技術標籤：Java開發學習筆記java

import java.util.*;

public class StringCharNumberDemo {
    public static void main(String[] args) {
        //後臺輸入一個字串
        Scanner scanner = new Scanner(System.in);
        String strings = scanner.next();
        //將字串轉化為字元陣列
        char[] chars = strings.toCharArray();
        //建立一個hashMap來存放，字元及其數量<K,V>
 

        LinkedHashMap<Character,Integer> hashMap = new LinkedHashMap<>();
        for (char aChar : chars) {
            if (!hashMap.containsKey(aChar)) {
                hashMap.put(aChar, 1);
            } else {
                hashMap.put(aChar, hashMap.get(aChar) + 1);
            }
 

        }
        //遍歷Map
        Set<Map.Entry<Character, Integer>> entries = hashMap.entrySet();
        for (Map.Entry<Character, Integer> next : entries) {
            System.out.println(next);
        }
    }
}