题解 | 统计一句话中重复单词的个数

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String line = scanner.nextLine();
        Map<Character, Integer> map = new LinkedHashMap<Character, Integer>();

        //write your code here......
        getCharCount(line, map);

        Set<Map.Entry<Character, Integer>> entrys = map.entrySet();
        for (Map.Entry<Character, Integer> entry : entrys) {
            System.out.println(entry.getKey() + ":" + entry.getValue());
        }
    }

    public static void getCharCount(String line, Map<Character, Integer> map){
        char[] chars = line.toCharArray();
        for(char c : chars){
            if(isUseful(c)){
                if(map.containsKey(c)){
                    map.put(c, map.get(c) + 1);
                } else{
                    map.put(c, 1);
                }
            }
        }
    }

    public static boolean isUseful(char c){
        if(c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z'){
            return true;
        }
        return false;
    }
}