How to Declare and Initialize Multidimensional Arrays in Java?

Multidimensional Array Initialization in Java

Question:

How can you declare and initialize a multidimensional array in Java?

Answer:

Unlike some other programming languages, Java does not support "true" multidimensional arrays. Instead, arrays are organized as an array of arrays.

Declaration:

To declare a multidimensional array, you define the dimensions separately. For example, to create a 3-dimensional array, you can declare it as:

int[][][] threeDimArr = new int[4][5][6];

Alternatively, you can initialize the elements during declaration:

int[][][] threeDimArr = { { { 1, 2 }, { 3, 4 } }, { { 5, 6 }, { 7, 8 } } };

Access:

To access elements within a multidimensional array, you use the indexes of each dimension. For instance:

int x = threeDimArr[1][0][1]; // Accesses the value at index [1][0][1]

You can also access an entire row or column:

int[][] row = threeDimArr[1]; // Accesses the second row of threeDimArr

String Representation:

To obtain a string representation of a multidimensional array, you can use the Arrays.deepToString() method:

String strRep = Arrays.deepToString(threeDimArr);

Which produces the following output:

"[[[1, 2], [3, 4]], [[5, 6], [7, 8]]]

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