Java Module java.base Package java.util.concurrent.atomic Class AtomicBoolean（JDK11）

Constructor Detail

• AtomicBoolean

  public AtomicBoolean​(boolean initialValue)

  Creates a new AtomicBoolean with the given initial value.

  Parameters:

  initialValue - the initial value

• AtomicBoolean

  public AtomicBoolean()

  Creates a new AtomicBoolean with initial value false.

Method Detail

• get

  public final boolean get()

  Returns the current value, with memory effects as specified by VarHandle.getVolatile(java.lang.Object...).

  Returns:

  the current value

• compareAndSet

  public final boolean compareAndSet​(boolean expectedValue,
                                     boolean newValue)

  Atomically sets the value to newValue if the current value == expectedValue, with memory effects as specified by VarHandle.compareAndSet(java.lang.Object...).

  Parameters:

  expectedValue - the expected value

  newValue - the new value

  Returns:

  true if successful. False return indicates that the actual value was not equal to the expected value.

• weakCompareAndSet

  @Deprecated(since="9")
  public boolean weakCompareAndSet​(boolean expectedValue,
                                   boolean newValue)

  Deprecated.

  This method has plain memory effects but the method name implies volatile memory effects (see methods such as compareAndExchange(boolean, boolean) and compareAndSet(boolean, boolean)). To avoid confusion over plain or volatile memory effects it is recommended that the method weakCompareAndSetPlain(boolean, boolean) be used instead.
  Possibly atomically sets the value to newValue if the current value == expectedValue, with memory effects as specified by VarHandle.weakCompareAndSetPlain(java.lang.Object...).

  Parameters:

  expectedValue - the expected value

  newValue - the new value

  Returns:

  true if successful

  See Also:

  weakCompareAndSetPlain(boolean, boolean)

• weakCompareAndSetPlain

  public boolean weakCompareAndSetPlain​(boolean expectedValue,
                                        boolean newValue)

  Possibly atomically sets the value to newValue if the current value == expectedValue, with memory effects as specified by VarHandle.weakCompareAndSetPlain(java.lang.Object...).

  Parameters:

  expectedValue - the expected value

  newValue - the new value

  Returns:

  true if successful

  Since:

  9

• set

  public final void set​(boolean newValue)

  Sets the value to newValue, with memory effects as specified by VarHandle.setVolatile(java.lang.Object...).

  Parameters:

  newValue - the new value

• lazySet

  public final void lazySet​(boolean newValue)

  Sets the value to newValue, with memory effects as specified by VarHandle.setRelease(java.lang.Object...).

  Parameters:

  newValue - the new value

  Since:

  1.6

• getAndSet

  public final boolean getAndSet​(boolean newValue)

  Atomically sets the value to newValue and returns the old value, with memory effects as specified by VarHandle.getAndSet(java.lang.Object...).

  Parameters:

  newValue - the new value

  Returns:

  the previous 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

• getPlain

  public final boolean getPlain()

  Returns the current value, with memory semantics of reading as if the variable was declared non-volatile.

  Returns:

  the value

  Since:

  9

• setPlain

  public final void setPlain​(boolean newValue)

  Sets the value to newValue, with memory semantics of setting as if the variable was declared non-volatile and non-final.

  Parameters:

  newValue - the new value

  Since:

  9

• getOpaque

  public final boolean getOpaque()

  Returns the current value, with memory effects as specified by VarHandle.getOpaque(java.lang.Object...).

  Returns:

  the value

  Since:

  9

• setOpaque

  public final void setOpaque​(boolean newValue)

  Sets the value to newValue, with memory effects as specified by VarHandle.setOpaque(java.lang.Object...).

  Parameters:

  newValue - the new value

  Since:

  9

• getAcquire

  public final boolean getAcquire()

  Returns the current value, with memory effects as specified by VarHandle.getAcquire(java.lang.Object...).

  Returns:

  the value

  Since:

  9

• setRelease

  public final void setRelease​(boolean newValue)

  Sets the value to newValue, with memory effects as specified by VarHandle.setRelease(java.lang.Object...).

  Parameters:

  newValue - the new value

  Since:

  9

• compareAndExchange

  public final boolean compareAndExchange​(boolean expectedValue,
                                          boolean newValue)

  Atomically sets the value to newValue if the current value, referred to as the witness value, == expectedValue, with memory effects as specified by VarHandle.compareAndExchange(java.lang.Object...).

  Parameters:

  expectedValue - the expected value

  newValue - the new value

  Returns:

  the witness value, which will be the same as the expected value if successful

  Since:

  9

• compareAndExchangeAcquire

  public final boolean compareAndExchangeAcquire​(boolean expectedValue,
                                                 boolean newValue)

  Atomically sets the value to newValue if the current value, referred to as the witness value, == expectedValue, with memory effects as specified by VarHandle.compareAndExchangeAcquire(java.lang.Object...).

  Parameters:

  expectedValue - the expected value

  newValue - the new value

  Returns:

  the witness value, which will be the same as the expected value if successful

  Since:

  9

• compareAndExchangeRelease

  public final boolean compareAndExchangeRelease​(boolean expectedValue,
                                                 boolean newValue)

  Atomically sets the value to newValue if the current value, referred to as the witness value, == expectedValue, with memory effects as specified by VarHandle.compareAndExchangeRelease(java.lang.Object...).

  Parameters:

  expectedValue - the expected value

  newValue - the new value

  Returns:

  the witness value, which will be the same as the expected value if successful

  Since:

  9

• weakCompareAndSetVolatile

  public final boolean weakCompareAndSetVolatile​(boolean expectedValue,
                                                 boolean newValue)

  Possibly atomically sets the value to newValue if the current value == expectedValue, with memory effects as specified by VarHandle.weakCompareAndSet(java.lang.Object...).

  Parameters:

  expectedValue - the expected value

  newValue - the new value

  Returns:

  true if successful

  Since:

  9

• weakCompareAndSetAcquire

  public final boolean weakCompareAndSetAcquire​(boolean expectedValue,
                                                boolean newValue)

  Possibly atomically sets the value to newValue if the current value == expectedValue, with memory effects as specified by VarHandle.weakCompareAndSetAcquire(java.lang.Object...).

  Parameters:

  expectedValue - the expected value

  newValue - the new value

  Returns:

  true if successful

  Since:

  9

• weakCompareAndSetRelease

  public final boolean weakCompareAndSetRelease​(boolean expectedValue,
                                                boolean newValue)

  Possibly atomically sets the value to newValue if the current value == expectedValue, with memory effects as specified by VarHandle.weakCompareAndSetRelease(java.lang.Object...).

  Parameters:

  expectedValue - the expected value

  newValue - the new value

  Returns:

  true if successful

  Since:

  9