package com.xcdq;

import java.util.ArrayList;
import java.util.Collection;

public class Demo01 {
    public static void main(String[] args) {
        String [] str = new String[]{"1e21" , "12q" , "aqwdfqw"};
        str[0] = "111";
        str[1] = "222";
        str[2] = "333";
        //删除位置为1的元素
        str[1] = str[2];
        str[2] = null;

        ArrayList<String> List = new ArrayList<>();//数组列表 底层是数组
        List.add("111");
        List.add("222");
        List.add("333");
        List.add("444");
        List.add("555");    //增加
        System.out.println(List);
        List.remove(1); //删除
        List.remove("444");
        System.out.println(List);
        List.set(2,"55555"); //修改
        System.out.println(List);
        // 查询
        for (String L : List){
            System.out.println(L + "\t");
        }
        System.out.println();
        for (int i = 0;i < List.size();i++){
            System.out.println(List.get(i) +"\t");
        }


    }
}