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Thread: About Array

  1. #1
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    Default About Array

    Hello Experts!

    I am new to this forum.
    Could you please tell me how this multi-dimensional array works? How it corresponds to differents style of outputs format like triangle shape of elements output?
    class TwoDAgain {
    public static void main(String args[]) {
    int twoD[][] = new int[4][];
    twoD[0] = new int[1];
    twoD[1] = new int[2];
    twoD[2] = new int[3];
    twoD[3] = new int[4];
    int i, j, k = 0;
    for(i=0; i<4; i++)
    for(j=0; j<i+1; j++) {
    twoD[i][j] = k;
    k++;
    }
    for(i=0; i<4; i++) {
    for(j=0; j<i+1; j++)
    System.out.print(twoD[i][j] + " ");
    System.out.println();
    }
    }
    }
    output:
    0
    1 2
    3 4 5
    6 7 8 9

    Regards
    Kaan


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: About Array

    how this multi-dimensional array works
    Multidim arrays are really a grouping of single dim arrays.
    Each dim of the array can contain an array of a unique dimensions.

    int twoD[][] = new int[4][];  // Create 2 dim array with 4 slots in the first dim
    twoD[0] = new int[1];          //  set the first array to be a one dim array with 1 slot
    twoD[1] = new int[2];          //  set the second array to be a one dim with 2 slots
    twoD[2] = new int[3];         //  set the third array to be a one dim with 3 slots
    twoD[3] = new int[4];         //  set the forth array to be a one dim with 4 slots
    The valid indexes for the above array would be:
    0,0
    1,0 1,1
    2,0 2,1 2,2
    3,0 3,1 3,2 3,3

  3. #3
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    Default Re: About Array

    Hello and welcome.

    In future, please post questions in the correct forum. Moved to - Collections and Generics

    I have also added the highlight tags to your code. See my signature.
    Please use [highlight=Java] code [/highlight] tags when posting your code.
    Forum Tip: Add to peoples reputation by clicking the button on their useful posts.

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