如果当前值等于作为参数传递的ExpectedValue,则使用AtomicReferenceArray类的weakCompareAndSetPlain()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set的内存语义更新索引i的值,就像索引i的变量声明为非易失性和非最终值一样。如果成功设置新值,则此方法返回true。
用法:
public final boolean weakCompareAndSetPlain(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weakCompareAndSetPlain()方法:
程序1:
// Java program to demonstrate AtomicReferenceArray
// weakCompareAndSetPlain() method
import java.util.concurrent.atomic.AtomicReferenceArray;
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, 321);
ref.set(1, 123);
ref.set(2, 322);
// apply weakCompareAndSetPlain()
boolean result
= ref.weakCompareAndSetPlain(
0, 124,
234);
// print value
System.out.println("Setting new value"
+ " is successful = "
+ result);
System.out.println("Value of index 0 = "
+ ref.get(1));
}
}
输出:
程序2:
// Java program to demonstrate AtomicReferenceArray
// weakCompareAndSetPlain() method
import java.util.concurrent.atomic.AtomicReferenceArray;
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, "JAVA");
ref.set(2, "JS");
ref.set(3, "C++");
ref.set(4, "C");
// apply weakCompareAndSetVolatile()
boolean result
= ref.weakCompareAndSetVolatile(
4, "C",
"PYTHON");
// print value
System.out.println("Setting new value"
+ " is successful = "
+ result);
System.out.println("Value of index 4 = "
+ ref.get(4));
}
}
输出:
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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 weakCompareAndSetPlain() 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。