Java 方法无效，导致程序挂起

Question

您好，我正在编写一个程序来分析一段文本，特别是读取一个文件并计算该文件中的行数、单词数和数字数。

我尝试在方法中的单独 class 中计算行数，然后尝试在主 class 中调用该方法以打印文件中的总行数，然而，这并没有像我预期的那样工作，并且在我尝试调用行计数方法时导致程序挂起。非常感谢任何帮助！

主要Class：

package cw;

import java.util.Scanner;

public class TextAnalyser {

    public static void main(String[] args) {
        LineCounter object = new LineCounter();

        Scanner sc = new Scanner(TextAnalyser.class.getResourceAsStream("test.txt"));
        int totalNumbers = 0;
        int totalDigits = 0;
        int totalWordCount = 0;
        int totalLines = 0;

        while (sc.hasNext()) {
            totalWordCount++;

            if (sc.hasNextInt()) {
                totalDigits += sc.nextInt();
                totalNumbers++;
            }
            else {
                sc.next();
            }
        }

        System.out.println("The total of all digits added = " + totalDigits);
        System.out.println("The total number of digits in the file = " + totalNumbers);
        System.out.println("The total number of words in the file = " + totalWordCount);
        object.TotalLines();
    }
}

行计数class:

package cw;
import java.util.Scanner;
//Class that counts the lines in a file.
public class LineCounter {
    public static void TotalLines() {
        Scanner sc = new Scanner(TextAnalyser.class.getResourceAsStream("test.txt"));
        System.out.println("hi");
        int linetotal = 0;
        while (sc.hasNextLine()) {
            linetotal++;
        }

        System.out.println(linetotal);
    }
}

Answer 1

hasNextLine() 只会告诉您是否有下一行 - 它不会读取它。所以你站在开头，一次又一次地问 "is there a next line?" ...你应该尝试通过 nextLine();

实际阅读它

Answer 2

just add 这个 line of code :

while(sc.hasNextLine()){
          String sentence = sc.nextLine();
          linetotal++;
      }

在您的 public static void TotalLines(){ 方法中...

这样你actually get the next line，not only询问你的while中是否存在另一行（alwaysreturns true 然后你 never 退出 while 循环！）

Java 方法无效，导致程序挂起

Java method not working, causing program to hang

java

methods

class