Question

import java.io.File;
import java.io.FileNotFoundException;
import java.util.*;

public class CarReader2 {
    String name, speed, acc;

    public CarReader2(String carName, String carSpeed, String carAcc){
    name = carName;
    speed = carSpeed;
    acc = carAcc;
    }

    public String toString(){
    return "Name of car: " +name+ "\nSpeed of car: " +speed+"\nAcceleration of car: " +acc+"\n";
    }

    public static void main(String[] args) {

    File file = new File("carlist.txt");

    try {

        Scanner sc = new Scanner(file);

        while (sc.hasNextLine()) {

            String c1Name = sc.nextLine();
            String c1Speed = sc.nextLine();
            String c1Acc = sc.nextLine();
            CarReader2 car1 = new CarReader2(c1Name,c1Speed,c1Acc);
            car1.speed = c1Speed;
            car1.acc = c1Acc;

            String c2Name = sc.nextLine();
            String c2Speed = sc.nextLine();
            String c2Acc = sc.nextLine();
            CarReader2 car2 = new CarReader2(c2Name,c1Speed,c1Acc);
            car2.speed = c2Speed;
            car2.acc = c2Acc;

            System.out.println("Information on both cars");
            System.out.println("First car:");
            System.out.println(car1.toString());
            System.out.println("Second car:");
            System.out.println(car2.toString());
        }
        sc.close();
    } 
    catch (FileNotFoundException e) {
        e.printStackTrace();



    }
    }
}

我的代码：

carlist.txt

它应该从名为carlist.txt的文件中读取2辆车的数据，然后以正确的格式打印两辆车的数据。

jonathan 3 7 dio 8 2是一个包含以下内容的文本文件：

Information on both cars
First car:
Name of car: jonathan
Speed of car: 3
Acceleration of car: 7

Second car:
Name of car: dio
Speed of car: 8
Acceleration of car: 2

该程序应打印出来，

<div class="flexslider-controls">
    <ol class="new-nav">

        <li>                        
            <div class="medium-3 columns">                          
                <div class="row">
                    <div class="columns">
                        <a href="#"><img src="images/slider-thumb-1.jpg" /></a>
                    </div>
                </div>                              
            </div>
        </li>

        <li>
            <div class="medium-3 columns">                          
                <div class="row">
                    <div class="columns">
                        <a href="#"><img src="images/slider-thumb-1.jpg" /></a>
                    </div>
                </div>                              
            </div>
        </li>

        <li>
            <div class="medium-3 columns">                          
                <div class="row">
                    <div class="columns">
                        <a href="#"><img src="images/slider-thumb-2.jpg" /></a>
                    </div>
                </div>                              
            </div>
        </li>

        <li>
            <div class="medium-3 columns">                          
                <div class="row">
                    <div class="columns">
                        <a href="#"><img src="images/slider-thumb-3.jpg" /></a>
                    </div>
                </div>                              
            </div>
        </li>

    </ol>
</div>

程序编译但没有正确运行并显示我在最顶部发布的错误。

Answer 1

您正在使用nextLine方法错误。名称，速度和加速度在同一行，但您使用3个nextLine方法来读取它们。当你试图从一个只有2行的文件中读取6行时会发生什么。使用sc.next()代替sc.nextLine()。

Answer 2

你读的太多了。您的文件中只有两行，但您尝试阅读6.您可以将文本文件更改为：

jonathan 
3 
7
dio 
8 
2

或者您可以阅读一行并分割出您想要的信息。

线程＆＃34; main＆＃34;中的例外情况java.util.NoSuchElementException：找不到行

2 个答案: