Creating and Using arrays

Question

I am new to the concept of arrays in java, and as part of an assignment, I am required to create a 10 row by 3 column integer array and populate it with a for loop. I have the following.

  public class arrays{

  int arr[][][] = new int [10][10][10];

    for(int i=0;i<arr.length;++i)
    {
        for(int j=0;j<arr[i].length;++j)
        {
            System.out.print(arr[i][j] + " ");
        }
        System.out.println();
    }
}

am I on the right track?

If your idea of array dimension syntax was actually used by Java, how do you imagine creating a 10 row by 3,000,000 column array would look like? — Marko Topolnik
– Marko Topolnik, Commented Mar 3, 2014 at 10:38
@user3263215 I hope it is now clear for you, see the trails tutorial as well. — xlm
– xlm, Commented Mar 3, 2014 at 10:45

xlm · Accepted Answer · 2014-03-03 10:36:18Z

1

You are actually declaring a 3-dimensional array.
You should instead be declaring int[][] arr = new int[10][3];.
You can then assign values as follows: arr[i][j] = 42;

Note also that when instantiated, the initial values in the array are 0.

edited Mar 3, 2014 at 10:36

answered Mar 3, 2014 at 10:29

xlm

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2 Comments

user3263215 Over a year ago

Ah i see. I am trying to populate the first and second column with some numbers. Is the for loop i've got suitable for this?

xlm Over a year ago

@user3263215 looks fine for iterating through.

RMachnik · Accepted Answer · 2014-03-03 10:34:30Z

0

The way of creating array in java is simple and I see you know that but for your problem applicable array might be different. Try that one int arr[][] = new int [10][3];

for(int i=0;i<arr.length;i++){
  for(int j=0;j<arr[i].length;j++){
      arr[i][j] = your_integer_value;
   }

}

answered Mar 3, 2014 at 10:34

RMachnik

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