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Write a program to print a matrix pattern

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

public class MatrixPattern
{
 public static void main(String a[]) throws IOException
 {
  System.out.println("Welcome to the MatrixPattern project!");  
        double [][] arr1 = new double [3][3];
        double [][] arr2 = new double [3][6];
       
        Scanner input = new Scanner(System.in);
        int i=0,j=0,k=0;
     
        for(i=0;i<3;i++){
            for(j=0;j<3;j++){
                arr1[i][j]=input.nextDouble();
            }
        }
     
        for(i=0;i<3;i++){
            for(j=0;j<3;j++){
                arr2[i][2*j]=arr1[i][j];
            }
            for(j=0;j<3;j++){
arr2[i][2*j+1]=arr1[i][j];
}
        }
     
       
     
        for(i=0;i<3;i++){
            for(j=0;j<6;j++){
                System.out.print(arr2[i][j]+"\t");
            }
            System.out.println();
        }
 }

}

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