将 ArrayList 转换为有序集合(TreeSet)并返回 [英] Converts ArrayList into a sorted set (TreeSet) and returns it

问题描述

我是一个方法，它接受一个数字列表(例如 ArrayList)并将其转换为一个有序集合(例如 TreeSet)并返回它.我写了代码，但我遇到了一些问题.

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;

我的问题主要在于:

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

你需要有类实例来调用getSort()方法或制作getSort() 到 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));

或使方法静态

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

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