list往指定的下標插入元素

import java.util.*;
public class ListExample{
    public static void main(String[] args){
        ArrayList<String> al=new ArrayList<String>();
        al.add("Amit");
        al.add("Vijay");
        al.add("Kumar");
        al.add(1,"Sachin");  // list往指定的下標插入元素
        System.out.println("Element at 2nd position: "+al.get(2));
        for(String s:al){
            System.out.println(s);
        }
    }
}
 

Element at 2nd position: Vijay
Amit
Sachin
Vijay
Kumar

list往指定的下標插入元素