面试题

package com.atguigu.exercise;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
/**
 * @author Dxkstart
 * @create 2021-05-20 19:20
 */
public class ListExer {
    /*
    区分list中remove(int index) 和 remove(Object obj)
     */
    @Test
    public void testListRemove(){
        List list = new ArrayList();
        list.add(1);
        list.add(2);
        list.add("MM");
        updateList(list);
//        System.out.println(list);//[1,2]
        for(int i = 0;i < list.size();i++){
            System.out.println(list.get(i));//1,2
        }
    }
    private static void updateList(List list) {
        list.remove(2);//这删的是索引位置是2的数据
//        list.remove(new Integer(2));//这删的是数据"2"
    }
}