摘要: 1.键找值 keySet() 点击查看代码 public class MapDemo2 { public static void main(String[] args) { //Map集合中的第一种遍历方式 //键找值 Map<String, String> m = new HashMap<>(); 阅读全文
posted @ 2025-09-06 14:50 lachii 阅读(3) 评论(0) 推荐(0)
摘要: 点击查看代码 public class Test4 { public static void main(String[] args) { HashMap<String, ArrayList<String>> hm = new HashMap<>(); ArrayList<String> cityLi 阅读全文
posted @ 2025-09-06 14:41 lachii 阅读(2) 评论(0) 推荐(0)
摘要: 点击查看代码 package com.tiheima.a07test; import java.util.ArrayList; import java.util.Collections; import java.util.Random; public class Test3 { public sta 阅读全文
posted @ 2025-09-06 11:07 lachii 阅读(1) 评论(0) 推荐(0)