将ArrayList转换为排序集(TreeSet)并将其返回 [英] Converts ArrayList into a sorted set (TreeSet) and returns it

问题描述

是一种方法，该方法接受一个数字列表(例如ArrayList)并将其转换为排序的集合(例如TreeSet)并返回它.我写了代码，但是遇到了一些问题.

I a method that takes a list of numbers (e.g. ArrayList) and converts it into a sorted set (e.g. TreeSet) and returns it. I wrote code, but I'm having some problems.

public TreeSet getSort (ArrayList list){
   TreeSet set =new TreeSet(list);
    return set;

我的问题出在主要方面:

My problem is in main:

ArrayList List = new ArrayList();
    List.add(5);
    List.add(55);
    List.add(88);
    List.add(555);
    List.add(154);
    System.out.println("the TreeSet of ArrayList is : " + getSort(List));

推荐答案

您需要具有类实例才能调用getSort()方法或将getSort()设置为static

You need to have the class instance to call the getSort() method or make the getSort() to static

喜欢

System.out.println("the TreeSet of ArrayList is : "+ new classname().getSort(List));

或将方法设为静态

    public static TreeSet getSort (ArrayList list){
       TreeSet set =new TreeSet(list);
        return set;
         }

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