java稀疏数组

  public static void main(String[] args) {
        //创建一个二维数组 11*11  0 没有棋子 1黑子 2白子
        int[][] array = new int[11][11];
        array[1][2]=1;
        array[2][3]=2;
        //输出原始数组
        System.out.println("输出原始数组");

        for (int[] ints : array){
            for (int anInt : ints) {
                System.out.print(anInt+"\t");
            }
            System.out.println();
        }
        //转换为稀疏数组
        int sum = 0;
        for (int i = 0; i < 11; i++) {
            for (int j = 0; j < 11; j++) {
                if (array[i][j]!=0){
                    sum++;
                }
            }
        }
        System.out.println("有效的个数"+sum);
        //2创建一个稀疏数组的数组
        int[][] array2 = new int [sum+1][3];
        array2[0][0] = 11;
        array2[0][1] = 11;
        array2[0][2] = sum;

        //遍历二维数组，将非零的数，存放在稀疏数组中
        int count = 0;
        for (int i = 0; i < array.length; i++) {
            for (int j = 0; j < array[i].length; j++) {
                if (array[i][j]!=0){
                    count++;
                    array2[count][0]=i;
                    array2[count][1]=j;
                    array2[count][2]=array[i][j];
                }
            }
        }
        //输出稀疏数组
        for (int i = 0; i < array2.length; i++) {
            System.out.println(array2[i][0]+"\t"
            +array2[i][1]+"\t"
            +array2[i][2]+"\t");
        }
        //1读取系数数组的值
        int[][] array3 =new int[array2[0][0]][array2[0][1]];
        //2给其中的元素还原值
        for (int i = 1; i < array2.length; i++) {
            array3[array2[i][0]][array2[i][1]] = array2[i][2];
        }
        //3打印
        System.out.println("输出还原数组");

        for (int[] ints : array3){
            for (int anInt : ints) {
                System.out.print(anInt+"\t");
            }
            System.out.println();
        }
    }
}