Sparse array → saving and continuation of Gobang

Sparse array can be used to record the storage of Gobang , Continue disk and other operations

public class WZQ {
    
    public static void main(String[] args) {
    
        //1. Create a 2D array 11*11 0： No chess pieces  1： Black chess  2： White chess 
        int[][] array1 = new int[11][11];
        array1[1][2] = 1;
        array1[2][3] = 2;
        // Output original array 
        System.out.println(" Output original array ");
        //array1.for
        for (int[] ints : array1) {
    
            //ints.for
            for (int anInt : ints) {
    
                System.out.print(anInt + "\t");
            }
            System.out.println();
        }

        System.out.println("===========================");
// Convert to sparse array to save 
//  Get the number of valid values 
                int sum=0;
                for(int i=0;i<11;i++)
        for(int j=1;j<11;j++) {
    
            if (array1[i][j] != 0) {
    
                sum++;
            }
        }
                System.out.println(" The number of valid values is ："+sum);
        //2. Create an array of sparse arrays 
        int[][]array2=new int[sum+1][3];
        array2[0][0]=11;
        array2[0][1]=11;
        array2[0][2]=sum;
        // Traversing sparse arrays , Will be a non-zero value , Stored in a sparse array 
        int count=0;
        for (int i = 0; i< array1.length; i++) {
    
            for (int j= 0; j <array1.length ; j++) {
    
                if(array1[i][j]!=0){
    
                    count++;
                    array2[count][0]=i;
                    array2[count][1]=j;
                    array2[count][2]=array1[i][j];
                }
            }
        }
        // Output sparse array 
        System.out.println(" Output sparse array ");
        for (int i = 0; i < array2.length; i++) {
    
            System.out.println(array2[i][0]+"\t"+array2[i][1]+"\t"+array2[i][2]+"\t");
        }
        System.out.println("=====================");
        System.out.println(" Restore ");
        //1. Read sparse arrays 
        int[][]array3=new int[array2[0][0]][array2[0][1]];
        //2. Restore its value to one of its elements 
        for (int i = 1; i <array2.length ; i++) {
    
            array3[array2[i][0]][array2[i][1]]=array2[i][2];
        }
        //3. Print 
        System.out.println(" Restore the original array ");
        //array1.for
        for (int[] ints : array3) {
    
            //ints.for
            for (int anInt : ints) {
    
                System.out.print(anInt + "\t");
            }
            System.out.println();
        }
        }
}

Running results ：