java小练习：稀疏数组的建立与还原

代码展示如下： 

package array;

import java.util.Scanner;

public class SparseArrayScanner {
    public static void main(String[] args) {
        //创建一个二维数组 11*11
        Scanner s = new Scanner(System.in);
        System.out.println("请输入一个3*3数组：");
        int[][] array1 = new int[3][3];

        for(int i=0;i< 3;i++) {
            for (int j = 0; j < 3; j++) {
                array1[i][j] = s.nextInt();
            }
        }


            //输出原始数组
        System.out.println("打印原始数组");

        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
        //获得有效值个数
        int sum =0;
        for (int i=0;i<3;i++){
            for (int j=0;j<3;j++){
                if (array1[i][j]!=0){
                    sum++;
                }
            }
        }
        System.out.println("有效的个数："+sum);

        //创建一个稀疏数组
        int[][] array2 = new int [sum+1][3];

        array2[0][0]=3;
        array2[0][1]=3;
        array2[0][2]=sum;

        //遍历二维数组，将非零的值放在稀疏数组中
        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");
        //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
        System.out.println("打印原始数组");

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