java - 读取文件问题

Question

当我尝试从文件读取信息以创建对象时，出现 NoSuchElementException。谁能帮我看看出了什么问题？

else if(response == 3){
    System.out.println("Enter the name of the file to load items from: ");
    loadFile = input.nextLine();
    try {
        infile = new Scanner(new FileReader(loadFile+".txt"));
    }
    catch(IOException err) {
        infile = null;
        System.out.println("Cannot open file\n");
    }
    while(infile.hasNext()){
        itemType = infile.next();
        name = infile.next();
        itemDescription = infile.next();
        itemCalories = infile.nextInt();
        itemPrice = infile.nextDouble();
        itemSpecific = infile.nextLine();
        createNewObject(counter, itemType, name, itemDescription, itemCalories, itemPrice, itemSpecific);
    }
}

我的文件“items”排列如下:

Doughnut                                  Jellydoughnut                        Roundwithfrosting                             100                                  1.22                                  creamfilling                                

Answer 1

您只检查hasNext()一次，然后在没有检查的情况下获得一堆 token 。那很危险。每个 nextXXX() 前面应该有一个 hasNextXXX()。