java中Integer类型的集合数据相加答:import java.util.ArrayList;import java.util.List;public class Demo { public static void main(String[] args) { int[] arr = {2,5,4,0,1,8,4,2,3,4,8,12}; List<Integer> list = new ArrayList<Integer>(); int sum = 0; for(int i = 0; i < arr.length...