Java DoubleSummaryStatistics combine()用法及代碼示例

Java中DoubleSummaryStatistics類的combine()方法用於將給定的其他DoubleSummaryStatistics與此DoubleSummaryStatistics組合。

用法:

public void combine(DoubleSummaryStatistics 
                otherDoubleSummaryStatistics)

參數：此方法接受otherDoubleSummaryStatistics作為要組合到此DoubleSummaryStatistics中的參數。

返回值：此方法不返回任何內容。

異常：如果otherDoubleSummaryStatistics為null，則此方法引發NullPointerException。

程序：

// Java program to demonstrate 
// the above method 
  
import java.util.*; 
  
public class DoubleSummaryStatisticsDemo { 
    public static void main(String[] args) 
    { 
  
        DoubleSummaryStatistics doubleSummaryStatistics 
            = new DoubleSummaryStatistics(); 
  
        List<Double> list = new LinkedList<>(); 
        list.add(95.7); 
        list.add(234.6767); 
        list.add(243.5); 
        list.add(50.0); 
        list.add(45.6); 
  
        Iterator<Double> iterator = list.listIterator(); 
        while (iterator.hasNext()) { 
  
            // Add the doubles to the 
            // DoubleSummaryStatistics object 
            doubleSummaryStatistics 
                .accept(iterator.next()); 
        } 
  
        System.out.println("First DdoubleSummaryStatistics: "
                           + doubleSummaryStatistics 
                                 .toString()); 
  
        DoubleSummaryStatistics otherDoubleSummaryStatistics 
            = new DoubleSummaryStatistics(); 
  
        List<Double> list1 = new LinkedList<>(); 
        list1.add(45664.0); 
        list1.add(7007.777); 
        list1.add(5677.0); 
        list1.add(0.0); 
        list1.add(45664.7); 
  
        Iterator<Double> iterator1 = list1.listIterator(); 
        while (iterator1.hasNext()) { 
  
            // Add the doubles to the 
            // DoubleSummaryStatistics object 
            otherDoubleSummaryStatistics 
                .accept(iterator1.next()); 
        } 
  
        System.out.println("Second DdoubleSummaryStatistics: "
                           + otherDoubleSummaryStatistics 
                                 .toString()); 
  
        System.out.println("Combining both DdoubleSummaryStatistics"
                           + " using combine() "); 
        doubleSummaryStatistics.combine(otherDoubleSummaryStatistics); 
  
        System.out.println("Combined DdoubleSummaryStatistics: "
                           + doubleSummaryStatistics.toString()); 
    } 
}

輸出：

First DdoubleSummaryStatistics:
DoubleSummaryStatistics{count=5, sum=669.476700, min=45.600000, average=133.895340, max=243.500000}
Second DdoubleSummaryStatistics:
DoubleSummaryStatistics{count=5, sum=104013.477000, min=0.000000, average=20802.695400, max=45664.700000}

Combining both DdoubleSummaryStatistics using combine()

Combined DdoubleSummaryStatistics:
DoubleSummaryStatistics{count=10, sum=104682.953700, min=0.000000, average=10468.295370, max=45664.700000}

參考： https://docs.oracle.com/javase/9/docs/api/java/util/DoubleSummaryStatistics.html#combine-java.util.DoubleSummaryStatistics-

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注：本文由純淨天空篩選整理自ShubhamMaurya3大神的英文原創作品 DoubleSummaryStatistics combine() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。