Java program to Multiply two Matrices

Write a Java program to multiply two Matrices with an example. Or write a Java program to perform multiplication of two multidimensional arrays.

In this Java multiply example, we declared two integer matrices. Next, we used the For Loop to iterate those values. Then we performed matrix multiplication on x and y matrixes within that loop and assigned it to another one called multi. Later, we used another for loop to print the final output.

public class MultiplyTwoMatrix {

	public static void main(String[] args) {
		int[][] x = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
		int[][] y = {{ 5, 6, 7}, {8, 9,10}, {2,3, 4}};
		
		int[][] multi = new int[3][3];
		int i, j;
		
		for(i = 0; i < x.length; i++)
		{
			for(j = 0; j < x[0].length; j++)
			{
				multi[i][j] = x[i][j] * y[i][j];
			}
		}
		System.out.println("------ The Multiplication of two Matrix ------");
		
		for(i = 0; i < x.length; i++)
		{
			for(j = 0; j < x[0].length; j++)
			{
				System.out.format("%d \t", multi[i][j]);
			}
			System.out.println("");
		}
	}
}

Java program to Multiply two Matrices example 2

This Java matrix multiplication program is the same as above. However, this Java code allows the user to enter the rows, columns, and the matrix items.

import java.util.Scanner;

public class MultiplyTwoMatrix {
	private static Scanner sc;
	public static void main(String[] args) {
		int i, j, rows, columns;
		
		sc= new Scanner(System.in);
		
		System.out.println("\n Enter Rows & Columns :  ");
		rows = sc.nextInt();
		columns = sc.nextInt();
		
		int[][] arr1 = new int[rows][columns];
		int[][] arr2 = new int[rows][columns];
		
		System.out.println("\n Enter the First Mat Items :  ");
		for(i = 0; i < rows; i++) {
			for(j = 0; j < columns; j++) {
				arr1[i][j] = sc.nextInt();
			}		
		}
		System.out.println("\n Enter the Second Mat Items :  ");
		for(i = 0; i < rows; i++) {
			for(j = 0; j < columns; j++) {
				arr2[i][j] = sc.nextInt();
			}		
		}
		System.out.println("\n-----The Multiplication of two Matrix----- ");
		for(i = 0; i < rows; i++) {
			for(j = 0; j < columns; j++) {
				System.out.format("%d \t", (arr1[i][j] * arr2[i][j]));
			}
			System.out.println("");
		}
	}
}

 Enter Rows & Columns :  
3 3

 Enter the First Mat Items :  
1 2 3
4 5 6
7 8 9

 Enter the Second Mat Items :  
10 20 30
40 50 60
70 80 90

-----The Multiplication of two Matrix----- 
10 	40 	90 	
160 	250 	360 	
490 	640 	810