How Can I Create a Two-Dimensional Array in Java?

Creating Two-Dimensional Arrays in Java

The question raised concerns the correct syntax for creating a two-dimensional array with specific dimensions. The provided code fragment initializes a multi-dimensional array but does not conform to the correct syntax for specifying dimensions.

To create a two-dimensional array of integers with 5 rows and 10 columns in Java, the appropriate syntax is:

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

This syntax declares a two-dimensional array named multi with 5 elements, each of which is an array of 10 integers. To put it simply, multi is a 5x10 grid of integer values.

Another approach is to create the array explicitly, setting each row to have the desired length:

int[][] multi = new int[5][];
multi[0] = new int[10];
multi[1] = new int[10];
multi[2] = new int[10];
multi[3] = new int[10];
multi[4] = new int[10];

This method creates a 5x10 grid and initializes each element to the default value for integers, which is 0.

An even more concise way to create and initialize a two-dimensional array is using curly braces:

int[][] multi = {
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
};

This method initializes the array to the values specified within the curly braces.

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