Sparse array ^ create ^ restore ^ save ^ fetch -- family bucket

package com.Cx_330.run;

import org.junit.Test;

import java.io.*;
import java.math.BigDecimal;
import java.nio.charset.StandardCharsets;
import java.util.*;


public class CCC {
    public static void main(String[] args) throws Exception {
        int[][] arr=new int[9][9];
        arr[2][2]=1;
        arr[3][3]=2;
        arr[4][4]=1;
        arr[5][5]=2;
        int sum=0;
        for (int[] i:arr){
            for (int j:i){
                if(j!=0){
                    sum++;
                }
                System.out.print(j+" ");
            }
            System.out.println();
        }
        int[][] str=new int[sum+1][3];
        str[0][0]=arr.length;
        str[0][1]=arr[0].length;
        str[0][2]=sum;
        int count=1;
        for (int i = 0; i < arr.length; i++) {
            for (int i1 = 0; i1 < arr[0].length; i1++) {