Class Overview
A boolean value that may be updated atomically. See the
java.util.concurrent.atomic package specification for
description of the properties of atomic variables. An
AtomicBoolean is used in applications such as atomically
updated flags, and cannot be used as a replacement for a
Boolean.
Summary
| Public Constructors |
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AtomicBoolean(boolean initialValue)
Creates a new AtomicBoolean with the given initial value.
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AtomicBoolean()
Creates a new AtomicBoolean with initial value false.
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| Public Methods |
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final
boolean
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compareAndSet(boolean expect, boolean update)
Atomically sets the value to the given updated value
if the current value == the expected value.
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final
boolean
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get()
Returns the current value.
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final
boolean
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getAndSet(boolean newValue)
Atomically sets to the given value and returns the previous value.
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final
void
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lazySet(boolean newValue)
Eventually sets to the given value.
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final
void
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set(boolean newValue)
Unconditionally sets to the given value.
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String
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toString()
Returns the String representation of the current value.
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boolean
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weakCompareAndSet(boolean expect, boolean update)
Atomically sets the value to the given updated value
if the current value == the expected value.
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[Expand]
Inherited Methods |
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From class java.lang.Object
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Object
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clone()
Creates and returns a copy of this Object.
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boolean
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equals(Object o)
Compares this instance with the specified object and indicates if they
are equal.
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void
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finalize()
Called before the object's memory is reclaimed by the VM.
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final
Class<? extends Object>
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getClass()
Returns the unique instance of Class that represents this
object's class. |
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int
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hashCode()
Returns an integer hash code for this object.
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final
void
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notify()
Causes a thread which is waiting on this object's monitor (by means of
calling one of the wait() methods) to be woken up.
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final
void
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notifyAll()
Causes all threads which are waiting on this object's monitor (by means
of calling one of the wait() methods) to be woken up.
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String
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toString()
Returns a string containing a concise, human-readable description of this
object.
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final
void
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wait()
Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.
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final
void
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wait(long millis, int nanos)
Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the
specified timeout expires.
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final
void
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wait(long millis)
Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the
specified timeout expires.
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Public Constructors
public
AtomicBoolean
(boolean initialValue)
Creates a new AtomicBoolean with the given initial value.
Parameters
| initialValue
| the initial value
|
public
AtomicBoolean
()
Creates a new AtomicBoolean with initial value false.
Public Methods
public
final
boolean
compareAndSet
(boolean expect, boolean 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.
public
final
boolean
get
()
Returns the current value.
public
final
boolean
getAndSet
(boolean newValue)
Atomically sets to the given value and returns the previous value.
public
final
void
lazySet
(boolean newValue)
Eventually sets to the given value.
public
final
void
set
(boolean newValue)
Unconditionally sets to the given value.
public
String
toString
()
Returns the String representation of the current value.
Returns
- the String representation of the current value.
public
boolean
weakCompareAndSet
(boolean expect, boolean 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 |
