1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    
    PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));

    String str = br.readLine();
    
    String[] wordStrings = str.split("\\s+");

    Map<String, Integer> hMap = new HashMap<>();
    
    for (String word : wordStrings) {
        hMap.put(word, hMap.getOrDefault(word, 0) + 1);
    }

    //    Map.Entry<String, Integer>：表示Map中的一个键值对（包含key和value）
    List<Map.Entry<String, Integer>> keywords = new ArrayList<>();
    
    for (Map.Entry<String, Integer> entry : hMap.entrySet()) {
        // 只保留出现次数≥3的单词
        if (entry.getValue() >= 3) {
            keywords.add(entry);
        }
    }

    keywords.sort((o1, o2) -> {

        if (!o1.getValue().equals(o2.getValue()) ) {
            return o2.getValue() - o1.getValue();// 降序
        } else {
            return o1.getKey().compareTo(o2.getKey());// 升序
        }
    });

    for(Map.Entry<String,Integer> entry:keywords){
        out.println(entry.getKey());
    }

    out.flush();
    out.close();
    br.close();
}