Java AtomicLong getAndSet()用法及代码示例

Java.util.concurrent.atomic.AtomicLong.getAndSet()是Java中的一种内置方法，该方法将给定值设置为参数中传递的值，并在更新之前返回该值，该值数据类型是long。

用法:

public final long getAndSet(long val)

参数：该函数接受单个强制参数val，该参数指定要更新的值。

返回值：函数将执行更新运算之前的值返回。

以下示例程序旨在说明上述方法：

示例1:

// Java program that demonstrates 
// the getAndSet() function 
  
import java.util.concurrent.atomic.AtomicLong; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
  
        // Initially value as 0 
        AtomicLong val = new AtomicLong(0); 
  
        // Updates and sets 
        long res 
            = val.getAndSet(10); 
  
        System.out.println("Previous value: "
                           + res); 
  
        // Prints the updated value 
        System.out.println("Current value: "
                           + val); 
    } 
}

输出：

Previous value: 0
Current value: 10

示例2:

// Java program that demonstrates 
// the getAndSet() function 
  
import java.util.concurrent.atomic.AtomicLong; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
  
        // Initially value as 18 
        AtomicLong val = new AtomicLong(18); 
  
        // Gets and updates 
        long res = val.getAndSet(12); 
  
        System.out.println("Previous value: "
                           + res); 
        // Prints the updated value 
        System.out.println("Current value: "
                           + val); 
    } 
}

输出：

Previous value: 18
Current value: 12

参考： https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLong.html#getAndSet–

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注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 AtomicLong getAndSet() 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。