Question

I have a program that I am trying to take a set of numbers from a string separated by commas and place them into an ArrayList; however, I’m not quite sure how to do it. So far what I have done is turn the String into an array of chars and then convert the chars into ints by using:

Character.digit(temp[i], 10)

This example is in a for loop iterating over a string. Let’s say in this case "1,2,3,4". taking the first element of the new char array and converting it to a int.

My issue is,

• A: there has to be a better way of doing this.
• B: what happens if you get a 2 or three digit number instead, e.g, "34,2,3,65,125". these will be stored as separate elements of the array when i need it to be one element.
• C: what happens if the number is a negative one, and what if that negative number is 2 or three digits long? E.g., "-123,45,3,4,-6".

Remember that this is mean to be for any String argument.

There are lots of conditions here and I’m not sure how to solve them.

Answer 1

you could just do:

String input = "-12,23,123123";
String[] numbers = input.split(",");
List<Integer> result = new ArrayList<Integer>();
for(String number : numbers){
    result.add(Integer.parseInt(number));
}