Java Program to Print the elements of the Matrix in Spiral Form

Spiral matrix in java – Java Program to Print the elements of the Matrix in Spiral Form

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Spiral matrix in java: In the previous article, we have seen Java Program to Print Matrix in Z form

In this article we are going to see how we can write a program to how to print Matrix in spiral from.

Java Program to Print the elements of the Matrix in Spiral Form

A 3*3 Matrix 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 Matrix in spiral from.

Method: Java Program to Print the elements of the Matrix in Spiral Form By Static Initialization of Array Elements

Approach:

  • Initialize and declare a matrix.
  • Traverse the matrix through [0,0] point and traverse by row wise.
  • Take 1st for loop to move from left to right.
  • Take 2nd for loop to move top to bottom.
  • Take 3rd for loop to move right to left.

Program:

import java.util.*;
public class Main 
{
   public static void main(String args[])
   {
      int mat[][]={{10,20,30},{40,50,60},{70,80,90}};
      int a = 0;
      int b = mat.length-1;
      int c = 0;
      int d = mat[0].length-1;
      while(a <= b && c <= d)
      {
         for (int x = a; x <= d; x++) 
         {
            System.out.print(mat[a][x] + " ");
         }
         for (int x = a+1; x <= b; x++)
         {
            System.out.print(mat[x][d] + " ");
         }
         if(a+1 <= b)
         {
            for (int x = d-1; x >= c; x--) 
            {
               System.out.print(mat[b][x] + " ");
            }
         }
         if(c+1 <= d)
         {
            for (int x = b-1; x > a; x--) 
            {
               System.out.print(mat[x][c] + " ");
            }
         }
         a++;
         b--;
         c++;
         d--;
      }
   }
}

Output:

10 20 30 60 90 80 70 40 50

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