程序包 java.util.concurrent.atomic

类 AtomicLongArray

java.lang.Object

java.util.concurrent.atomic.AtomicLongArray

所有已实现的接口:

Serializable

public class AtomicLongArray
extends Object
implements Serializable

A long array in which elements may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables.

从以下版本开始:

1.5

另请参阅:

序列化表格

构造器概要

构造器

构造器	说明
AtomicLongArray(int length)	Creates a new AtomicLongArray of the given length, with all elements initially zero.
AtomicLongArray(long[] array)	Creates a new AtomicLongArray with the same length as, and all elements copied from, the given array.

方法概要

限定符和类型	方法	说明
long	accumulateAndGet(int i, long x, LongBinaryOperator accumulatorFunction)	Atomically updates the element at index i with the results of applying the given function to the current and given values, returning the updated value.
long	addAndGet(int i, long delta)	Atomically adds the given value to the element at index i.
boolean	compareAndSet(int i, long expect, long update)	Atomically sets the element at position i to the given updated value if the current value == the expected value.
long	decrementAndGet(int i)	Atomically decrements by one the element at index i.
long	get(int i)	Gets the current value at position i.
long	getAndAccumulate(int i, long x, LongBinaryOperator accumulatorFunction)	Atomically updates the element at index i with the results of applying the given function to the current and given values, returning the previous value.
long	getAndAdd(int i, long delta)	Atomically adds the given value to the element at index i.
long	getAndDecrement(int i)	Atomically decrements by one the element at index i.
long	getAndIncrement(int i)	Atomically increments by one the element at index i.
long	getAndSet(int i, long newValue)	Atomically sets the element at position i to the given value and returns the old value.
long	getAndUpdate(int i, LongUnaryOperator updateFunction)	Atomically updates the element at index i with the results of applying the given function, returning the previous value.
long	incrementAndGet(int i)	Atomically increments by one the element at index i.
void	lazySet(int i, long newValue)	Eventually sets the element at position i to the given value.
int	length()	Returns the length of the array.
void	set(int i, long newValue)	Sets the element at position i to the given value.
String	toString()	Returns the String representation of the current values of array.
long	updateAndGet(int i, LongUnaryOperator updateFunction)	Atomically updates the element at index i with the results of applying the given function, returning the updated value.
boolean	weakCompareAndSet(int i, long expect, long update)	Atomically sets the element at position i to the given updated value if the current value == the expected value.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

构造器详细资料

AtomicLongArray

public AtomicLongArray(int length)

Creates a new AtomicLongArray of the given length, with all elements initially zero.

参数:

length - the length of the array

AtomicLongArray

public AtomicLongArray(long[] array)

Creates a new AtomicLongArray with the same length as, and all elements copied from, the given array.

参数:

array - the array to copy elements from

抛出:

NullPointerException - if array is null

方法详细资料

length

public final int length()

Returns the length of the array.

返回:

the length of the array

get

public final long get(int i)

Gets the current value at position i.

参数:

i - the index

返回:

the current value

set

public final void set(int i,
                      long newValue)

Sets the element at position i to the given value.

参数:

i - the index

newValue - the new value

lazySet

public final void lazySet(int i,
                          long newValue)

Eventually sets the element at position i to the given value.

参数:

i - the index

newValue - the new value

从以下版本开始:

1.6

getAndSet

public final long getAndSet(int i,
                            long newValue)

Atomically sets the element at position i to the given value and returns the old value.

参数:

i - the index

newValue - the new value

返回:

the previous value

compareAndSet

public final boolean compareAndSet(int i,
                                   long expect,
                                   long update)

Atomically sets the element at position i to the given updated value if the current value == the expected value.

参数:

i - the index

expect - the expected value

update - the new value

返回:

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

weakCompareAndSet

public final boolean weakCompareAndSet(int i,
                                       long expect,
                                       long update)

Atomically sets the element at position i 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.

参数:

i - the index

expect - the expected value

update - the new value

返回:

true if successful

getAndIncrement

public final long getAndIncrement(int i)

Atomically increments by one the element at index i.

参数:

i - the index

返回:

the previous value

getAndDecrement

public final long getAndDecrement(int i)

Atomically decrements by one the element at index i.

参数:

i - the index

返回:

the previous value

getAndAdd

public final long getAndAdd(int i,
                            long delta)

Atomically adds the given value to the element at index i.

参数:

i - the index

delta - the value to add

返回:

the previous value

incrementAndGet

public final long incrementAndGet(int i)

Atomically increments by one the element at index i.

参数:

i - the index

返回:

the updated value

decrementAndGet

public final long decrementAndGet(int i)

Atomically decrements by one the element at index i.

参数:

i - the index

返回:

the updated value

addAndGet

public long addAndGet(int i,
                      long delta)

Atomically adds the given value to the element at index i.

参数:

i - the index

delta - the value to add

返回:

the updated value

getAndUpdate

public final long getAndUpdate(int i,
                               LongUnaryOperator updateFunction)

Atomically updates the element at index i with the results of applying the given function, returning the previous value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads.

参数:

i - the index

updateFunction - a side-effect-free function

返回:

the previous value

从以下版本开始:

1.8

updateAndGet

public final long updateAndGet(int i,
                               LongUnaryOperator updateFunction)

Atomically updates the element at index i with the results of applying the given function, returning the updated value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads.

参数:

i - the index

updateFunction - a side-effect-free function

返回:

the updated value

从以下版本开始:

1.8

getAndAccumulate

public final long getAndAccumulate(int i,
                                   long x,
                                   LongBinaryOperator accumulatorFunction)

Atomically updates the element at index i with the results of applying the given function to the current and given values, returning the previous value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads. The function is applied with the current value at index i as its first argument, and the given update as the second argument.

参数:

i - the index

x - the update value

accumulatorFunction - a side-effect-free function of two arguments

返回:

the previous value

从以下版本开始:

1.8

accumulateAndGet

public final long accumulateAndGet(int i,
                                   long x,
                                   LongBinaryOperator accumulatorFunction)

Atomically updates the element at index i with the results of applying the given function to the current and given values, returning the updated value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads. The function is applied with the current value at index i as its first argument, and the given update as the second argument.

参数:

i - the index

x - the update value

accumulatorFunction - a side-effect-free function of two arguments

返回:

the updated value

从以下版本开始:

1.8

toString

public String toString()

Returns the String representation of the current values of array.

覆盖:

toString 在类中 Object

返回:

the String representation of the current values of array