day05 java数组 稀疏数组

java数组

稀疏数组

 public static void main(String[] args) {
    //1.创建一个二维数组 11*11 0：没棋子 1：黑棋 2：白棋int[][] array1 = new int[11][11];array1[1][2] = 1;array1[2][3] = 1;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("有效值个数" + sum);//2.创建稀疏数组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，将非零的值放入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("==============");//还原//1.读取int[][] array3 = new int[array2[0][0]][array2[0][1]];//2.还原值for (int i = 1; i < array2.length; i++) {
    array3[array2[i][0]][array2[i][1]] = array2[i][2];}//i从1开始//打印System.out.println("输出还原数组：");for (int[] ints : array3) {
    for (int anInt : ints) {
    System.out.print(anInt + "\t");}System.out.println();}}