AtomicReferenceArray类的getAndAccumulate()方法用于原子更新AtomicReferenceArray索引i处的元素,并将给定的accumulatorFunction应用于当前值和给定值,并返回前一个值。 accumulatorFunction应该没有副作用,因为当尝试更新由于线程之间的争用而失败时,可能会重新应用accumulatorFunction。应用该函数时,将索引i处的当前值作为其第一个参数,并将给定的update作为第二个参数。
用法:
public final E getAndAccumulate(int i, E x, BinaryOperator<E> accumulatorFunction)
参数:此方法接受:
- i这是执行操作所接受的AtomicReferenceArray的索引,
- x这是更新的值,
- accumulatorFunction这是两个参数的无副作用函数。
返回值:此方法返回前一个值。
以下示例程序旨在说明getAndAccumulate()方法:
程序1:
// Java program to demonstrate
// getAndAccumulate() method
import java.util.concurrent.atomic.*;
import java.util.function.BinaryOperator;
public class GFG {
public static void main(String args[])
{
// an array
Integer a[]
= { 123, 1232, 1433, 134, 13415, 1343 };
// AtomicReferenceArray with array
AtomicReferenceArray<Integer> array
= new AtomicReferenceArray<>(a);
// Print AtomicReferenceArray
System.out.println(
"The AtomicReferenceArray before update:"
+ array);
// Index and Value to apply getAndAccumulate
int index = 2;
int E = 3;
// Declaring the accumulatorFunction
// applying function
BinaryOperator add
= (u, v)
-> Integer.parseInt(
u.toString())
* Integer
.parseInt(
v.toString());
// apply getAndAccumulate()
int value
= array.getAndAccumulate(index, E, add);
// print AtomicReferenceArray
System.out.println(
"previous value of index 2:"
+ value);
System.out.println(
"The AtomicReferenceArray after update:"
+ array);
}
}
输出:
程序2:
// Java program to demonstrate
// getAndAccumulate() method
import java.util.concurrent.atomic.*;
import java.util.function.BinaryOperator;
public class GFG {
public static void main(String args[])
{
// an array
String a[] = { "GFG", "JS" };
// AtomicReferenceArray with array
AtomicReferenceArray<String> array
= new AtomicReferenceArray<>(a);
// Print AtomicReferenceArray
System.out.println(
"The AtomicReferenceArray before update:"
+ array);
// Index and Value to apply getAndAccumulate
int index = 1;
String E = " PYTHON";
// Declaring the accumulatorFunction
// applying function to add value as string
BinaryOperator add
= (u, v) -> u.toString() + " and " + v.toString();
// apply getAndAccumulate()
String value
= array.getAndAccumulate(index, E, add);
// print AtomicReferenceArray
System.out.println(
"previous value of index 1:"
+ value);
System.out.println(
"The AtomicReferenceArray after update:"
+ array);
}
}
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 getAndAccumulate() 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。