在Java中删除arraylist中最小的2个元素?

问题描述

我有一个整数数组列表，我需要计算除最小的两个整数外的所有整数的平均值.我一直在尝试不同的方法，但是我想做的就是找到min1，将其删除，然后找到min2，然后将其删除.

I have an arraylist of integers, i need to compute the average of the integers excluding the smallest two integers. I keep trying different ways of doing this but think what I want to do is find min1, remove it and then find min2 then remove that.

public double computeAverageWithoutLowest2()
  {
    ArrayList<Student> newscores = new ArrayList<Student>(scores);
    int newtotalScores=0;
    int newavg=0; 
    int min1 = 0;
    int min2 = 0;

    min1 = newscores.get(0).getScore();

    for (int i = 0; i< newscores.size(); i++)
    {
      if (newscores.get(i).getScore() < min1)
      {
        min1 = newscores.get(i).getScore();
      }
    }

现在我要从阵列列表中删除min1.我显然尝试过newscores.remove(min1);这不起作用.如何找出数组min1中的哪个位置，然后将其删除?

now I want to remove min1 from my arraylist. I have obviously tried newscores.remove(min1); which does not work. How can I figure out what spot in the array min1 is and then delete it?

任何帮助都将非常感谢！

Any help would be great thanks!!

好的，现在在查看注释后，我将代码更改为:

Alright so now after looking at the comments I changed my code to:

ArrayList<Student> newscores = new ArrayList<Student>(scores);
    int newtotalScores=0;
    int newavg=0; 

    int minPos1 = 0;
    int minPos2 = 0;
    int min1 = newscores.get(0).getScore();
    int min2 = newscores.get(0).getScore();

    for(int i = 0; i < newscores.size(); i++) 
    {
      if(newscores.get(i).getScore() < min1) 
      {
        min1 = scores.get(i).getScore();
        minPos1 = i;
      } 
    }
    newscores.remove(minPos1);


    for(int j = 0; j < newscores.size(); j++)
    {
      if(newscores.get(j).getScore() < min2)
      {
        min2 = scores.get(j).getScore();
        minPos2 = j;
      }
    }
    newscores.remove(minPos2);

这种方法可以删除min1，但不能删除min2，而是只删除与min1相同的位置.

This way works to remove min1, but does not work to remove min2 instead it just removes the same position that min1 removed.

推荐答案

为什么不简单地使用 remove ， indexOf 和 min :

Why don't you simply use remove, indexOf and min:

newscores.remove(newscores.indexOf(Collections.min(newscores)));

如果要删除两个最小的项目，请重复两次.

Do it twice if you want to remove the two smallest items.

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