稀疏数组

package BASE;

public class xishushuzu {
    public static void main(String[] args) {


        //1.创建一个二维数组11*11  
        int[][] array1=new int[11][11];
        array1[1][2] = 1;
        array1[2][3] = 2;
        System.out.println("输出原始数组");

        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，将非零值存放在稀疏数组中
        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");
        //1.读取稀疏数组
        int[][] array3 = new int[array2[0][0]][array2[0][1]];
        //2.给其中元素还原值
        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();
        }

    }
}