题解 | #统计一句话中重复单词的个数#

使用Map的getOrDefault方法

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>();
        
        for(int i=0; i<line.length(); i++){
            char c = line.charAt(i);
            if(c !=' '){
                map.put(c,map.getOrDefault(c,0)+1);
            }
        }
        

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