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public class Solution { public static void main(String[] args) throws Exception { //在此编写你的代码 ArrayList<String>list=new ArrayList<String>(); Collections.addAll(list,"山姆","我","是"); for (int i = 1 ; i <=5;i+=2) list.add(i,"火腿"); for (String s : list){ System.out.println(s); } } }

public class Solution { public static void main(String[] args) throws Exception { //在此编写你的代码 ArrayList<String> stringArray=new ArrayList<>(); Collections.addAll(stringArray,"山姆","我","是"); int len=2*stringArray.size(); for(int i=1;i<len;i+=2){ stringArray.add(i,"火腿"); } for(String s:stringArray){ System.out.println(s); } } } 我这样写兼容性更强

public class Solution { public static void main(String[] args) throws Exception { ArrayList<String> arr = new ArrayList<String>(); arr.add("山姆"); arr.add("我"); arr.add("是"); int shan = arr.indexOf("山姆"); arr.add(shan + 1,"火腿"); int wo = arr.indexOf("我"); arr.add(wo + 1,"火腿"); int shi = arr.indexOf("是"); arr.add(shi + 1,"火腿"); for(int i = 0; i < arr.size();i++){ System.out.println(arr.get(i)); } } }

import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.*; /* 又见“我是山姆” */ public class Solution { public static void main(String[] args) throws Exception { //在此编写你的代码 ArrayList<String> list = new ArrayList<>(); Collections.addAll(list,"山姆","我","是"); for (int i = 1 ; i <=5;i=i+2) list.add(i,"火腿"); for (String s : list) System.out.println(s); } }