如果当前值等于作为参数传递的ExpectedValue,则使用AtomicReferenceArray类的weakCompareAndSetAcquire()方法以原子方式将AtomicReferenceArray的索引i处的元素值设置为newValue到newValue。此方法使用与memory_order_acquire排序兼容的内存排序效果来更新索引i处的值。如果成功将AtomicRefrence设置为新值,则此方法返回true。
用法:
public final boolean weakCompareAndSetAcquire( 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AtomicRefrence设置为新值,则此方法返回true。
以下示例程序旨在说明weakCompareAndSetAcquire()方法:
程序1:
// Java program to demonstrate
// weakCompareAndSetAcquire() 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, 123);
ref.set(2, 5443);
// apply weakCompareAndSetAcquire()
boolean result
= ref.weakCompareAndSetAcquire(
0,
5443,
234);
// print value
System.out.println(
"Setting new value"
+ " is successful = "
+ result);
System.out.println("Value of index 0 = "
+ ref.get(0));
}
}
输出:
程序2:
// Java program to demonstrate
// weakCompareAndSetAcquire() method
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, "C");
ref.set(1, "PYTHON");
ref.set(2, "TS");
ref.set(3, "C++");
ref.set(4, "C");
// apply weakCompareAndSetAcquire()
boolean result
= ref.weakCompareAndSetAcquire(
4,
"C",
"JAVA");
// print value
System.out.println(
"Setting new value"
+ " is successful = "
+ result);
System.out.println(
"Value of index 4 = "
+ ref.get(4));
}
}
输出:
相关用法
- Java AtomicReference weakCompareAndSetAcquire()用法及代码示例
- Java AtomicReferenceArray set()用法及代码示例
- Java AtomicReferenceArray get()用法及代码示例
- Java AtomicReferenceArray getPlain()用法及代码示例
- Java AtomicReferenceArray length()用法及代码示例
- Java AtomicReferenceArray getAndSet()用法及代码示例
- Java AtomicReferenceArray setPlain()用法及代码示例
- Java AtomicReferenceArray compareAndExchangeRelease()用法及代码示例
- Java AtomicReferenceArray lazySet()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 compareAndExchangeAcquire()用法及代码示例
- Java AtomicReferenceArray compareAndExchange()用法及代码示例
- Java AtomicReferenceArray compareAndSet()用法及代码示例
- Java AtomicReferenceArray getAndAccumulate()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 weakCompareAndSetAcquire() 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。