如果当前值等于作为参数传递的ExpectedValue,则使用AtomicReferenceArray类的weakCompareAndSet()方法以原子方式将AtomicReferenceArray的索引i处的元素值设置为newValue到newValue。此方法使用读取的内存语义更新索引i的值,就好像该变量被声明为变量的易失性类型一样。如果成功将AtomicReference设置为新值,则此方法返回true。
用法:
public final boolean weakCompareAndSet( int i, E expectedValue, E newValue)
参数:此方法接受:
- i这是执行操作的AtomicReferenceArray的索引,
- expectedValue 这是期望值,
- newValue 这是要设置的新值。
返回值:如果成功将AtomicReference设置为新值,则此方法返回true。
以下示例程序旨在说明weakCompareAndSet()方法:
程序1:
// Java program to demonstrate
// weakCompareAndSet() method
import java.util.concurrent.atomic.*;
public class GFG {
public static void main(String[] args)
{
// create an atomic reference object.
AtomicReferenceArray<Integer> ref
= new AtomicReferenceArray<Integer>(5);
// set some value
ref.set(0, 543);
ref.set(1, 124);
ref.set(2, 322);
// apply weakCompareAndSet()
boolean result
= ref.weakCompareAndSet(0, 124,
234);
// print value
System.out.println("Setting new value"
+ " is successful = "
+ result);
System.out.println("Value of index 0 = "
+ ref.get(0));
}
}
输出:
Setting new value is successful = false Value of index 0 = 543
程序2:
// Java program to demonstrate
// weakCompareAndSet() method
import java.util.concurrent.atomic.*;
public class GFG {
public static void main(String[] args)
{
// create an atomic reference object.c
AtomicReferenceArray<String> ref
= new AtomicReferenceArray<String>(5);
// set some value
ref.set(0, "INDIA");
ref.set(1, "US");
ref.set(2, "UK");
ref.set(3, "CHINA");
ref.set(4, "CHINA");
// apply weakCompareAndSet()
boolean result
= ref.weakCompareAndSet(4, "CHINA",
"CANADA");
// print value
System.out.println("Setting new value"
+ " is successful = "
+ result);
System.out.println("Value of index 4 = "
+ ref.get(4));
}
}
输出:
Setting new value is successful = true Value of index 4 = CANADA
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注:本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 AtomicReferenceArray weakCompareAndSet() 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。