Package java.util.concurrent.atomic

Class AtomicIntegerArray

java.lang.Object
java.util.concurrent.atomic.AtomicIntegerArray
All Implemented Interfaces:
Serializable
public class AtomicIntegerArray
extends Object
implements Serializable
An int array in which elements may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables.
Since:
1.5
Author:
Doug Lea
See Also:
Serialized Form

  • Constructor Summary

    Constructors
    Constructor Description
    AtomicIntegerArray​(int length)
    Creates a new AtomicIntegerArray of the given length, with all elements initially zero.
    AtomicIntegerArray​(int[] array)
    Creates a new AtomicIntegerArray with the same length as, and all elements copied from, the given array.

  • Method Summary

    Modifier and Type Method Description
    int addAndGet​(int i, int delta)
    Atomically adds the given value to the element at index i.
    boolean compareAndSet​(int i, int expect, int update)
    Atomically sets the element at position i to the given updated value if the current value == the expected value.
    int decrementAndGet​(int i)
    Atomically decrements by one the element at index i.
    int get​(int i)
    Gets the current value at position i.
    int getAndAdd​(int i, int delta)
    Atomically adds the given value to the element at index i.
    int getAndDecrement​(int i)
    Atomically decrements by one the element at index i.
    int getAndIncrement​(int i)
    Atomically increments by one the element at index i.
    int getAndSet​(int i, int newValue)
    Atomically sets the element at position i to the given value and returns the old value.
    int incrementAndGet​(int i)
    Atomically increments by one the element at index i.
    void lazySet​(int i, int newValue)
    Eventually sets the element at position i to the given value.
    int length()
    Returns the length of the array.
    void set​(int i, int newValue)
    Sets the element at position i to the given value.
    String toString()
    Returns the String representation of the current values of array.
    boolean weakCompareAndSet​(int i, int expect, int update)
    Atomically sets the element at position i to the given updated value if the current value == the expected value.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • AtomicIntegerArray

      public AtomicIntegerArray​(int length)
      Creates a new AtomicIntegerArray of the given length, with all elements initially zero.
      Parameters:
      length - the length of the array

    • AtomicIntegerArray

      public AtomicIntegerArray​(int[] array)
      Creates a new AtomicIntegerArray with the same length as, and all elements copied from, the given array.
      Parameters:
      array - the array to copy elements from
      Throws:
      NullPointerException - if array is null

  • Method Details

    • length

      public final int length()
      Returns the length of the array.
      Returns:
      the length of the array

    • get

      public final int get​(int i)
      Gets the current value at position i.
      Parameters:
      i - the index
      Returns:
      the current value

    • set

      public final void set​(int i, int newValue)
      Sets the element at position i to the given value.
      Parameters:
      i - the index
      newValue - the new value

    • lazySet

      public final void lazySet​(int i, int newValue)
      Eventually sets the element at position i to the given value.
      Parameters:
      i - the index
      newValue - the new value
      Since:
      1.6

    • getAndSet

      public final int getAndSet​(int i, int newValue)
      Atomically sets the element at position i to the given value and returns the old value.
      Parameters:
      i - the index
      newValue - the new value
      Returns:
      the previous value

    • compareAndSet

      public final boolean compareAndSet​(int i, int expect, int update)
      Atomically sets the element at position i to the given updated value if the current value == the expected value.
      Parameters:
      i - the index
      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.

    • weakCompareAndSet

      public final boolean weakCompareAndSet​(int i, int expect, int 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.

      Parameters:
      i - the index
      expect - the expected value
      update - the new value
      Returns:
      true if successful

    • getAndIncrement

      public final int getAndIncrement​(int i)
      Atomically increments by one the element at index i.
      Parameters:
      i - the index
      Returns:
      the previous value

    • getAndDecrement

      public final int getAndDecrement​(int i)
      Atomically decrements by one the element at index i.
      Parameters:
      i - the index
      Returns:
      the previous value

    • getAndAdd

      public final int getAndAdd​(int i, int delta)
      Atomically adds the given value to the element at index i.
      Parameters:
      i - the index
      delta - the value to add
      Returns:
      the previous value

    • incrementAndGet

      public final int incrementAndGet​(int i)
      Atomically increments by one the element at index i.
      Parameters:
      i - the index
      Returns:
      the updated value

    • decrementAndGet

      public final int decrementAndGet​(int i)
      Atomically decrements by one the element at index i.
      Parameters:
      i - the index
      Returns:
      the updated value

    • addAndGet

      public final int addAndGet​(int i, int delta)
      Atomically adds the given value to the element at index i.
      Parameters:
      i - the index
      delta - the value to add
      Returns:
      the updated value

    • toString

      public String toString()
      Returns the String representation of the current values of array.
      Overrides:
      toString in class Object
      Returns:
      the String representation of the current values of array