Question

我正在开展一个项目，要求我为大学加载一些课程。每门课程由课程名称（例如“CSCI 150”，“CSCI 150L”）和章节编号（前“CSCI 150 1”，“CSCI 150L 1”）组成。

我正在尝试使用这些课程加载arrayList，但每次我尝试在之后显示它们时，我会收到输入不匹配异常或Nosuchelement异常

以下是我的代码看起来像我正在使用的文本文件来测试它。

public class Prog6 {

/**
 * @param args
 * @throws FileNotFoundException 
 */
public static void main(String[] args) throws FileNotFoundException {
    // TODO Auto-generated method stub

    School university = new School();
    File aFile = new File("prog6.txt");
    Scanner fileReader = new Scanner(aFile);
    String courseName;
    int section;
    int numberEnrolled;

    while(fileReader.hasNextLine()){
        courseName = fileReader.next() + fileReader.next();
        section = fileReader.nextInt();
        Course aCourse = new Course(courseName, section);
        university.addCourse(aCourse);
    }

    university.displayCourses();



}

}

文本文件看起来完全像这样：

CSCI 150 1
CSCI 150 2
CSCI 150L 1
CSCI 140 1
MATH 174 1
MATH 132 2
MATH 412L 1
MATH 174 2
BIOL 110 1
BIOL 210 1
CBAD 310L 1
CBAD 110 1
CBAD 210 2

Answer 1

我没有编译它，可能会有一些小的语法错误，但这应该可以解决问题。

import java.util.regex.*;
import java.util.Scanner;

public class Prog6 {

/**
 * @param args
 * @throws FileNotFoundException 
 */
    public static void main(String[] args) throws FileNotFoundException {
        // TODO Auto-generated method stub

        School university = new School();
        File aFile = new File("prog6.txt");
        Scanner fileReader = new Scanner(aFile);
        String courseName;
        int section = -1;
        int numberEnrolled;
        String currentLine = "";
        String regex = "(\\S+)(\\s)(\\S+)(\\s)(\\d)";
        Pattern regexPattern = Pattern.compile(regex);
        Matcher matcher;
        while(fileReader.hasNextLine()){
            courseName = "";
            currentLine = fileReader.nextLine();
            try {
                matcher = regexPattern.match(currentLine);
                matcher.find();
                courseName = matcher.group(1) + matcher.group(3);
                section = Integer.parseInt(matcher.group(5));
            }   catch   (Exception e)   {
                System.out.println(e.getMessage());
            }
            Course aCourse = new Course(courseName, section);
            university.addCourse(aCourse);
        }
        university.displayCourses();
        fileReader.close();
    }
}

使用不同的变量类型从文本文件填充ArrayList

1 个答案: