小编Azu*_*bow的帖子

我创建了自己的MyArrayList,但无法对其进行排序.一个普通的Arraylist可以分类,Collections.sort但我的不能.有人可以告诉我哪里错了吗？

import java.util.*;

public class TestMyArrayList
{
    public static void main(String[] args){
        String[] subjects = {"EIE320", "EIE558", "EIE375", "EIE424"};
        Integer[] marks = {90,85,70,80};
        MyArrayList<String> sList = new MyArrayList<String>(subjects);
        Collections.sort(sList);
        sList.print();
        MyArrayList<Integer> mList = new MyArrayList<Integer>(marks);
        Collections.sort(mList);
        mList.print();
    }
}

public class MyArrayList<E> extends ArrayList<E>
    implements List<E>
{    
    private List<E> data;

    public MyArrayList()
    {
    }

    public MyArrayList(E[] inputdata){
        super();
        data = new ArrayList<E>();
        for(E e:inputdata){
            data.add(e);
        }
    }

    public void print(){
        for(Iterator iter = data.iterator();iter.hasNext();){
            System.out.print(iter.next() + " "); …