如果AtomicReferenceArray对象的索引i处的当前值等于期望值,则使用AtomicReferenceArray类的compareAndSet()方法原子地将AtomicReferenceArray的索引i的值设置为newValue。如果更新成功,则此方法将返回true。
用法:
public final boolean compareAndSet( 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,则此方法返回true;如果返回false,则表明实际值不等于期望值。
以下示例程序旨在说明compareAndSet()方法:
程序1:
// Java program to demonstrate
// compareAndSet() 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 compareAndSet()
boolean op1
= ref.compareAndSet(0, 5434, 8913);
boolean op2
= ref.compareAndSet(1, 3236, 6543);
// print
System.out.println("Operation at index 0:"
+ op1);
System.out.println("Operation at index 0:"
+ op2);
}
}
输出:
Operation at index 0:false Operation at index 0:false
程序2:
// Java program to demonstrate
// compareAndSet() 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 compareAndSet()
boolean op1
= ref.compareAndSet(
0, "GFG",
"GEEKS FOR GEEKS");
boolean op2
= ref.compareAndSet(
1, "JS",
"JAVA SCRIPT");
// print
System.out.println("Operation at index 0:"
+ op1);
System.out.println("New value at index 0:"
+ ref.get(0));
System.out.println("Operation at index 1:"
+ op2);
System.out.println("New value at index 1:"
+ ref.get(1));
}
}
输出:
Operation at index 0:true New value at index 0:GEEKS FOR GEEKS Operation at index 1:true New value at index 1:JAVA SCRIPT
相关用法
- Java AtomicIntegerArray compareAndSet()用法及代码示例
- Java AtomicReference compareAndSet()用法及代码示例
- Java AtomicInteger compareAndSet()用法及代码示例
- Java AtomicBoolean compareAndSet()用法及代码示例
- Java AtomicLongArray compareAndSet()用法及代码示例
- Java AtomicLong compareAndSet()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 getAndAccumulate()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 accumulateAndGet()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
注:本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 AtomicReferenceArray compareAndSet() 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。