Matrix.java

import java.io.*; 

class Matrix { 
	

	static int N = 4; 
	static void multiply(int mat1[][], 
				int mat2[][], int res[][]) 
	{ 
		int i, j, k; 
		for (i = 0; i < N; i++) 
		{ 
			for (j = 0; j < N; j++) 
			{ 
				res[i][j] = 0; 
				for (k = 0; k < N; k++) 
					res[i][j] += mat1[i][k] 
								* mat2[k][j]; 
			} 
		} 
	} 
	public static void main (String[] args) 
	{ 
		int mat1[][] = { {1, 1, 1, 1}, 
						{2, 2, 2, 2}, 
						{3, 3, 3, 3}, 
						{4, 4, 4, 4}}; 

		int mat2[][] = { {1, 1, 1, 1}, 
						{2, 2, 2, 2}, 
						{3, 3, 3, 3}, 
						{4, 4, 4, 4}}; 

		int res[][] = new int[N][N] ; 
		int i, j; 
		multiply(mat1, mat2, res); 
	
		System.out.println("Result matrix"
								+ " is "); 
		for (i = 0; i < N; i++) 
		{ 
			for (j = 0; j < N; j++) 
				System.out.print( res[i][j] 
									+ " "); 
			System.out.println(); 
		} 
	} 
}