Java Program to Print 33 Matrix

How to print a matrix in java – Java Program to Print 3*3 Matrix

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××How to print matrix in java: In this article we are going to see how we can write a program to print 3*3 Matrix in JAVA language and java program to print matrix or java print matrix.

Java Program to Print 3*3 Matrix

How to print 3*3 matrix in java: A 3*3 Matrix program in java is having 3 rows and 3 columns where this 3*3 represents the dimension of the matrix. Means there are 3*3 i.e. total 9 elements in a 3*3 Matrix.

Let’s understand it in more simpler way.

                   | A00   A01   A02 |
Matrix A =  | A10   A11   A12 |
                   | A20   A21   A22 | 3*3
  • Matrix A represents a 3*3 matrix.
  • ‘A‘ represents the matrix element
  • ‘Aij‘ represents the matrix element at it’s matrix position/index.
  • ‘i‘ represents the row index
  • ‘j‘ represents the column index
  • Means A00=Aij  where i=0 and j=0,  A01=aij where i=0 and j=1 and like this.
  • Here we have started row value from 0 and column value from 0.

Let’s see different ways to print 3*3 matrix.

Method-1: Java Program to Print 3*3 Matrix By Static Initialization of Array Elements

Approach:

  • Initialize and declare an array of size 3×3 matrix in java with array elements.
  • Use two for loops to iterate the row and column indexes, and output the array elements.

Program:

public class matrix{
    public static void main(String args[])
    {
        int arr[][] = {{1,2,3},{4,5,6},{7,8,9}};
        int row, col;
        System.out.print("The 3x3 matrix elements are : ");
        
        // Loop to print the elements
        for(row=0;row<3;row++)
        {
            // Used for formatting
            System.out.print("\n");
            for(col=0;col<3;col++)
            {
                System.out.print(arr[row][col]+" ");
            }
        }
        
    }
}

Output:

The 3x3 matrix elements are : 
1 2 3 
4 5 6 
7 8 9

Method-2: Java Program to Print 3*3 Matrix By Dynamic Initialization of Array Elements

Approach:

  • Initialize an array of size 3×3.
  • Ask the user for input.
  • Use two for loops to iterate the row and column indexes, and input the array elements.
  • Similarly use two for loops to output the array elements.

Program:

import java.util.Scanner;

public class Matrix
{
    public static void main(String args[])
    {
        //Scanner class to take input
        Scanner scan = new Scanner(System.in);

        int arr[][] = new int[3][3];

        System.out.print("Enter the 3x3 matrix elements :");
        int row, col;
        // Loop to take user input
        for(row=0;row<3;row++)
            for(col=0;col<3;col++)
                arr[row][col] = scan.nextInt();
        
        System.out.print("The 3x3 matrix elements are : ");
        

        // Loop to print the elements
        for(row=0;row<3;row++)
        {
            // Used for formatting
            System.out.print("\n ");
            for(col=0;col<3;col++)
            {
                System.out.print(arr[row][col]+" ");
            }
        }
        
    }
}

Output:

Enter the 3x3 matrix elements : 10 20 30 40 50 60 70 80 90
The 3x3 matrix elements are : 
10 20 30 
40 50 60 
70 80 90

Methoid-3: Java Program to Print 3*3 Matrix By Using toString() method

Approach:

  • Initialize an array of size 3×3 or 3×3 array java.
  • Ask the user for input.
  • Use two for loops to iterate the row and column indexes, and input the array elements.
  • Then iterate each row of matrix and print each row of matrix, convert it to String and then print it in separate lines.

Program:

import java.util.*;
import java.io.*;

public class Matrix
{
    public static void main(String args[])
    {
        //Scanner class to take input
        Scanner scan = new Scanner(System.in);

        int arr[][] = new int[3][3];

        System.out.print("Enter the 3x3 matrix elements :");
        int row, col;
        // Loop to take user input
        for(row=0;row<3;row++)
            for(col=0;col<3;col++)
                arr[row][col] = scan.nextInt();
        
        System.out.println("The 3x3 matrix elements are : ");
        
        //printing the matrix
        // loop to cover all rows
        for (int[] r : arr)
 
            // first it converts each row as string using toString() method
            // and then prints that string in a separate line
            System.out.println(Arrays.toString(r));
    }
}

Output:

Enter the 3x3 matrix elements : 10 20 30 40 50 60 70 80 90

The 3x3 matrix elements are : 
[10, 20, 30]
[40, 50, 60]
[70, 80, 90]

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