Java数组学习心得（稀疏数组）

//包括稀疏数组的储存及还原

import java.util.Arrays;

public class ArrayDemo08 {
    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;
        //输出原始数组

        for (int[] ints : array1) {//array1.for
            for (int anInt : ints) {//ints.for
                System.out.print(anInt+" ");
            }
            System.out.println();
        }
        System.out.println("================================");
        //转换为稀疏数组保存
        //获取有效值的个数  s
        int s = 0;
        for (int i = 0; i < 11; i++) {
            for (int j = 0; j < 11; j++) {
                if (array1[i][j]!=0){
                    s++;
                }
            }
        }
        System.out.println("有效值的个数s为"+s);
        //2.创建一个稀疏数组
        int[][] array2 = new int[s+1][3];
        array2[0][0]=11;
        array2[0][1]=11;
        array2[0][2]=2;
        //遍历二维数组，将非0的值，存放稀疏数组中
        int count = 0;
        for (int i = 0;i
            for (int j = 0 ;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("输出稀疏数组");
        for (int i = 0 ;i
            System.out.println(array2[i][0]+"t"
                                +array2[i][1]+"t"
                                +array2[i][2]+"t"
            );
        }
        System.out.println("===============================");
        //还原稀疏数组
        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]  ];
        //给其中的元素还原它的值：
        for (int i = 1;i
            array3[   array2[i][0]   ] [   array2[i][1]   ]=array2[i][array2.length-1];
        }

//        array3[1][2]=1;
//        array3[2][3]=2;
        //输出稀疏数组还原后的数组：
        System.out.println("输出稀疏数组还原后的数组：");

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

    }
}