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  • Class AtomicInteger

    Java™ Platform
    Standard Ed. 7
    java.util.concurrent.atomic

    Class AtomicInteger

    • 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 Summary

        Constructors 
        Constructor and Description
        AtomicInteger()
        Creates a new AtomicInteger with initial value 0.
        AtomicInteger(int initialValue)
        Creates a new AtomicInteger with the given initial value.
      • Method Summary

        Methods 
        Modifier and TypeMethod and Description
        int addAndGet(int delta)
        Atomically adds the given value to the current value.
        boolean compareAndSet(int expect, int update)
        Atomically sets the value to the given updated value if the current value == the expected value.
        int decrementAndGet()
        Atomically decrements by one the current value.
        double doubleValue()
        Returns the value of the specified number as a double.
        float floatValue()
        Returns the value of the specified number as a float.
        int get()
        Gets the current value.
        int getAndAdd(int delta)
        Atomically adds the given value to the current value.
        int getAndDecrement()
        Atomically decrements by one the current value.
        int getAndIncrement()
        Atomically increments by one the current value.
        int getAndSet(int newValue)
        Atomically sets to the given value and returns the old value.
        int incrementAndGet()
        Atomically increments by one the current value.
        int intValue()
        Returns the value of the specified number as an int.
        void lazySet(int newValue)
        Eventually sets to the given value.
        long longValue()
        Returns the value of the specified number as a long.
        void set(int newValue)
        Sets to the given value.
        String toString()
        Returns the String representation of the current value.
        boolean weakCompareAndSet(int expect, int update)
        Atomically sets the value to the given updated value if the current value == the expected value.
      • 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.
    Java™ Platform
    Standard Ed. 7

    Submit a bug or feature 
    For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
    Copyright © 1993, 2018, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

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  • 原文地址:https://www.cnblogs.com/diggingdeeply/p/Class_AtomicInteger.html
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