Question

我一直在寻找解决方案，但基本上发生的事情是我需要创建一个汽车数据库并从csv文件中导入值。当我尝试输入csv文件中的最后一个单元格时，它返回0并且输入不匹配...这里是我的代码

public void readFile(String fileName) throws Exception {
    File f = new File(fileName);
    Scanner sc = new Scanner(f);
    sc.useDelimiter(",");

    while (sc.hasNext() && i < cars.length) {
        try {

            model = sc.next();
            sc.useDelimiter(",");
            make = sc.next();
            sc.useDelimiter(",");
            mpg = sc.nextDouble();
            sc.useDelimiter(",");
            weight = sc.nextInt();
            sc.useDelimiter(",");
            year = sc.nextInt();

        } catch (InputMismatchException e) {
            System.out.println("try again");
        }

        cars[i] = new Car(model, make, mpg, weight, year);

        // System.out.println(cars[i].toString());
        i++;

输出：

Welcome to the Car Database!
Enter the size of the array:
    5
Enter the name of the input file:
    cardb.csv
    try again
    try again
    try again
    try again
    try again
Enter make, mpg, weight, all, or quit:
    all
    Model:chevelle malibu Make:chevrolet mpg:18.0 weight:3504 year:0
    Model:70
    skylark 320 Make:buick mpg:15.0 weight:3693 year:0
    Model:70
    satellite Make:plymouth mpg:18.0 weight:3436 year:0
    Model:70
    rebel sst Make:amc mpg:16.0 weight:3433 year:0
    Model:70
    torino Make:ford mpg:17.0 weight:3449 year:0

基本上年份应该说是70而不是0但是它正在读取它作为下一行的模型...... 这是cardb.csv file。

一些输入：

chevelle malibu,chevrolet,18,3504,70
skylark 320,buick,15,3693,70
satellite,plymouth,18,3436,70
rebel sst,amc,16,3433,70
torino,ford,17,3449,70
galaxie 500,ford,15,4341,70
impala,chevrolet,14,4354,70
fury iii,plymouth,14,4312,70
catalina,pontiac,14,4425,70
ambassador dpl,amc,15,3850,70
challenger se,dodge,15,3563,70
'cuda 340,plymouth,14,3609,70

以下是例外，

Exception in thread "main" java.util.InputMismatchException
    at java.util.Scanner.throwFor(Scanner.java:864)
    at java.util.Scanner.next(Scanner.java:1485)
    at java.util.Scanner.nextInt(Scanner.java:2117)
    at java.util.Scanner.nextInt(Scanner.java:2076)
    at csc212hw04.CarDatabase.readFile(CarDatabase.java:58)
    at csc212hw04.Main.main(Main.java:47)
    C:\Users\Dan1\AppData\Local\NetBeans\Cache\8.1\executor-snippets\run.xml:53: Java returned: 1
    BUILD FAILED (total time: 9 seconds)

使用Scanner解析csv文件时的InputMismatchException

0 个答案: