Simple Matrix Printing Program

Write a Java Program to print Matrix with or without User Interaction  

 1. Matrix printing without user interaction

public class M1 {
	public static void main(String[] args) 
	{
		int matrix[][] = {{1,2,3}, {4,5,6}, {7,8,9}};
		
		int row = matrix.length;
		int col = matrix[0].length;
		System.out.println("\nMatrix Printing...");
		
		for(int i=0; i<row;i++)
		{			
			for(int j=0; j<col;j++)
				System.out.print(matrix[i][j]+" ");			
			System.out.println();
		}		
	}
}
OUTPUT

Matrix Printing...
1 2 3 
4 5 6 
7 8 9 

 2. Matrix printing Using Scanner (Taking input from user) 

import java.util.Scanner;
public class M2 {
	public static void main(String[] args) {
	 Scanner s = new Scanner(System.in);
	 System.out.println("enter rows");
	 int m = s.nextInt();
	 System.out.println("enter coloumn");
	 int n = s.nextInt();	 
	 int mat[][] = new int[m][n];
	 System.out.println("enter elements..");
	 	for(int i=0; i<m;i++){
			for(int j=0; j<n;j++)
				mat[i][j]=s.nextInt();
		}
	 	System.out.println("................");
	 	for(int i=0; i<m;i++){
			for(int j=0; j<n;j++)
				System.out.print(mat[i][j] +" ");
			System.out.println();
		}
	}
}
OUTPUT

enter rows
3
enter coloumn
3
enter elements..
1
2
3
0
6
5
0
4
7
................
1 2 3 
0 6 5 
0 4 7 

Matrix Addition, Subtraction, Multiplication methods

Matrix elements addition, substraction and multiplication methods  

# Substraction OF MATRIX ELEMENTS USING METHOD

//NOTE:To add matrix elements, rows and coloumns of both matrices must be same. 
import java.util.Scanner;
public class SubMatrix {
	void Matrix()
	{
		Scanner s = new Scanner(System.in);
		 System.out.println("Enter matrix rows");
		 	int m = s.nextInt();
		 System.out.println("Enter matrix coloumn");
		 	int n = s.nextInt();	 
		 	int a[][] = new int[m][n]; 
		 	int b[][] = new int[m][n];
		 	int c[][] = new int[m][n];
		 System.out.println("Enter 1st matrix elements..");
		 	for(int i=0; i<m;i++)
			{
				for(int j=0; j<n;j++)
					a[i][j]=s.nextInt();
			}		 
		 System.out.println("Enter 2nd matrix elements..");
		  for(int i=0; i<m;i++)
			{
				for(int j=0; j<n;j++)
						b[i][j]=s.nextInt();
			}		
		 System.out.println("Substraction of two Matrices");
		 	for(int i=0; i<m;i++)
			{
				for(int j=0; j<n;j++)
					c[i][j]=a[i][j]-b[i][j];
			}
		 	for(int i=0; i<m;i++)
			{
				for(int j=0; j<n;j++)
					System.out.print(c[i][j] +" ");
				System.out.println();
			}
	}
	public static void main(String[] args) 
	{
		SubMatrix obj = new SubMatrix();
		obj.Matrix();
	}
}

OUTPUT

Enter matrix rows
2
Enter matrix coloumn
2
Enter 1st matrix elements..
9
8
7
6
Enter 2nd matrix elements..
4
3
2
1
Substraction of two Matrices
5 5 
5 5 

# ADDITION OF MATRIX ELEMENTS without METHOD(not taking input from user)

public class mAdd {
	public static void main(String[] args) 
	{
		int matrix1[][] = {{7,8,9},{6,5,4},{1,2,3}};
		int matrix2[][] = {{1,2,3},{4,5,6},{7,8,9}};
		int m=matrix1.length;
		int n=matrix1[0].length;
		int add[][]=new int[m][n];
		System.out.println("First matrix elements");
		for(int i=0; i<m;i++)
		{			
			for(int j=0; j<n;j++)
				System.out.print(matrix1[i][j]+" ");			
			System.out.println();
		}
		System.out.println("Second matrix elements");
		for(int i=0; i<m;i++)
		{			
			for(int j=0; j<n;j++)
				System.out.print(matrix2[i][j]+" ");			
			System.out.println();
		}
		System.out.println("Addition of two matrices");
		for(int i=0; i<m;i++)
		{
			for(int j=0; j<n;j++)
				add[i][j]=matrix1[i][j]+matrix2[i][j];
		}
	 	for(int i=0; i<m;i++)
		{
			for(int j=0; j<n;j++)
				System.out.print(add[i][j] +" ");
			System.out.println();
		}
	}
}


OUTPUT

First matrix elements
7 8 9 
6 5 4 
1 2 3 
Second matrix elements
1 2 3 
4 5 6 
7 8 9 
Addition of two matrices
8  10  12  
10  10  10  
8  10  12  

# MULTIPLICATION OF MATRIX ELEMENTS USING METHOD(taking input from user)

//NOTE:To Multiply matrix elements, rows and coloumns of both matrices must be same. 


import java.util.*;
public class MulMatrix {
	void mulMatrix()
	{
		Scanner s = new Scanner(System.in);
		 System.out.println("Enter matrix rows");
		 	int m = s.nextInt();
		 System.out.println("Enter matrix coloumn");
		 	int n = s.nextInt();	 
		 	int a[][] = new int[m][n]; 
		 	int b[][] = new int[m][n];
		 	int c[][] = new int[m][n];
		 System.out.println("Enter 1st matrix elements..");
		 	for(int i=0; i<m;i++)
			{
				for(int j=0; j<n;j++)
					a[i][j]=s.nextInt();
			}		 
		 System.out.println("Enter 2nd matrix elements..");
		  for(int i=0; i<m;i++)
			{
				for(int j=0; j<n;j++)
						b[i][j]=s.nextInt();
			}	
		 System.out.println("Multiplication of two Matrices");
		 	for(int i=0; i<m;i++)
			{
				for(int j=0; j<n;j++)
				{
					c[i][j]=0;
					for(int k=0; k<n; k++)
						c[i][j]+=a[i][k]*b[k][j];
				}
			}
		 	for(int i=0; i<m;i++)
			{
				for(int j=0; j<n;j++)
					System.out.print(c[i][j] +" ");
				System.out.println();
			}
	}
	public static void main(String[] args) 
	{
		MulMatrix obj = new MulMatrix();
		obj.mulMatrix();
	}
}

OUTPUT

Enter matrix rows
3
Enter matrix coloumn
3
Enter 1st matrix elements..
1
2
3
4
5
6
7
8
9
Enter 2nd matrix elements..
9
8
7
6
5
4
3
2
1
Multiplication of two Matrices
30 24 18 
84 69 54 
138 114 90