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Thread: I don't know why this error using get() method from the ArrayList class

  1. #1
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    Default I don't know why this error using get() method from the ArrayList class

    Hi Every body!

    I'm trying to store (momently) each element of a ArrayList in a Programmer object variable to use one of its method, but I'm getting and and error and a warning I don't know neither why nor how to fix it


    public double getBonusPay() {
            //bonus pay = base bonus * (1 - 0.01 * number of programmers that have overtime pay)
            double totalbonus = 0.00;
            int i;        
            int numProgrammers = 0;
            Programmer proWithoverp;
            for(i = 0; i <= this.juniors.size(); i++){
                proWithoverp = this.juniors.get(i); // <<============here is where I get the error, but I don't know why
                if(proWithoverp.getOvertimePay() > 0){
                    numProgrammers++;
                }
                if(numProgrammers <= 100){
                    totalbonus = getBaseBonus() * (1 - 0.01 * numProgrammers);
                }
            }
     
            return totalbonus;
        }



    in the constructor I declared juniors as:

    this.juniors = new ArrayList();



    this is the error and the warning
    javac -Xlint Test.java
    ./jac444b/a1/Manager.java:24: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.ArrayList
    this.juniors.add(pgr);
    ^
    ./jac444b/a1/Manager.java:56: incompatible types
    found : java.lang.Object
    required: jac444b.a1.Programmer
    proWithoverp = this.juniors.get(i);
    ^
    1 error
    1 warning


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    Default

    Junior has to be declared as

    ArrayList<Programmers> juniors = new ArrayList();

    or you can cast what you get from the Array

    proWithoverp = (Programmers)this.juniors.get(i);
    Last edited by felimblack; February 11th, 2012 at 02:36 PM.

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    Default Re: I don't know why this error using get() method from the ArrayList class

    hi there!

    How do i do that??? because If I type what you wrote I get a syntax error

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    Default Re: I don't know why this error using get() method from the ArrayList class

    javac -Xlint Test.java

    Why are you running it with that the Xlint argument? I'm asking this not because its bad, but because you don't understand what it does.
    -Xlint argument enforces stricter checks on your code, throwing warning messages at you in such events as using deprecated methods and unchecked raw objects.

    Felimblack's code isn't running for you either because it still triggers the Xlint command.
    ArrayList<Programmers> juniors = new ArrayList<Programmers>(); would be the correct syntax, or if you're using Java 7, ArrayList<Programmers> juniors = new ArrayList<>(); works just the same.
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

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    Default Re: I don't know why this error using get() method from the ArrayList class

    Hi! thanks for answering!


    I'm SO sorry!!!!!!! my bad!!! I wrote ProgrammerS instead of Programmer now the code works fine without any error!! thanks so much!!! both of you
    Last edited by juanp_1982; February 11th, 2012 at 03:21 PM.

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