Syntax For Creating A Two-Dimensional Array In Java

Here we will discuss Syntax For Creating A Two-Dimensional Array In Java where we need to provide two square brackets before the array variable name and just after the data type in java where it was somewhat different in the case of C and C++. So let’s see how to initialize a two -dimensional array with some examples.

 

Two Dimensional Array

Two -dimensional array is nothing but a metric where we have rows and columns to store the data. where we have to enter the data in a way that it should satisfy the R*C row multiply column criteria and the number of elements it can accommodate is R*C.

Syntax Of Two Dimensional Array

we have to specify the size, data type, and variable name in two -dimensional array to initialize for the same following the syntax given below.

<data Type> [][] <Variable name> = new <Data type> [n][m]
where n and m are the size of rows  and columns 
for example
int[][] arr = new int[3][3];

In the given example the metric of 3X3 will be created that we call as two -dimensional array

We required a quadratic complexity that is O(n*m) for entering the value in it, Iterating the elements, and even searching

Let’s take an example to explain it in a better way

class ABC {
    public static void main(String[] args)
    {
        int rows = 80, columns = 5;
        int[][] marks = new int[rows][columns];
  
        // initializing the array elements using for loop
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < columns; j++) {
                marks[i][j] = i + j;
            }
        }
  
        // printing the first three rows of marks array
        System.out.println("First three rows are: ");
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < columns; j++) {
                System.out.printf(marks[i][j] + " ");
            }
            System.out.println();
        }
    }
}

Here we have used two for loops for accepting the values and similarly 2 for loops for printing the values which imply that the complexity of the program will be m*n which is quadratic.

 

 

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