二维数组与稀松数组之间转换

public class Test1 {
    public static void main(String[] args) {
        int arr1[][]=new int[10][10];
        arr1[1][1]=1;
        arr1[2][3]=2;
        arr1[4][2]=1;
        System.out.println("原始二维数组");
        for (int[] row:arr1
             ) {
            for (int data:row
                 ) {
                System.out.printf("%d\t",data);
            }
            System.out.println();
        }

        int sum=0;
        for (int i = 0; i <10 ; i++) {
            for (int j = 0; j <10 ; j++) {
                if (arr1[i][j]!=0){
                    sum++;
                }
            }
        }
        //稀松数组
        System.out.println("稀松数组");
        int sarr[][]=new int[sum+1][3];
        sarr[0][0]=10;
        sarr[0][1]=10;
        sarr[0][2]=sum;
        int count=0;
        for (int i = 0; i <10 ; i++) {
            for (int j = 0; j <10 ; j++) {
                if (arr1[i][j]!=0){
                    count++;
                    sarr[count][0]=i;
                    sarr[count][1]=j;
                    sarr[count][2]=arr1[i][j];
                }
            }
        }
        for (int[] row:sarr
        ) {
            for (int data:row
            ) {
                System.out.printf("%d\t",data);
            }
            System.out.println();
        }

        System.out.println("稀松转二维");
        int arr2[][]=new int[sarr[0][0]][sarr[0][1]];

        for (int i = 1; i <sarr.length ; i++) {
            arr2[sarr[i][0]][sarr[i][1]]=sarr[i][2];
        }
        for (int[] row:arr2
             ) {
            for (int data:row
                 ) {
                System.out.printf("%d\t",data);
            }
            System.out.println();
        }
    }
}

输出如下

原始二维数组
0    0    0    0    0    0    0    0    0    0    
0    1    0    0    0    0    0    0    0    0    
0    0    0    2    0    0    0    0    0    0    
0    0    0    0    0    0    0    0    0    0    
0    0    1    0    0    0    0    0    0    0    
0    0    0    0    0    0    0    0    0    0    
0    0    0    0    0    0    0    0    0    0    
0    0    0    0    0    0    0    0    0    0    
0    0    0    0    0    0    0    0    0    0    
0    0    0    0    0    0    0    0    0    0    
稀松数组
10  10    3    
1    1    1    
2    3    2    
4    2    1    
稀松转二维
0    0    0    0    0    0    0    0    0    0    
0    1    0    0    0    0    0    0    0    0    
0    0    0    2    0    0    0    0    0    0    
0    0    0    0    0    0    0    0    0    0    
0    0    1    0    0    0    0    0    0    0    
0    0    0    0    0    0    0    0    0    0    
0    0    0    0    0    0    0    0    0    0    
0    0    0    0    0    0    0    0    0    0    
0    0    0    0    0    0    0    0    0    0    
0    0    0    0    0    0    0    0    0    0