java - 对于 Java 中的每个循环都有字数

Question

我有一个存储在 String 中的长文本(即 tstr1 im 代码)。现在我想将来自控制台的用户输入存储在 String[] 中(即 itemsFromArray im 代码)。

我希望对于存储在用户输入 String[] 数组中的每个单词，系统显示该单词在长 Text String[] 数组中出现的次数。我尝试过这种方式，但问题是系统只显示数组中第一个条目的计数，但下一个条目显示为零。

  btnNewButton.addActionListener( new ActionListener()
    {
        public void actionPerformed(ActionEvent e)
        {
            keyW = txtKeyword.getText();
            search = textField.getText();
            System.out.println("String for car = " + search); 
            System.out.println("String keyword = " + keyW); 

        WebDriver driver = new FirefoxDriver();
        driver.get("https://en.wikipedia.org/wiki/" + search);
        tstr1 = driver.findElement(By.xpath("//*[@id='content']")).getText();

        String [] itemsFromArray = keyW.split(",");  
        Map<String, Integer> map = new HashMap<String, Integer>();
        for (String word : itemsFromArray){
            map.put(word, 0);
        }
         Scanner s = new Scanner(tstr1);
        while (s.hasNext()){
            String word = s.next();
            if (map.containsKey(word)){
                map.put(word, map.get(word) + 1);
                System.out.println("Word1 '" + word + "' count:" + map.get(word));
            } else {
                System.out.println("Word2 '" + word + "' not in map");
            }
        }

        driver.close();  
        }   
    }); 

Answer 1

最好使用 Map<String, Integer> :

// initialize a mapping that is used to map words to their count   
Map<String, Integer> counter = new HashMap<String, Integer>();

// initialize all counts to 0
for (String word : itemsFromArray){
    counter.put(word, 0);
}

// ...

// count words that are in map (give up those that aren't)
while (s.hasNext()){
    String word = s.next();
    if (counter.containsKey(word)){
        counter.put(word, counter.get(word) + 1);
        System.output.println("Word '" + word + "' count:" + counter.get(word));
    } else {
        System.output.println("Word '" + word + "' not in map");
    }
}