Java DoubleAccumulator getThenReset()方法及示例

Java.DoubleAccumulator.getThenReset() 是java中的一个内置方法，其作用相当于get()和reset()。首先，它得到当前值，然后重置该值。重置后的值为零。其返回类型为int。

语法

public double getThenReset()

参数： 该方法不接受任何参数。

返回值： 该方法返回重置前的值。

下面的程序说明了上述方法。

程序1 :

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

输出:

Old value is: 52.0
Current value is: 0.0

程序2

// Java program to demonstrate
// the getThenReset() method import java.lang.*;
  
import java.util.concurrent.atomic.DoubleAccumulator;
  
public class GFG {
    public static void main(String args[])
    {
  
        DoubleAccumulator num
            = new DoubleAccumulator(
                Double::sum, 0L);
  
        // accumulate operation on num
        num.accumulate(74);
        num.accumulate(1);
  
        num.get();
        // before getThenReset the value is
        System.out.println("Old value is: "
                           + num);
  
        // getThenResets current value
        num.getThenReset();
  
        // Print after getThenReset operation
        System.out.println("Current value is: "
                           + num);
    }
}

输出:

Old value is: 75.0
Current value is: 0.0