從文件讀入字符串，但是一行上空格后的所有文本都被刪除了？

Question

我有一個帶有如下短語的大文本文件：

citybred JJ 
Brestowe NNP 
STARS NNP NNS
negative JJ NN
investors NNS NNPS
mountain NN 

我的目標是保留每行的第一個單詞，不帶空格，並使其小寫。 EX：

citybred 
brestowe
stars
negative
investors
mountain

如果上述文字經過評估，將返回。

有什么幫助嗎？

當前代碼：

public class FileLinkList
{
    public static void main(String args[])throws IOException{
        String content = new String();
        File file = new File("abc.txt");
        LinkedList<String> list = new LinkedList<String>();

        try {
            Scanner sc = new Scanner(new FileInputStream(file));
            while (sc.hasNextLine()){
                content = sc.nextLine();
                list.add(content);
            }
            sc.close();
        } catch(FileNotFoundException fnf){
            fnf.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("\nProgram terminated Safely...");
        }

        Collections.reverse(list);
        Iterator i = list.iterator();
        while (i.hasNext()) {
            System.out.print("Node " + (count++) + " : ");
            System.out.println(i.next());
        }
    }
}

Answer 1

如果您的令牌及其POS標簽用空格隔開：

public class FileLinkList{

    public static void main(String[] args) {

        BufferedReader br = null;
            LinkedList<String> list = new LinkedList<String>();
            String word;
        try {
            String sCurrentLine;
            br = new BufferedReader(new FileReader("LEXICON.txt"));
            while ((sCurrentLine = br.readLine()) != null) {
                System.out.println(sCurrentLine);
                            word = sCurrentLine.trim().split(" ")[0];
                            list.add(word.toLowerCase());
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null)
                                br.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}

Answer 2

添加以下內容：

content = sc.nextLine();
string[] tokens = content.split(new char[] {' '}, StringSplitOptions.RemovEemptyEntries);
// You can add some validations here...
string word = tokens[0].ToLowerCase();

Answer 3

嘗試這個 ：

public class FileLinkList {
    public static void main(String args[])throws IOException{
        String content = new String();
        int count=1;
        File file = new File("abc.txt");
        LinkedList<String> list = new LinkedList<String>();

        try {
            Scanner sc = new Scanner(new FileInputStream(file));
            while (sc.hasNextLine()){
                content = sc.nextLine();
                if (content != null && content.length() > 0)) {
                    list.add(content.trim().split(" ")[0].toLowerCase());
                }
            }
            sc.close();
        } catch(FileNotFoundException fnf){
            fnf.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("\nProgram terminated Safely...");
        }

        for (String listItem : list) {
            System.out.println(listItem);
        }
    }
}

Answer 4

使用Apache Commons IO ，將文件讀入字符串列表要簡單得多。

import org.apache.commons.io.FileUtils;

List<String> lines = FileUtils.readLines(new File("abc.txt"));
List<String firstWords = new ArrayList<>();
for (String line : lines) {
  String firstWord = line.split(" ")[0].toLowerCase();
  firstWords.add(firstWord);
}