compact1, compact2, compact3
java.util.concurrent.atomic
Class AtomicBoolean
- java.lang.Object
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- java.util.concurrent.atomic.AtomicBoolean
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- All Implemented Interfaces:
- Serializable
public class AtomicBoolean extends Object implements Serializable
Abooleanvalue that may be updated atomically. See thejava.util.concurrent.atomicpackage specification for description of the properties of atomic variables. AnAtomicBooleanis used in applications such as atomically updated flags, and cannot be used as a replacement for aBoolean.- Since:
- 1.5
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor and Description AtomicBoolean()Creates a newAtomicBooleanwith initial valuefalse.AtomicBoolean(boolean initialValue)Creates a newAtomicBooleanwith the given initial value.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method and Description booleancompareAndSet(boolean expect, boolean update)Atomically sets the value to the given updated value if the current value==the expected value.booleanget()Returns the current value.booleangetAndSet(boolean newValue)Atomically sets to the given value and returns the previous value.voidlazySet(boolean newValue)Eventually sets to the given value.voidset(boolean newValue)Unconditionally sets to the given value.StringtoString()Returns the String representation of the current value.booleanweakCompareAndSet(boolean expect, boolean update)Atomically sets the value to the given updated value if the current value==the expected value.
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Constructor Detail
AtomicBoolean
public AtomicBoolean(boolean initialValue)
Creates a newAtomicBooleanwith the given initial value.- Parameters:
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initialValue- the initial value
AtomicBoolean
public AtomicBoolean()
Creates a newAtomicBooleanwith initial valuefalse.
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Method Detail
get
public final boolean get()
Returns the current value.- Returns:
- the current value
compareAndSet
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:
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expect- the expected value -
update- the new value - Returns:
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trueif successful. False return indicates that the actual value was not equal to the expected value.
weakCompareAndSet
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:
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expect- the expected value -
update- the new value - Returns:
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trueif successful
set
public final void set(boolean newValue)
Unconditionally sets to the given value.- Parameters:
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newValue- the new value
lazySet
public final void lazySet(boolean newValue)
Eventually sets to the given value.- Parameters:
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newValue- the new value - Since:
- 1.6
getAndSet
public final boolean getAndSet(boolean newValue)
Atomically sets to the given value and returns the previous value.- Parameters:
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newValue- the new value - Returns:
- the previous value
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