Java 通配符测试程序。

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import java.util.ArrayList;

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public class Main 

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{// 来自 nowjava

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   public static void main(String[] args) 

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   {

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      Integer[] integers = {1, 2, 3, 4, 5};

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      ArrayList<Integer> integerList = new ArrayList<>();

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      // insert elements in integerList

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      for (Integer element : integers)

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         integerList.add(element);

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

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      System.out.printf("Total of the elements in integerList: %.0f%n%n",

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         sum(integerList));

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      // create, initialize and output ArrayList of Doubles, then 

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      // display total of the elements 

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      Double[] doubles = {1.1, 3.3, 5.5};/** from 时代Java**/

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      ArrayList<Double> doubleList = new ArrayList<>();

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      // insert elements in doubleList

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      for (Double element : doubles)

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         doubleList.add(element);

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

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

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         sum(doubleList));

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      // create, initialize and output ArrayList of Numbers containing 

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      // both Integers and Doubles, then display total of the elements 

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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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      // insert elements in numberList

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      for (Number element : numbers)

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         numberList.add(element);

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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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