将 ArrayList 中的值添加到 HashMap

Question

基于此文本文件： 4 一部优秀的电影 0 一部糟糕的电影 3 相当不错的电影

我想知道一个单词出现的次数，并且该行中的每个单词都有一个基于行开头数字的“分数”（a=4，excellent=4，movie =4).

我的代码需要打印两个 HashMaps：总字数：{a=4, pretty=3, movie=7, bad=0, excellent=4, decent=3}

字数：{a=2, pretty=1, movie=3, bad=1, excellent=1, decent=1}

到目前为止，使用我的代码我可以打印字数，但我不确定如何进行字数总计。任何帮助，将不胜感激。谢谢。

/**
 * Given an ArrayList of review Strings, compute the total score associated with
 * each word and the number of times each word appears.
 * 
 * @param reviews     An ArrayList of lines representing reviews. The first word
 *                    in each line is a score.
 * @param totalScores a HashMap of each word as a key and its total score as the
 *                    value
 * @param wordCount   a HashMap of each word as a key and the number of times it
 *                    appears in the reviews as a value
 */
public void computeScoreAndCounts(ArrayList<String> reviews, HashMap<String, Integer> totalScores,
        HashMap<String, Integer> wordCount) {
    for (String line : reviews) {
        String[] items = line.split(" ");
        int reviewScore = Integer.parseInt(items[0]);
        String noScore = "";
        for (int index2 = 1; index2 < items.length; index2++) {
            noScore = items[index2] + " ";
            String[] items2 = noScore.split(" ");
            for (String word : items2) {
                if (wordCount.containsKey(word)) {
                    int currentCount = wordCount.get(word) + 1;
                    wordCount.put(word, currentCount);
                } else {
                    wordCount.put(word, 1);
                }
            }
            for (String word : items2) {
                if (!totalScores.containsKey(word)) {
                    totalScores.put(word, reviewScore);
                } else {
                    int totalScore = totalScores.get(word);
                    totalScores.put(word, totalScore + 1);
                }
                    
            }
        }
    }
    // Loop over all the reviews.
    // Break a review into words with String split.
    // Find the score for the review using the first item in the split array and
    // Integer.parseInt.
    // Loop over the rest of the words.
    // For each word, build up the score and total HashMap entries.

    
    System.out.println("Word totals: " + totalScores);
    System.out.println("Word counts: " + wordCount);

}

Answer 1

import java.util.regex.*;
import java.util.HashMap;
public class Program
{
    public static void main(String[] args) {

        String file = "4 a excellent movie 0 a bad movie 3 pretty decent movie";
        
        String[] scores = file.split("(?=[0-9])");
        
        HashMap<String,Integer> wordTotals = new HashMap();
        
        for (String s: scores) {
            System.out.println(s);
            String numberString = s.replaceAll("[^0-9]+","");
            Integer number = Integer.parseInt(numberString);
            String lineWithoutNumber = s.replaceAll("[0-9]","");
            System.out.println("number:"+number);
            System.out.println("line without number:"+lineWithoutNumber);
            
            String[] words = lineWithoutNumber.trim().split(" ");
            for (String word : words) {
                System.out.println("word:"+word);
                if (!wordTotals.containsKey(word)) {
                    wordTotals.put(word,0);
                }
                wordTotals.put(word, wordTotals.get(word) + number);
            }
            
        }
        
        System.out.println(wordTotals);
        
    }
}

这将是结果：

4 a excellent movie 
number:4
line without number: a excellent movie 
word:a
word:excellent
word:movie
0 a bad movie 
number:0
line without number: a bad movie 
word:a
word:bad
word:movie
3 pretty decent movie
number:3
line without number: pretty decent movie
word:pretty
word:decent
word:movie
{a=4, pretty=3, movie=7, bad=0, excellent=4, decent=3}

将 ArrayList 中的值添加到 HashMap

Adding a value from an ArrayList to a HashMap

arrays

arraylist

hashmap