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Thread: ArrayList assistance

  1. #1
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    Default ArrayList assistance

    Goal is to get user input and sum together. I've tried it different ways. This is the one with the least amount of problems.

    Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: java.lang.Integer.parseInt

            ArrayList<Integer> leftCU = new ArrayList<>();
            {
                System.out.println("Please enter one at a time the number of CU's for each class that is left to complete. Enter Q when done.");
                leftCU.add(in.nextInt());
                while (in.hasNextInt()){
                    leftCU.add(in.nextInt());
                }
     
             int sum= 0;
            for(int i=0; i < leftCU.size(); i++){
                sum = sum + Integer.parseInt(leftCU.get(i));   
                            }
            }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: ArrayList assistance

    Can you post the source code line that has the error?
    If the problem is with the parseInt() method, is the arg passed to the method the correct data type?
    Read the API doc to see how to use the method.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: ArrayList assistance

    The error I get is for the line:

    sum = sum + Integer.parseInt(leftCU.get(i));

    leftCu.get(i) is highlighted with an error of: incompatible types: Integer cannot be converted into a String.

    I don't see how I'm converting it into a string though. I want everything to stay an Integer.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: ArrayList assistance

    leftCu.get(i) is highlighted with an error of: incompatible types: Integer cannot be converted into a String.
    What data type is: leftCu.get(i)
    what data type does parseInt() take?
    You need to read the API doc for the parseInt() method to see what type of arg it takes.
    If you don't understand my answer, don't ignore it, ask a question.

  5. The Following User Says Thank You to Norm For This Useful Post:

    mrivera85 (July 4th, 2014)

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