Question

我正在尝试计算与特定网址相关联的字词数，并按照它们出现的出现次数按顺序打印字词。现在它读取文件并计算单词，但是它逐行打印出来，而不是整个段落的计数。任何帮助，让它阅读整个事情并打印出来的话在它们出现的整个段落中都会很棒。

public static void main(String[] args) 
{
    try {
        URL url = new URL("http://webpagehere.txt");
        BufferedReader reader = new BufferedReader
                (new InputStreamReader(url.openStream()));
        String line;
        int i=0;
        while ((line = reader.readLine()) != null) {
            i++;
            System.out.println("Line " + i + "\t" + line);
             // Create a TreeMap to hold words as key and count as value
Map<String, Integer> map = new TreeMap<String, Integer>();

String[] words = line.split("[ \n\t\r.,;:!?(){}]");
for (int j = 0; j < words.length; j++) {
  String key = words[j].toLowerCase();

  if (key.length() > 0) {
    if (!map.containsKey(key)) {
      map.put(key, 1);
    }
    else {
      int value = map.get(key);
      value++;
      map.put(key, value);
    }
  }
}

// Get all entries into a set
Set<Map.Entry<String, Integer>> entrySet = map.entrySet();

// Get key and value from each entry
for (Map.Entry<String, Integer> entry: entrySet)
  System.out.println(entry.getKey() + "\t" + entry.getValue());


        }

        reader.close();
    } catch (UnknownHostException e) {
        JOptionPane.showMessageDialog(null, "Unknown host. Abort.");
    } catch (NoRouteToHostException e) {
        JOptionPane.showMessageDialog(null,
                                      "Cannot reach remote host. Abort.");
    } catch (java.lang.Exception e) {
        e.printStackTrace();
    }

}
}

Answer 1

您只需要在while循环之外的Map打印初始化。

public static void main(String[] args) 
    {
        try {
            URL url = new URL("http://webpagehere.txt");
            BufferedReader reader = new BufferedReader
                    (new InputStreamReader(url.openStream()));
            String line;
            int i=0;
            Map<String, Integer> map = new TreeMap<String, Integer>();
            while ((line = reader.readLine()) != null) {
                i++;
                System.out.println("Line " + i + "\t" + line);
                // Create a TreeMap to hold words as key and count as value

                String[] words = line.split("[ \n\t\r.,;:!?(){}]");
                for (int j = 0; j < words.length; j++) {
                    String key = words[j].toLowerCase();

                    if (key.length() > 0) {
                        if (!map.containsKey(key)) {
                            map.put(key, 1);
                        }
                        else {
                            int value = map.get(key);
                            value++;
                            map.put(key, value);
                        }
                    }
                }
            }
            reader.close();

            // Get all entries into a set
            Set<Map.Entry<String, Integer>> entrySet = map.entrySet();

            // Get key and value from each entry
            for (Map.Entry<String, Integer> entry: entrySet)
                System.out.println(entry.getKey() + "\t" + entry.getValue());

        } catch (UnknownHostException e) {
            System.out.println("Unknown host. Abort.");
        } catch (NoRouteToHostException e) {
            System.out.println("Cannot reach remote host. Abort.");
        } catch (java.lang.Exception e) {
            e.printStackTrace();
        }

    }

Answer 2

您的map存储单词及其出现在while循环中声明。只需将声明移出while循环即可使其正常工作。

        int i = 0;
        Map<String, Integer> map = new TreeMap<String, java.lang.Integer>();
        while ((line = reader.readLine()) != null) {

我需要打印出来自特定网址的每个单词在通道中使用的次数

2 个答案: