Java AtomicReferenceArray weakCompareAndSetRelease()用法及代码示例

如果当前值等于作为参数传递的ExpectedValue，则使用AtomicReferenceArray类的weakCompareAndSetRelease()方法以原子方式将AtomicReferenceArray的索引i处的元素值设置为newValue到newValue。此方法将更新值，并确保在此访问后不会对先前的加载和存储进行重新排序。如果成功将AtomicRefrence设置为新值，则此方法返回true。

用法:

public final boolean
       weakCompareAndSetRelease(int i,
                                E expectedValue,
                                E newValue)

参数：此方法接受i(它是AtomicReferenceArray的索引)来执行操作，ExpectedValue是期望值，而newValue是要设置的新值。

返回值：如果成功，则此方法返回true。

以下示例程序旨在说明weakCompareAndSetRelease()方法：
程序1:

// Java program to demonstrate AtomicReferenceArray 
// weakCompareAndSetRelease() method 
  
import java.util.concurrent.atomic.AtomicReferenceArray; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create an atomic reference object. 
        AtomicReferenceArray<Double> ref 
            = new AtomicReferenceArray<Double>(5); 
  
        // set some value 
        ref.set(0, 321.00); 
        ref.set(1, 123.00); 
        ref.set(2, 322.00); 
  
        // apply weakCompareAndSetRelease() 
        boolean result 
            = ref.weakCompareAndSetRelease( 
                1, 
                124.00, 
                234.32); 
  
        // print value 
        System.out.println("Setting new value"
                           + " is successful = "
                           + result); 
  
        System.out.println("Value of index 1 = "
                           + ref.get(1)); 
    } 
}

输出：

程序2:

// Java program to demonstrate AtomicReferenceArray 
// weakCompareAndSetRelease() method 
  
import java.util.concurrent.atomic.AtomicReferenceArray; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create an atomic reference object. 
        AtomicReferenceArray<String> ref 
            = new AtomicReferenceArray<String>(5); 
  
        // set some value 
        ref.set(0, "GFG"); 
        ref.set(1, "JAVA"); 
  
        // apply weakCompareAndSetVolatile() 
        boolean result 
            = ref.weakCompareAndSetVolatile( 
                0, "GFG", 
                "PYTHON"); 
  
        // print value 
        System.out.println("Setting new value"
                           + " is successful = "
                           + result); 
  
        System.out.println("Value of index 0 = "
                           + ref.get(0)); 
    } 
}

输出：

参考文献： https://docs.oracle.com/javase/10/docs/api/java/util/concurrent/atomic/AtomicReferenceArray.html#weakCompareAndSetRelease(V, V)

相关用法

注：本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 AtomicReferenceArray weakCompareAndSetRelease() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。