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java.util.concurrent.atomic

Class AtomicInteger

Contents
  • All Implemented Interfaces:
    Serializable

    public class AtomicInteger
extends Number
implements Serializable
    An int value that may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables. An AtomicInteger is used in applications such as atomically incremented counters, and cannot be used as a replacement for an Integer. However, this class does extend Number to allow uniform access by tools and utilities that deal with numerically-based classes.
    Since:
    1.5
    See Also:
    Serialized Form

    • Constructor Detail

      • AtomicInteger

        public AtomicInteger(int initialValue)
        Creates a new AtomicInteger with the given initial value.
        Parameters:
        initialValue - the initial value

      • AtomicInteger

        public AtomicInteger()
        Creates a new AtomicInteger with initial value 0.

    • Method Detail

      • get

        public final int get()
        Gets the current value.
        Returns:
        the current value

      • set

        public final void set(int newValue)
        Sets to the given value.
        Parameters:
        newValue - the new value

      • lazySet

        public final void lazySet(int newValue)
        Eventually sets to the given value.
        Parameters:
        newValue - the new value
        Since:
        1.6

      • getAndSet

        public final int getAndSet(int newValue)
        Atomically sets to the given value and returns the old value.
        Parameters:
        newValue - the new value
        Returns:
        the previous value

      • compareAndSet

        public final boolean compareAndSet(int expect,
                    int update)
        Atomically sets the value to the given updated value if the current value == the expected value.
        Parameters:
        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 expect,
                        int 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:
        expect - the expected value
        update - the new value
        Returns:
        true if successful.

      • getAndIncrement

        public final int getAndIncrement()
        Atomically increments by one the current value.
        Returns:
        the previous value

      • getAndDecrement

        public final int getAndDecrement()
        Atomically decrements by one the current value.
        Returns:
        the previous value

      • getAndAdd

        public final int getAndAdd(int delta)
        Atomically adds the given value to the current value.
        Parameters:
        delta - the value to add
        Returns:
        the previous value

      • incrementAndGet

        public final int incrementAndGet()
        Atomically increments by one the current value.
        Returns:
        the updated value

      • decrementAndGet

        public final int decrementAndGet()
        Atomically decrements by one the current value.
        Returns:
        the updated value

      • addAndGet

        public final int addAndGet(int delta)
        Atomically adds the given value to the current value.
        Parameters:
        delta - the value to add
        Returns:
        the updated 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.

      • intValue

        public int intValue()
        Description copied from class: Number
        Returns the value of the specified number as an int. This may involve rounding or truncation.
        Specified by:
        intValue in class Number
        Returns:
        the numeric value represented by this object after conversion to type int.

      • longValue

        public long longValue()
        Description copied from class: Number
        Returns the value of the specified number as a long. This may involve rounding or truncation.
        Specified by:
        longValue in class Number
        Returns:
        the numeric value represented by this object after conversion to type long.

      • floatValue

        public float floatValue()
        Description copied from class: Number
        Returns the value of the specified number as a float. This may involve rounding.
        Specified by:
        floatValue in class Number
        Returns:
        the numeric value represented by this object after conversion to type float.

      • doubleValue

        public double doubleValue()
        Description copied from class: Number
        Returns the value of the specified number as a double. This may involve rounding.
        Specified by:
        doubleValue in class Number
        Returns:
        the numeric value represented by this object after conversion to type double.
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