package edu.xcdq.list;

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

public class ArrayListDemo01 {
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.print(l +"\t");
    }
    System.out.println();
    for (int i = 0; i < list.size(); i++) {
        System.out.print( list.get(i) +"\t");
    }











}

}