2021-05-08

import java.util.ArrayList;
import java.util.LinkedList;

public class Cao1 {
public static void main(String[] args) {
String[] str = new String[]{"1e21", "12p", "aqwdfq"};

    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;

//数组内元素的删除与修改
ArrayList<String>List =new ArrayList<>();
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);

    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");
    }
}

}