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: 52.0Current 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: 75.0Current value is: 0.0