Java Program to Find Number of Rectangles in N*M Grid

public class Main
{ 
    // Driver method
    public static void main(String[] args)  
    { 
       //Value of 'n' and 'm' are declared
       int n = 2, m = 2; 
       //calling the rectangleCount() user defined method
       System.out.println("Number of rectangle : "+rectangleCount(n, m)); 
    } 
    
    //rectangleCount() method to find the number of rectangles  
    public static long  rectangleCount(int n, int m) 
    { 
        return (m * n * (n + 1) * (m + 1)) / 4; 
    } 
}

Output:

Number of rectangle : 9