二维数组与稀疏数组的相互转化

package struct;

public class SparseArr {
    public static void main(String[] args) {
        int chess[][] = new int[11][11];
        //0代表空白，1代表黑子，2代表蓝子
        chess[1][2] = 1;
        chess[2][3] = 2;
        int sum = 0;
        //获取有效值个数
        for (int[] rows : chess) {
            for (int data : rows) {
                System.out.printf("%d	", data);
                if (data != 0) {
                    sum++;
                }
            }
            System.out.println();
        }
        //创建稀疏数组
        int[][] sparseArr = new int[sum + 1][3];
        //给稀疏数组赋值
        sparseArr[0][0] = 11;//棋盘的行数
        sparseArr[0][1] = 11;//棋盘的列数
        sparseArr[0][2] = sum;//棋盘上的棋子个数
        //二维数组的长度为行数
        int count = 1;
        for (int i = 0; i < chess.length; i++) {
            for (int j = 0; j < chess[0].length; j++) {
                if (chess[i][j] != 0) {
                    sparseArr[count][0] = i;
                    sparseArr[count][1] = j;
                    sparseArr[count][2] = chess[i][j];
                    count++;
                }
            }
        }
        //输出稀疏数组
        for (int i = 0; i < sparseArr.length; i++) {
            System.out.printf("%d	%d	%d	
", sparseArr[i][0], sparseArr[i][1], sparseArr[i][2]);
        }
        //还原二维数组
        int[][] chess1Arr = new int[sparseArr[0][0]][sparseArr[0][1]];
        //给二维数组赋值
        for (int i = 1; i < sparseArr.length; i++) {
            for (int j = 0; j < sparseArr[0].length; j++) {
                chess1Arr[sparseArr[i][0]][sparseArr[i][1]] = sparseArr[i][2];
            }
        }
        //输出二维数组
        for (int i = 0; i < chess1Arr.length; i++) {
            for (int j = 0; j < chess1Arr[0].length; j++) {
                System.out.printf("%d	", chess1Arr[i][j]);
            }
            System.out.println();
        }
    }
}