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Thread: Array toString

  1. #1
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    Default Array toString

    I got this to compile but in the interaction pane im trying to make it look like the picture below but i come out with 0, 1 , 2, 55.8. Thanks

    lab5unittest1.gif

    HTML Code:
       public class TestScores
       {
          private double[] scores;
       
          public TestScores(double [] newScores)
          {
             scores = new double[newScores.length];
             for (int i = 0; i < newScores.length; i++)
             {
                scores[i] = newScores[i];
             }
          }
          public double getAverage()
          {
             double average = 0.0;
             double total = 0.0;
          
             for (double val : scores)
             {
                total += val;
             }
          
             average = total / scores.length;
          	
             return average;
          }
        
          public String toString(){
             String str = "";
          
             for(int i = 0; i < scores.length; i++)
             {
                str += i + " ";
             }
          
             str += scores[scores.length];
             return str;
          }	 
         
          
       }
       
       


  2. #2
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    Default Re: Array toString

    Use a for loop to increment a variable, this variable is to be used as an index for accessing the array elements, append the array element to a string, loop. All i can say without giving code...

  3. The Following User Says Thank You to JJeng For This Useful Post:

    smithmar (July 23rd, 2012)

  4. #3
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    Default Re: Array toString

    Quote Originally Posted by smithmar View Post
    I got this to compile but in the interaction pane im trying to make it look like the picture below but i come out with 0, 1 , 2, 55.8.

    Really? I came out with "Exception in evaluation thread java.lang.ArrayIndexOutOfBoundsException: 3"

    Instead of playing with the interactive mode in jGRASP, here's my suggestion:

    Make a file with a public class that has a public static void main() function that creates the array and instantiates a TestScores object and tries the toString() method.

    Compile and execute the code and see how it goes. If there are problems that you don't understand, then post the complete code and post the exact message(s) Don't paraphrase.

    That way, everyone can be working on exactly the same thing that you are doing and maybe someone can offer meaningful help that directly applies to the actual code that you are using.

    [/begin Editorial]
    I mean, I know that all of the books seem to recommend some kind of IDE for beginners, but I have found it extremely frustrating to try to help people understand Java fundamentals when the IDE keeps getting in the way. (Especially when I am not in the same room, looking over their shoulder and making sure that they click the right "intuitive" icon or follow an "intuitive" menu sequence.) People end up learning all kinds of stuff about a particular IDE instead of concentrating on learning Java.
    [/end Editorial]


    Compiling with command line javac and executing with command line java is kind of a "least common denominator" that every one can relate to and can, maybe, reproduce your exact problem.

    After people have gained a thorough knowledge of fundamentals, the right IDE can make management of large projects somewhat easier to organize, and then I say "Go for it!" They won't be needing to ask me for help anyhow...


    Cheers!

    Z
    Last edited by Zaphod_b; July 23rd, 2012 at 05:23 PM.

  5. #4
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    Default Re: Array toString

    Thanks guys, i figured it out. Had to change my String str line to str += scores[i] + " ";

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