Initialising a multidimensional array in Java

Question

What is the correct way to declare a multidimensional array and assign values to it?

This is what I have:

int x = 5;
int y = 5;

String[][] myStringA         


        

Answer 1

Multidimensional Array in Java

Returning a multidimensional array

Java does not truely support multidimensional arrays. In Java, a two-dimensional array is simply an array of arrays, a three-dimensional array is an array of arrays of arrays, a four-dimensional array is an array of arrays of arrays of arrays, and so on...

We can define a two-dimensional array as:

1. int[ ] num[ ] = {{1,2}, {1,2}, {1,2}, {1,2}}

2. int[ ][ ] num = new int[4][2]

   num[0][0] = 1;
   num[0][1] = 2;
   num[1][0] = 1;
   num[1][1] = 2;
   num[2][0] = 1;
   num[2][1] = 2;
   num[3][0] = 1;
   num[3][1] = 2;
   

   If you don't allocate, let's say num[2][1], it is not initialized and then it is automatically allocated 0, that is, automatically num[2][1] = 0;

3. Below, num1.length gives you rows.

4. While num1[0].length gives you the number of elements related to num1[0]. Here num1[0] has related arrays num1[0][0] and num[0][1] only.

5. Here we used a for loop which helps us to calculate num1[i].length. Here i is incremented through a loop.

   class array
   {
       static int[][] add(int[][] num1,int[][] num2)
       {
           int[][] temp = new int[num1.length][num1[0].length];
           for(int i = 0; i