稀疏数组

public class Demo07 {
    public static void main(String[] args) {
        //1\创建一个二维数组 11*11  0：没有棋子   1：黑棋    2：白棋
        int[][] array1 = new int[11][11];
        array1[1][2] = 1;
        array1[2][3] = 2;
        //输出原始的数组
        System.out.println("输出原始的数组");
        for (int[] ints : array1) {
            for (int anInt : ints) {
                System.out.print(anInt+"\t");
            }
            System.out.println();
        }
        System.out.println("==========================================");
        //转换为稀疏数组保存
        //获取有效值的个数
        int sum = 0;
        for (int i = 0; i < 11; i++) {
            for (int j = 0; j < 11; j++) {
                if (array1[i][j]!=0) {
                    sum++;
                }
            }
        }
        System.out.println("有效值的个数："+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，将非零的值，存放稀疏数组中
        int count = 0;
        for (int i = 0; i < array1.length; i++) {
            for (int j = 0; j < array2.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]+"\t");

        }
        System.out.println("==========================================");
        System.out.println("还原");
        //1、读取稀疏数组
        int[][] array3 = new int[array2[0][0]][array2[0][1]];

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

        }
        //3、打印还原一下
        System.out.println("输出一个还原的数组");

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

            }
            System.out.println();

        }

    }
}

稀疏数组

原文：https://www.cnblogs.com/mianji/p/14090879.html