java简单稀疏数组demo

public class ArrayDemo08 {
    public static void main(String[] args) {
        //创建一个二维数组棋盘 11* 11  1：黑棋   2：白棋
        int[][] array1 = new int[11][11];
        array1[1][2] = 1;
        array1[2][3] = 2;
        //输出原始数组
        for (int[] anInt:array1) {
            for (int ints:anInt) {
                System.out.print(ints+"\t");
            }
            System.out.println();
        }

        System.out.println("=================================================");

        //转换为稀疏数组保存
        //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("有效值的个数为："+ 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[i].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[] a2:array2) {
            for (int b2:a2) {
                System.out.print(b2 + "\t");
            }
            System.out.println();
        }

        System.out.println("输出稀疏数组的第二种方法=======================");
        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("还原稀疏数组：");

        //1.读取稀疏数组
        int[][] array3 = new int[array2[0][0]][array2[0][1]];

        //2.给其中的元素还原它的值
        for (int i = 1; i < array2.length; i++) {
            array3[array2[i][0]][array2[i][1]] = array2[i][2];
        }

        //3.打印
        System.out.println("输出还原的数组：");
        for (int[] c1:array3) {
            for (int c2:c1) {
                System.out.print(c2 + "\t");
            }
            System.out.println();
        }



    }

}