File	Doc	Category	Size	Date	Package
AtomicBoolean.java	API Doc	Java SE 5 API	3489	Fri Aug 26 14:57:26 BST 2005	java.util.concurrent.atomic

AtomicBoolean

• java.lang.Object

Fields Summary
private static final long	serialVersionUID
private static final Unsafe	unsafe
private static final long	valueOffset
private volatile int	value

Constructors Summary
public AtomicBoolean(boolean initialValue) Creates a new AtomicBoolean with the given initial value. param initialValue the initial value value = initialValue ? 1 : 0;
public AtomicBoolean() Creates a new AtomicBoolean with initial value false.

Methods Summary
public final boolean	compareAndSet(boolean expect, boolean update) Atomically set the value to the given updated value if the current value == the expected value. param expect the expected value param update the new value return true if successful. False return indicates that the actual value was not equal to the expected value. int e = expect ? 1 : 0; int u = update ? 1 : 0; return unsafe.compareAndSwapInt(this, valueOffset, e, u);
public final boolean	get() Returns the current value. return the current value return value != 0;
public final boolean	getAndSet(boolean newValue) Sets to the given value and returns the previous value. param newValue the new value return the previous value for (;;) { boolean current = get(); if (compareAndSet(current, newValue)) return current; }
public final void	set(boolean newValue) Unconditionally sets to the given value. param newValue the new value value = newValue ? 1 : 0;
public java.lang.String	toString() Returns the String representation of the current value. return the String representation of the current value. return Boolean.toString(get());
public boolean	weakCompareAndSet(boolean expect, boolean update) Atomically set the value to the given updated value if the current value == the expected value. May fail spuriously. param expect the expected value param update the new value return true if successful. int e = expect ? 1 : 0; int u = update ? 1 : 0; return unsafe.compareAndSwapInt(this, valueOffset, e, u);