How to use data separately in an ArrayList?

Question

I'm writing a program in Java that reads data from a text file into an Arraylist. The text file has 10 lines of data and each line contains a piece of data in the format of: "Integer1-String1:String2" example: "123-ABC:DEFG".I would like to save Integer1, String1 and String2 like this:

int listNumber; //This would be Integer1
String listData1; //This would be String1
String listData2; //This would be String2

So my question is how can I do this without saving each type of data into separate array. I was thinking about something like this but it's not working:

int givenNumber = Integer.parseInt(myArrayList.substring(0, "-"));

Here is what I have so far:

final String INPUT = "data.txt";
Scanner input = new Scanner(new FileReader(INPUT));

ArrayList<String> myArrayList = new ArrayList<String>();

while (input.hasNext()){
                myArrayList.add(input.next());
            }

for (int i = 0; i < myArrayList.size(); i++) {
                int givenNumber = Integer.parseInt(myArrayList.substring(0, "-"));
                System.out.println(myArrayList.get(i)); //Print the all data
            }

Sorry if this information is not clear but I'm new to Java and and don't know to describe it better.

Answer 1

You might want to create a helper class for your data:

class ListData {
   int listNumber;
   String listData1;
   String listData2;

   ListData(int listNumber, String listData1, String listData2) {
      this.listNumber = listNumber;
      this.listData1 = listData1;
      this.listData2 = listData2;
   }

   @Override
   public String toString(){
       return listNumber + "-" + listData1 + ":" + listData2;
   }
}

And then store it in a Array of ListData:

List<ListData> datalist = new ArrayList<>();
datalist.add(new ListData(listNumber, listData1, listData2);

EDIT: Your implementation is not parsing the data from the scanner. The following snippet parses the Scanner input line by line adding to the list.

while (input.hasNext()) {
   // Read each line from the scanner
   String input = input.next();

   // Split data on two delimiters '-' and ':'
   String[] data = input.split("-|:");
   int listNumber = Integer.parseInt(data[0]);
   String listData1 = data[1];
   String listData2 = data[2];

   // Add to the datalist
   datalist.add(new ListData(listNumber, listData1, listData2));
}