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Thread: Creating Objects at specified indexes

  1. #1
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    Question Creating Objects at specified indexes

    Hi,

    I am trying to add created objects to an ArrayList in a for-loop through indexes. The code below gives me errors when I try compile

    //Create 4 Question objects...
    Question ques1 = new Question("First", 1);
    Question ques2 = new Question("First", 2);
    Question ques3 = new Question("First", 3);
    Question ques4 = new Question("First", 4);
     
    //Create an empty Question ArrayList
    ArrayList<Question> list = new ArrayList<Question>();
     
    //for loop through 4 times starting at index 1
    for(int i=1; i<=4; i++)
    {
            //Trying to add each Question object along with the specified index during the loop.
    	list.add(ques+i);
    }

    The code outputs: cannot find symbol: variable ques

    Could anyone identify the problem?

    Thanks


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    Super Moderator Norm's Avatar
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    Default Re: Creating Objects at specified indexes

    cannot find symbol: variable ques
    The compiler can not find a variable named: ques
    Where is that variable defined?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Creating Objects at specified indexes

    I understand how the compiler cannot find ques, but I used a for loop to add each index to the ques variable (ques+i).

    So according to the compiler, wouldn't it look as if the variable is ques1, ques2, etc (where 1, 2, etc are the indexes)?

    Do you get where I am trying to get at?

    Thanks

  4. #4
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    Default Re: Creating Objects at specified indexes

    Variable names are defined when you type them into the source code.
    If you want to change the contents of a String variable from "ques1" to "ques2" etc then enclose ques in "s like this:
    "ques" + 1

    You can use those Strings as keys in a Map to allow you to access objects using one of those Strings as the key.

    Otherwise define an array with the names of the Question variables.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Creating Objects at specified indexes

    Thanks, yea il try that so

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