使用掃描儀和文本文件在一行中獲取特定字符串

Question

因此，我想讓掃描儀分析文本文件的每一行，並在x個單詞之后停止，在這種情況下，x = 3。

我的代碼看起來像這樣：

    scannerName.nextLine();
    scannerName.next();
    scannerName.next();
    scannerName.next();

好吧，這里的問題是nextLine（）使掃描程序越過當前行AS WELL AS返回字符串。 因此，如果我調用next（），它將只找到下一行的下一個字符串（對嗎？）。

有什么方法可以滿足我的要求嗎？

謝謝

Answer 1

請嘗試以下代碼：-while（scannerName.hasNext（）！= null）{

scannerName.next(); //Returns the 1st word in the line
scannerName.next(); //Returns the 2nd word in the line
scannerName.next(); //Returns the 3rd word in the line
//Analyze the word.
scannerName.nextLine();

}

Answer 2

您的問題不是那么精確，但是我有一個從txt文件讀取的解決方案：

Scanner scan = null;
    try {
        scan = new Scanner(new File("fileName.txt"));                       
    } catch (FileNotFoundException ex) {
        System.out.println("FileNotFoundException: " + ex.getMessage());
    } catch (Exception e) {
        System.out.println("Exception: " + e.getMessage());
    }

    int wordsRead = 0;
    int wordsToRead = 3;                               //== You can change this, to what you want...
    boolean keepReading = true;

    while (scan.hasNext() && keepReading) {
        String currentString = scan.nextLine();        //== Save the entire line in a String-object 
        for (String word : currentString.split(" ")) {
            System.out.println(word);                  //== Iterates over every single word - ACCESS TO EVERY WORD HAPPENS HERE
            wordsRead++;
            if (wordsRead == wordsToRead) {
                keepReading = false;                   //== makes sure the while-loop will stop looping
                break;                                 //== breaks when your predefined limit is is reached
            } //== if-end
        } //== for-end
    } //== while-end

有任何問題請告訴我:-)