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");
}
}
}
