稀疏数组

package com.yang.array;

public class ArrayDemo07 {
    public static void main(String[] args) {
        //1.创建一个二维数组
        int[][] array1 = new int[11][11];
        array1[1][2] = 1;
        array1[2][3] = 2;
        //输出原始的数据
        System.out.println("输出原始的数据");

        for (int[] ints : array1){
            for (int anINT : ints){
                System.out.print(anINT+"\t");
            }
            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 < 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 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[] ints : array3){
            for (int anINT : ints){
                System.out.print(anINT+"\t");
            }
            System.out.println();
        }





    }
}