Java练习题_Map 统计一段文章中每个(或指定)单词出现的次数,
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统计一段文章中每个单词出现的次数,
this is a book this is an elephont
也可以只统计指定单词
1 import java.util.Collection;
2 import java.util.HashMap;
3 import java.util.Map;
4 import java.util.Map.Entry;
5
6 public class TestDay19_2 {
7
8 public static void main(String[] args) {
9
10 String s = "As a student, we have study for many years. " + "During there years, we study Chinese, English, "
11 + "science and so on. In this period, with the improvement of our knowledge,"
12 + "we not only read the books in class but also read extracurricular after school. "
13 + "In my opinion Dream of the red chamber is the best book I have read. "
14 + "In this book, the great author Cao xueqin his view about love. "
15 + "He had firmly faith in what is the true love and try to tell us "
16 + "that there are different kinds of love, "
17 + "only one kind which should be considered as True Love. In a dream, "
18 + "and under mythical circumstances, the main character of the novel, "
19 + "Jia baoyu, met the Fairy Disenchantment in the Land of Illusions. "
20 + "She showed him three registers each containing the names "
21 + "and the happenings in life of 12 girls in his clan. "
22 + "Each girl represents a kind of love. From the stories " + "which are unfolding in the novel, "
23 + "the reader should know the characteristics of the different kinds of love, "
24 + "and should be able to distinguish True Love from the other kinds. "
25 + "True love is acceptance, committal, mutual and without any post conditions. "
26 + "The love between Lin daiyu and Jia baoyu is considered to be True Love. "
27 + "Just saying or hearing I love you is not good enough because talk is cheap. "
28 + "Action in mutual commitment is essential, as we can see in the novel. "
29 + "We always have dreams. What‘s ours dream? Do you know what you exactly want? "
30 + "And do you work hard for it. In this book, "
31 + "you can taste the feeling of the author about his strong will. In his words, "
32 + "you can find the charm of Chinese. It is not a book, but a precious deposits. "
33 + "You can get a lot from it. But unfortunately, "
34 + "the novel was never completed to such a state. On the other hand, maybe, "
35 + "it is another kind of beauty of the book. If you have not read this book yet, "
36 + "just go and read it. You will love it. ";
37 String[] ss = s.split(" ");
38
39 HashMap<String, Integer> hm = new HashMap<>();
40 // 指定想要统计的单词
41 hm.put("this", 0);
42 hm.put("is", 0);
43 hm.put("a", 0);
44 hm.put("book", 0);
45 hm.put("an", 0);
46
47 for (int i = 0; i < ss.length; i++) {
48 String word = ss[i];
49 if (hm.containsKey(word)) {
50 hm.put(word, hm.get(word) + 1);
51 }
52 // 把下面这三行放开就是统计每个单词的次数
53 // else{
54 // hm.put(ss[i], 1);
55 // }
56 }
57
58 Collection<Map.Entry<String, Integer>> c = hm.entrySet();
59 for (Entry<String, Integer> entry : c) {
60 System.out.println(entry.getKey() + "出现了" + entry.getValue() + "次");
61 }
62 }
63 }
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