public class SudokuChecker{ static int[][] sMatrix={                    {5,3,4,6,7,8,9,1,2},                    {6,7,2,1,9,5,3,4,8},                    {1,9,8,3,4,2,5,6,7},                    {8,5,9,7,6,1,4,2,3},                    {4,2,6,8,5,3,7,9,1},                    {7,1,3,9,2,4,8,5,6},                    {9,6,1,5,3,7,2,8,4},                    {2,8,7,4,1,9,6,3,5},                    {3,4,5,2,8,6,1,7,9}                };static int rSum=0;static int cSum=0;static int[] rSumArray=new int[9];static int[] cSumArray=new int[9];static int[] boxSumArray=new int[9];static boolean checkArrayStatus(int[] rSumArray,int[] cSumArray,int[] boxSumArray){       int i=0;    boolean sudukoStatus=true;    while(i<9){        if(rSumArray[i]!=45&&cSumArray[i]!=45&&rSumArray[i]!=45)        {               sudukoStatus=false;            break;        }        i++;    }    return sudukoStatus;}       public static void main(String[] args) {        for(int i=0 ; i<sMatrix.length ; i++){            for(int j=0 ; j<sMatrix.length ; j++){                rSum+=sMatrix[i][j];                cSum+=sMatrix[j][i];                }            rSumArray[i]=rSum;            cSumArray[i]=cSum;            rSum=0;            cSum=0;        }        for(int i=0 ; i< sMatrix.length ; i++){            for(int j=0 ; j<sMatrix.length ; j++){                if(i<=2&&j<=2)                {                    boxSumArray[0]+=sMatrix[i][j];                }                if(i<=2&&(j>=3&&j<=5))                {                    boxSumArray[1]+=sMatrix[i][j];                }                if(i<=2&&(j>=6&&j<=8))                {                    boxSumArray[2]+=sMatrix[i][j];                }                if((i>=3&&i<=5)&&(j<=2))                {                    boxSumArray[3]+=sMatrix[i][j];                }                if((i>=3&&i<=5)&&(j>=3&&j<=5))                {                    boxSumArray[4]+=sMatrix[i][j];                }                if((i>=3&&i<=5)&&(j>=6&&j<=8))                {                    boxSumArray[5]+=sMatrix[i][j];                }                if((i>=6)&&(j<=2))                {                    boxSumArray[6]+=sMatrix[i][j];                }                if((i>=6)&&(j>=3&&j<=5))                {                    boxSumArray[7]+=sMatrix[i][j];                }                if((i>=6)&&(j>=6))                {                    boxSumArray[8]+=sMatrix[i][j];                }            }        }        if(checkArrayStatus(rSumArray,cSumArray,boxSumArray))        {            System.out.println(The matrix is sudoku compliant);        }        else        {            System.out.println(The matrix is not sudoku compliant);        }    }}This a program which verifies if a 2D matrix is a Sudoku or not. The sum of every row, column and 3x3 matrices have to be 45.  Please review the code and provide feedback on best practices and code optimization. 
Sudoku Checker in Java
java;validation;sudoku