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Thread: Problem with Random Numbers

  1. #1
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    Default Problem with Random Numbers

    I'm working on this program where I create an array of random integers and use bubble sort to get them in order:

    package bubblesort;
     
    import java.util.Random;
    public class BubbleSort {
     
        /**
         * @param args the command line arguments
         */
        public static void main(String[] args) {
            // TODO code application logic here
            final int size = 10;
            int[] array = new int[size];
     
            Random randomNumber = new Random();
     
            for(int i=0; i<array.length; i++){
                array[i] = randomNumber.nextInt(29);
            }
     
            int[] sortedArray = bubbleSort(array);
            System.out.println(sortedArray);
        }
     
        static int[] bubbleSort(int[] numbers){
            int n = numbers.length;
     
            for(int pass=1; pass<=n; pass++){
                for(int current=0; current<n-pass; current++){
                    if(numbers[current] > numbers[current+1]){
                        //swap
                        int temp = numbers[current];
                        numbers[current] = numbers[current+1];
                        numbers[current+1] = temp;
                    }
                }
            }
            return numbers;
        }
    }


    instead of it outputting the sorted numbers I get an output of: [I@4669b7fe

    any thoughts?


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Problem with Random Numbers

    output of: [I@4669b7fe
    That is the output from the toString() method for a int array. If you want to format an array for printing, use this:
    System.out.println("an ID "+ java.util.Arrays.toString(theArrayName));
    If you don't understand my answer, don't ignore it, ask a question.

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

    3sbwya (February 17th, 2013)

  4. #3
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    Default Re: Problem with Random Numbers

    Thanks. That helped a ton

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