Syntax for creating a two-dimensional array

Question

Consider:

int[][] multD = new int[5][];
multD[0] = new int[10];

Is this how you create a two-dimensional array with 5 rows and 10 columns?

I saw this code online, but the syntax didn't make sense.

Answer 1

The most common idiom to create a two-dimensional array with 5 rows and 10 columns is:

int[][] multD = new int[5][10];

_{Alternatively, you could use the following, which is more similar to what you have, though you need to explicitly initialize each row:}

int[][] multD = new int[5][];
for (int i = 0; i < 5; i++) {
  multD[i] = new int[10];
}

Answer 2

It is also possible to declare it the following way. It's not good design, but it works.

int[] twoDimIntArray[] = new int[5][10];

Answer 3

int [][] twoDim = new int [5][5];

int a = (twoDim.length);//5
int b = (twoDim[0].length);//5

for(int i = 0; i < a; i++){ // 1 2 3 4 5
    for(int j = 0; j <b; j++) { // 1 2 3 4 5
        int x = (i+1)*(j+1);
        twoDim[i][j] = x;
        if (x<10) {
            System.out.print(" " + x + " ");
        } else {
            System.out.print(x + " ");
        }
    }//end of for J
    System.out.println();
}//end of for i

Answer 4

int rows = 5;
int cols = 10;

int[] multD = new int[rows * cols];

for (int r = 0; r < rows; r++)
{
  for (int c = 0; c < cols; c++)
  {
     int index = r * cols + c;
     multD[index] = index * 2;
  }
}

Enjoy!

Answer 5

In Java, a two-dimensional array can be declared as the same as a one-dimensional array. In a one-dimensional array you can write like

  int array[] = new int[5];

where int is a data type, array[] is an array declaration, and new array is an array with its objects with five indexes.

Like that, you can write a two-dimensional array as the following.

  int array[][];
  array = new int[3][4];

Here array is an int data type. I have firstly declared on a one-dimensional array of that types, then a 3 row and 4 column array is created.

In your code

int[][] multD = new int[5][];
multD[0] = new int[10];

means that you have created a two-dimensional array, with five rows. In the first row there are 10 columns. In Java you can select the column size for every row as you desire.

Answer 6

We can declare a two dimensional array and directly store elements at the time of its declaration as:

int marks[][]={{50,60,55,67,70},{62,65,70,70,81},{72,66,77,80,69}};

Here int represents integer type elements stored into the array and the array name is 'marks'. int is the datatype for all the elements represented inside the "{" and "}" braces because an array is a collection of elements having the same data type.

Coming back to our statement written above: each row of elements should be written inside the curly braces. The rows and the elements in each row should be separated by a commas.

Now observe the statement: you can get there are 3 rows and 5 columns, so the JVM creates 3 * 5 = 15 blocks of memory. These blocks can be individually referred ta as:

marks[0][0]  marks[0][1]  marks[0][2]  marks[0][3]  marks[0][4]
marks[1][0]  marks[1][1]  marks[1][2]  marks[1][3]  marks[1][4]
marks[2][0]  marks[2][1]  marks[2][2]  marks[2][3]  marks[2][4]

NOTE:
If you want to store n elements then the array index starts from zero and ends at n-1. Another way of creating a two dimensional array is by declaring the array first and then allotting memory for it by using new operator.

int marks[][];           // declare marks array
marks = new int[3][5];   // allocate memory for storing 15 elements

By combining the above two we can write:

int marks[][] = new int[3][5];