Java 汇总通用ArrayList中的数字

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import java.util.ArrayList;

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/**

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**/

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public class Main

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{

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   public static void main(String[] args) 

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   {

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      Number[] numbers = {1, 2.4, 3, 4.1}; // Integers and Doubles

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      ArrayList<Number> numberList = new ArrayList<>();

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      for (Number element : numbers) 

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         numberList.add(element); // place each number in numberList

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      System.out.printf("numberList contains: %s%n", numberList);

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      System.out.printf("Total of the elements in numberList: %.1f%n", 

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         sum(numberList));

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   }

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   // calculate total of ArrayList elements

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   public static double sum(ArrayList<Number> list)

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   {

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      double total = 0; // initialize total

      /**

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