[JAVA] CH7 2-Dimensional Array

import java.util.Scanner;
 
public class MagicSquares
{
    public static int userInput;
    private static int g,c;
    public int[][] matrix;
    private int ROW = 3;
    private int COLUMNS = 3;
    private int x,z,m,a,b,d;
    private int sumHolizontal;
    private int sumVertical;
    private int sumCross;
    public static boolean booleanVar;
    public MagicSquares()
    {
        matrix = new int [ROW][COLUMNS];
        userInput = 0;
        m=1; a=0; b=0; c=0; d=1;
 
    }
 
    public static int getUserInput()
    {
        System.out.println("Enter a number : ");
        Scanner sc = new Scanner(System.in);
        return sc.nextInt();
    }
    public void add(int i)
    {
        matrix[z][x] = i;
        ++x;
        if(x == 3)
        {   z++; x=0;   }
        m++;
    }
 
    public void printData()
    {
        if(d==3)
        {   System.out.println(" "+matrix[a][b]);   }
        else
        {   System.out.print(" "+matrix[a][b]);   }
        ++b;
        if(b == 3)
        {   a++; b=0; d=0;  }
        d++;
    }
 
    public boolean isMagic()
    {
        sumHolizontal = matrix[0][0] + matrix[0][1] + matrix[0][2];
        sumVertical = matrix[0][0] + matrix[1][0] + matrix[2][0];
        sumCross = matrix[0][0] + matrix[1][1] + matrix[2][2];
        return sumHolizontal == sumVertical;
    }
 
    public static void main(String[] args)
    {
        MagicSquares ms = new MagicSquares();
        for(g = 0; g< 9; g++)
        {
            userInput = getUserInput();
            ms.add(userInput);       
        }
 
        /**
           using a for loop print number
        */
        System.out.println();
        System.out.println("*** Algolism list ***");
        for(c = 0; c<9;c++)
        { ms.printData(); }
        /**
            check bool
        */
        booleanVar = ms.isMagic();
        System.out.println("This is a Magic Squares : "+booleanVar);
    }
}