicInteger(int initialValue)
-
Creates
Create
a new AtomicInteger with the given initial value.
-
Parameters:
-
initialValue - the initial value
AtomicInteger
public AtomicInteger()
-
Creates
Create
a new AtomicInteger with initial value
0
.
get
public final int get()
-
Gets
Get
the current value.
-
-
-
Returns:
-
the current value
set
public final void set(int newValue)
-
Sets
Set
to the given value.
-
-
-
Parameters:
-
newValue - the new value
lazySet
public final void
lazySet
(int newValue)
-
Eventually sets to the given value.
-
-
-
Parameters:
-
newValue - the new value
-
Since:
-
1.6
getAndSet
public final int getAndSet(int 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(int expect,
int 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(int expect,
int 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 int getAndIncrement()
-
Atomically
increments
increment
by one the current value.
-
-
-
Returns:
-
the previous value
getAndDecrement
public final int getAndDecrement()
-
Atomically
decrements
decrement
by one the current value.
-
-
-
Returns:
-
the previous value
getAndAdd
public final int getAndAdd(int delta)
-
Atomically
adds
add
the given value to
the
current value.
-
-
-
Parameters:
-
delta - the value to add
-
Returns:
-
the previous value
incrementAndGet
public final int incrementAndGet()
-
Atomically
increments
increment
by one the current value.
-
-
-
Returns:
-
the updated value
decrementAndGet
public final int decrementAndGet()
-
Atomically
decrements
decrement
by one the current value.
-
-
-
Returns:
-
the updated value
addAndGet
public final int addAndGet(int 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.