try 和 catch 语句没有给我任何结果？

Question

**The aim of the code is to read some data from a file. The data is split into a few lines and the data on each line is split using the "-" character. The code should spliut the data into separate strings and transfer the separate strings into an array called "splitLine". The point of the test data is that is throws an "ArrayIndexOutOfBoundsException" in which it does. However, after this exception is given, the catch should simply allow the code to continue however it's not working. **

public class asd 

{

    public static void main(String[] args)
    {
        String line = "";
        String[] splitLine;
        Scanner keyboard = new Scanner (System.in);
        System.out.print("Enter the file name: ");
        String filename = keyboard.nextLine();

        Scanner fileReader = null;

        try
        {
            File Fileobject = new File (filename);
            fileReader = new Scanner (Fileobject);
            System.out.println("The file " + filename + " contains the following lines");
            System.out.println("==============================");
            int x=0;




            while(fileReader.hasNext())
            { 
                try 
                {
                    line = fileReader.nextLine();
                    splitLine = line.split(" - "); //For assignment use line.split(" - ")
                    System.out.printf("Title: %20s \nAuthor: %17s \nPublisher: %9s\nPrice: %10s\nPages: %8s\nISBN: %16s\n===================\n", splitLine[x] , splitLine[x+1], splitLine[x+2], splitLine[x+3], splitLine[x+4], splitLine[x+5]);
                } 
                catch (ArrayIndexOutOfBoundsException  e) 
                {
                    continue;
                }





        }
    }
        catch(FileNotFoundException e)
            {
                System.out.println("Error - file does not exist");
                System.exit(0);
            } 

    }
}

Answer 1

I recommend to do validations on input before accessing it, and not just to use it and fail on exceptions.

---

Another Direction:

Anyway - per your message, your data is organized with " - ", so why not just to save the same data as JSON file ?

Then you can read it to your object like that: First, create your own Article.java class Then, write code like below:

import com.fasterxml.jackson.*

    public static void someMethod()
    {
        File file = new File("....somepath...\\Desktop\\data.json");
        ObjectMapper mapper = new ObjectMapper();
        Article article = mapper.readValue(file , Article.class);

        System.out.printf("Title: %20s \nAuthor: %17s \nPublisher: %9s\nPrice: %10s\nPages: %8s\nISBN: %16s\n===================\n", article.getTitle(), article.getPublisher(), article.getPrice(), article.getPages(), article.getSomethingMore1(), article.getSomethingMore2());

    }

Answer 2

So as far as I understand you want to skip iteration when the splitLine doesn't contain the required values? In that case wouldn't it be simpler to just check if you have enough params?

 splitLine = line.split(" - "); //For assignment use line.split(" - ")
 if(splitLine.lenght != 6) {
  continue;
 }
 System.out.printf("Title: %20s \nAuthor: %17s \nPublisher: %9s\nPrice: %10s\nPages: %8s\nISBN: %16s\n===================\n", splitLine[x] , splitLine[x+1], splitLine[x+2], splitLine[x+3], splitLine[x+4], splitLine[x+5]);

Also I would recommend extracting the inner try to a separate method for better readability