java - 在 ArrayList 中使用 CompareTo

Question

我需要一些在 ArrayList 中使用 CompareTo 的帮助。作为指导，我得到了这一段:

addOrder(ArrayList words, String newWord) – this method adds newWord in the proper alphabetical order.

Hint you can use: x.compareTo(y)

If x.compareTo(y) is < 0, x comes before y)

addOrder should then return this updated ArrayList of Strings.

但即使我进行了大量研究，仍然很难理解如何将其应用到 ArrayLists。这是我想要使用compareTo方法的代码:

import java.util.ArrayList;
import java.util.ArrayList;
import java.util.List;

class StringList {
    public static void main(String [] args)
    {
        ArrayList< String> list = new ArrayList< String>();
        list.add("Goldsmiths");
        list.add("College");
        list.add("London");
        list.add("Manchester");
        list.add("London");
        list.add("York");
        System.out.println("These are your words:");
        System.out.println(list);
        System.out.println("This is the size of the array:");
        System.out.println(lengthArray(list));
        System.out.println("The length of all strings is:");
        System.out.println(totalLengthArray(list));
    }

    public static int lengthArray(List<String> list)
    {
        return list.size();
    }

    public static int totalLengthArray(List<String> list)
    {
        int count = 0;
        for (String s: list)
        {
            count += s.length();
        }
        return count;
    }
}

我想比较和整理我添加的列表项，您可以在我的代码中看到它们。

Answer 1

使用 Collections.sort(List<T> list, Comparator<T> c);

Collections.sort(yourList,new Comparator<String>() {
    @Override
    public int compare(String lhs, String rhs) {
        return lhs.compareTo(rhs);   //or whatever your sorting algorithm
    }
});