From 375c9ab275b69b6c81da3f8edbe11f11b46c6263 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Mon, 3 Aug 2026 10:51:47 +0800
Subject: [PATCH] =?UTF-8?q?s-day04-Map=E7=BB=83=E4=B9=A0=E7=BB=9F=E8=AE=A1?=
 =?UTF-8?q?=E5=AD=97=E7=AC=A6=E5=87=BA=E7=8E=B0=E7=9A=84=E6=AC=A1=E6=95=B0?=
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---
 s-day04/src/com/inmind/map01/MapTest06.java | 57 +++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 s-day04/src/com/inmind/map01/MapTest06.java

diff --git a/s-day04/src/com/inmind/map01/MapTest06.java b/s-day04/src/com/inmind/map01/MapTest06.java
new file mode 100644
index 0000000..44c8510
--- /dev/null
+++ b/s-day04/src/com/inmind/map01/MapTest06.java
@@ -0,0 +1,57 @@
+package com.inmind.map01;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+import java.util.Set;
+
+/*
+7.Map练习统计字符串中字符出现的次数
+“aabbbcc”---->a:2,b:3,c:2
+实现分析：
+    1.使用scanner接收输入字符串
+    2.字符串转字符数组
+    3.创建一个键为字符，值为整数的双列集合
+    4.遍历字符数组
+        判断双列集合中是否拥有某个字符为key，如果没有，直接添加，次数设置为1
+        判断双列集合中是否拥有某个字符为key，如果有，直接修改，次数设置为当前次数+1
+    5.遍历双列集合
+ */
+public class MapTest06 {
+    public static void main(String[] args) {
+        //1.使用scanner接收输入字符串
+        Scanner sc = new Scanner(System.in);
+        System.out.println("请输入字符串：");
+        String s = sc.nextLine();
+        //2.字符串转字符数组
+        char[] chars = s.toCharArray();
+        //3.创建一个键为字符，值为整数的双列集合
+        HashMap<Character, Integer> maps = new HashMap<>();
+        //4.遍历字符数组
+        for (char key : chars) {
+            if (maps.containsKey(key)) {
+                //判断双列集合中是否拥有某个字符为key，如果有，直接修改，次数设置为当前次数+1
+                /*Integer count = maps.get(key);
+                maps.put(key, count + 1);*/
+                maps.put(key, maps.get(key) + 1);
+            } else {
+                //判断双列集合中是否拥有某个字符为key，如果没有，直接添加，次数设置为1
+                maps.put(key, 1);
+            }
+        }
+
+        //5.遍历双列集合
+        //键找值
+        Set<Character> keys = maps.keySet();
+        for (Character key : keys) {
+            System.out.println(key+":"+maps.get(key));
+        }
+        //键值对遍历
+        System.out.println("---------------------");
+        Set<Map.Entry<Character, Integer>> entries = maps.entrySet();
+        for (Map.Entry<Character, Integer> entry : entries) {
+            System.out.println(entry.getKey()+":"+entry.getValue());
+        }
+
+    }
+}