Java LongAccumulator getThenReset()用法及代码示例

java.LongAccumulator.getThenReset()是Java中的一种内置方法，等效于get()，然后是reset()。首先，它获取当前值，然后重置该值。

用法:

public long getThenReset()

参数：此方法不接受任何参数。

返回值：此方法返回复位前的值。

以下示例程序旨在说明上述方法：

程序1：

// Program to demonstrate the getThenReset() method 
  
import java.lang.*; 
import java.util.concurrent.atomic.LongAccumulator; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
        LongAccumulator num = new LongAccumulator(Long::sum, 0L); 
  
        // accumulate operation on num 
        num.accumulate(42); 
        num.accumulate(10); 
  
        num.get(); 
        // before getThenReset the value is 
        System.out.println(" the old value is: " + num); 
        ; 
  
        // getThenResets current value 
        num.getThenReset(); 
  
        // Print after getThenReset operation 
        System.out.println(" the current value is: " + num); 
    } 
}

输出：

the old value is: 52
 the current value is: 0

程序2：

// Program to demonstrate the getThenReset() method 
  
import java.lang.*; 
import java.util.concurrent.atomic.LongAccumulator; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
        LongAccumulator num = new LongAccumulator(Long::sum, 0L); 
  
        // accumulate operation on num 
        num.accumulate(2); 
        num.accumulate(1); 
  
        num.get(); 
        // before getThenReset the value is 
        System.out.println(" the old value is: " + num); 
          
  
        // getThenResets current value 
        num.getThenReset(); 
  
        // Print after getThenReset operation 
        System.out.println(" the current value is: " + num); 
    } 
}

输出：

the old value is: 3
the current value is: 0

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

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注：本文由纯净天空筛选整理自Twinkl Bajaj大神的英文原创作品 LongAccumulator getThenReset() 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。