添加ArrayList的连续元素 [英] Adding consecutive elements of ArrayList

问题描述

我正在努力实现以下目标:

I am trying to achieve the following:

给出一个列表{146,7，-2，-1}，编写一个新列表，使其第ith个元素由"i"和"i + 1"之和组成.

Given a list {146,7,-2,-1} write a new list such that its ith element consists of sums of "i" and i+1".

因此，此列表:{146,153,151,150}将被转换为146，例如146 + 7 = 153、153 +(-2)= 151，依此类推. 我写了以下内容:

So this list: {146,153,151,150} would be transformed into 146 as 146+7=153, 153+(-2)=151 and so on. I wrote the following:

List<Integer> list = new ArrayList<Integer>();
List<Integer> list2 = new ArrayList<Integer>();

list2.add(0, list.get(0));

for(int i=0;i<list.size()-1;i++)
{
  list2.add(i+1, list.get(i+1)+list.get(i));
  System.out.println(list2);
}

但是，这将返回{146,153,6，-3}.我在做什么错了?

However, this is returning {146,153,6,-3}. What I am doing wrong?

推荐答案

您应该添加到list2.get(i)而不是list.get(i)

List<Integer> list = new ArrayList<Integer>();
List<Integer> list2 = new ArrayList<Integer>();
list2.add(0, list.get(0));

for(int i=0;i<list.size()-1;i++)
{
    list2.add(i+1, list.get(i+1)+list2.get(i));
    System.out.println(list2);

}

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