Java 中的 AtomicReferenceArray getAndSet()方法，示例
原文:https://www . geeksforgeeks . org/atomicreferencearray-getandset-method-in-Java-with-examples/
一个 AtomicReferenceArray 类的 getAndSet() 方法用于将 AtomicReferenceArray 对象的索引 I 的值原子地设置为 newValue，new value 作为参数传递，并返回 AtomicReferenceArray 对象的旧值，内存效果由 varhandle . getAndSet(Java . lang . object…)指定，varhandle . getAndSet(Java . lang . object…)指定该变量作为内存语义进行处理，就像该变量被声明为 volatile 一样。
语法:
public final E getAndSet(int i, E newValue)
参数:该方法接受:
- i 是执行操作的原子引用数组的索引，
- 新值是要设置的新值。
返回值:此方法返回索引 I 的旧值。 下面的程序说明了 getAndSet()方法: 程序 1:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// AtomicReferenceArray.getAndSet() 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>(3);
// set some value
ref.set(0, 1234);
ref.set(1, 4322);
// apply getAndSet()
int oldV1 = ref.getAndSet(0, 8913);
int oldV2 = ref.getAndSet(1, 6543);
// print
System.out.println("Old value at index 0: "
+ oldV1);
System.out.println("New value at index 0: "
+ ref.get(0));
System.out.println("Old value at index 1: "
+ oldV2);
System.out.println("New value at index 1: "
+ ref.get(1));
}
}
Output:
Old value at index 0: 1234
New value at index 0: 8913
Old value at index 1: 4322
New value at index 1: 6543
程序 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// AtomicReferenceArray.getAndSet() method
import java.util.concurrent.atomic.*;
public class GFG {
public static void main(String[] args)
{
// create an atomic reference object.
AtomicReferenceArray<String> ref
= new AtomicReferenceArray<String>(3);
// set some value
ref.set(0, "GFG");
ref.set(1, "JS");
// apply getAndSet()
String oldV1
= ref.getAndSet(0, "GEEKS FOR GEEKS");
String oldV2
= ref.getAndSet(1, "JAVA SCRIPT");
// print
System.out.println(
"Old value at index 0: "
+ oldV1);
System.out.println(
"New value at index 0: "
+ ref.get(0));
System.out.println(
"Old value at index 1: "
+ oldV2);
System.out.println(
"New value at index 1: "
+ ref.get(1));
}
}
Output:
Old value at index 0: GFG
New value at index 0: GEEKS FOR GEEKS
Old value at index 1: JS
New value at index 1: JAVA SCRIPT
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