java.DoubleAdder.sumThenReset()是Java中的一種內置方法,等效於sum(),然後是reset()方法,該方法首先計算有效和,然後重置該值以保持零值。創建類的對象時,其初始值為零。
用法:
public double sumThenReset()
參數:此方法不接受任何參數。
返回值:該方法返回總和。
以下示例程序旨在說明上述方法:
程序1:
// Program to demonstrate the sumThenReset() method
import java.lang.*;
import java.util.concurrent.atomic.DoubleAdder;
public class GFG {
public static void main(String args[])
{
DoubleAdder num = new DoubleAdder();
// add operation on num
num.add(42);
num.add(10);
// sum operation on num
num.sum();
// Print after sum operation
System.out.println(" the value after sum is: " + num);
// sumThenReset operation on variable num
num.sumThenReset();
// Print after sumThenReset operation
System.out.println("the current value is: " + num);
}
}
輸出:
the value after sum is: 52.0 the current value is: 0.0
程序2:
// Program to demonstrate the sumThenReset() method
import java.lang.*;
import java.util.concurrent.atomic.DoubleAdder;
public class GFG {
public static void main(String args[])
{
DoubleAdder num = new DoubleAdder();
// add operation on num
num.add(254);
// sum operation on num
num.sum();
// Print after sum operation
System.out.println(" the value after sum is: " + num);
// sumThenReset operation on variable num
num.sumThenReset();
// Print after sumThenReset operation
System.out.println("the current value is: " + num);
}
}
輸出:
the value after sum is: 254.0 the current value is: 0.0
參考: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/DoubleAdder.html#sumThenReset–
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