public class ArrayTest {
    public static void main(String[] args) {
        int[][] array1 = new int[11][11];
        array1[1][2] = 1;
        array1[2][3] = 2;
        array1[4][5] = 1;
        /*输出原始数组*/
        System.out.println("输出原始数组：");
        for (int[] ints : array1) {
            for (int anInt : ints) {
                System.out.print(anInt+"\t");
            }
            System.out.println();
        }
        System.out.println("====================================================================");
        /*转换为稀疏数组来保存*/
        /*获取有效值的个数*/
        int sum = 0;
        for (int i = 0; i < array1.length; i++) {
            for (int j = 0; j < array1.length; j++) {
                if (array1[i][j] != 0){
                    sum ++;
                }
            }
        }
        System.out.println("有效值的个数:"+sum);

        /*创建一个稀疏数组的数组*/
        int[][] array2 = new int[sum+1][3];
        array2[0][0] = array1.length;
        array2[0][1] = array1.length;
        array2[0][2] = sum;

        //遍历二维数组，将非零的值存放到稀疏数组中
        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];
                }
            }
        }
        //输出稀疏数组
        System.out.println("稀疏数组:");
        for (int i = 0; i < array2.length; i++) {
            System.out.println(array2[i][0]+"\t"+array2[i][1]+"\t"+array2[i][2]);
        }
    }
}

运行结果为：