如果当前值等于作为参数传递的ExpectedValue,则使用AtomicReferenceArray类的weakCompareAndSetVolatile()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VarHandle.weakCompareAndSet(java.lang.Object…)指定的具有 memory 效应的值来更新该值。如果成功将AtomicRefrence设置为新值,则此方法返回true。
用法:
public final boolean weakCompareAndSetVolatile(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weakCompareAndSetVolatile()方法:
程序1:
// Java program to demonstrate AtomicReferenceArray
// weakCompareAndSetVolatile() 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(1, 1234.00);
ref.set(0, 2234.00);
ref.set(2, 3234.00);
// apply weakCompareAndSetVolatile()
boolean result
= ref.weakCompareAndSetVolatile(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
// weakCompareAndSetVolatile() 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, "AMANDIP");
ref.set(1, "AMAN");
// apply weakCompareAndSetVolatile()
boolean result
= ref.weakCompareAndSetVolatile(
0,
"AMARDIP",
"AMAR");
// print value
System.out.println("Setting new value"
+ " is successful = "
+ result);
System.out.println("Value of index 0 = "
+ ref.get(0));
}
}
输出:
相关用法
- Java AtomicReference weakCompareAndSetVolatile()用法及代码示例
- Java AtomicReferenceArray get()用法及代码示例
- Java AtomicReferenceArray set()用法及代码示例
- Java AtomicReferenceArray getAndSet()用法及代码示例
- Java AtomicReferenceArray lazySet()用法及代码示例
- Java AtomicReferenceArray getPlain()用法及代码示例
- Java AtomicReferenceArray getOpaque()用法及代码示例
- Java AtomicReferenceArray toString()用法及代码示例
- Java AtomicReferenceArray length()用法及代码示例
- Java AtomicReferenceArray updateAndGet()用法及代码示例
- Java AtomicReferenceArray compareAndExchangeAcquire()用法及代码示例
- Java AtomicReferenceArray accumulateAndGet()用法及代码示例
- Java AtomicReferenceArray compareAndSet()用法及代码示例
- Java AtomicReferenceArray getAcquire()用法及代码示例
- Java AtomicReferenceArray compareAndExchangeRelease()用法及代码示例
注:本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 AtomicReferenceArray weakCompareAndSetVolatile() 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。