MatrixAdd.java

package Arrays;
import java.util.Arrays;

public class MatrixAdd {
	public static void main(String[] args) {

	int [][]a= {{1,2,3},
			    {4,5,6},
			    {7,8,9}
			    };
	int [][]b= {{1,2,3},
			    {4,5,6},
			    {7,8,9}};
	
	 int [][]c=new int[a.length][a[0].length];
	 System.out.println("Addition Of Array Matrix");
	 add(a,b,c);
	 for(int i=0;i<c.length;i++) {
    	 System.out.println(Arrays.toString(c[i]));
	 }
	 System.out.println("Matrix Multiplication");
	int [][]d= multi(a,b);
	 for(int i=0;i<d.length;i++) {
    	 System.out.println(Arrays.toString(d[i]));
	 }
	 
	 
}
	 public static void add(int [][]a,int [][]b,int [][]c) {
     for(int i=0;i<a.length;i++) { 	
    	 for(int j=0;j<a[0].length;j++) {
    		 c[i][j]=a[i][j]+b[i][j];
       }
     }
   }
	 
	 public static int [][]multi(int [][]a,int [][]b) {
		  if(a[0].length==b.length) { 
			  int [][]d=new int[a.length][a[0].length];
		 for(int i=0;i<a.length;i++) {
			 for(int j=0;j<b[0].length;j++) {
				 int sum=0;
				 for(int k=0;k<b.length;k++) {
					 sum+=a[i][k]*b[k][j];
				 }
				 d[i][j]=sum;
			 }
		 }
		 return d;
		}
		 return null;
	 }
}