韩顺平稀疏数组课后作业1

在前面的基础上把棋盘数据通过IO写入和读取出来

代码实现：

package SparseArray;

import java.io.*;
import java.util.ArrayList;

/**
 * author：mg
 * 案例：用稀疏数组存储棋盘
 */
public class HomeWorkSparseArr {
    public static void main(String[] args) throws IOException {
        //存储一个11*11的棋盘
        //0表示没棋子 1表示黑子 2表示蓝子
        int chessArr1[][] = new int[11][11];
        chessArr1[1][2] = 1;
        chessArr1[2][3] = 2;
        System.out.println();
        System.out.println("原始的二维数组：");
        for (int[] row : chessArr1) {
            for (int data : row) {
                System.out.printf("%d\t",data);
            }
            System.out.println();
        }
        int sum = 0;
        for (int i = 0; i < 11; i++) {
            for(int j = 0; j < 11; j++){
                if(chessArr1[i][j]!=0){
                    sum++;//有多少个不为0的数
                }
            }
        }

        int sparseArr[][] = new int [sum+1][3];
        sparseArr[0][0] = 11;
        sparseArr[0][1] = 11;
        sparseArr[0][2] = sum;
        int count = 0;//定义一个递增的数记录数据
        for (int i = 0; i < 11; i++) {
            for (int j = 0; j < 11; j++) {
                if(chessArr1[i][j]!=0){
                    count++;
                    sparseArr[count][0] = i;
                    sparseArr[count][1] = j;
                    sparseArr[count][2] = chessArr1[i][j];
                }
            }
        }

        System.out.println();
        System.out.println("稀疏数组：----");
        for (int i = 0; i < sparseArr.length; i++) {
            System.out.printf("%d\t%d\t%d\t\n",sparseArr[i][0],sparseArr[i][1],sparseArr[i][2]);
        }
        /**
         * 把棋盘数据写入map.data文件中
         */
        System.out.println("把稀疏数组写入map.data");
        File file = new File("D:\\IDEA代码\\DataStructure\\src\\SparseArray\\map.data");
        FileWriter fw = new FileWriter(file);
        for (int i = 0; i < sparseArr.length; i++) {
            for(int j = 0; j<3;j++){
                fw.write(sparseArr[i][j]+"\t");
            }
        }
        fw.close();

        System.out.println("写入成功！");

        /**
         * 读取map.data文件将稀疏数组读回来
         */
        ArrayList<Integer> list = new ArrayList<>();
        BufferedReader br = new BufferedReader(new FileReader("D:\\IDEA代码\\DataStructure\\src\\SparseArray\\map.data"));
        String s = null;
        while((s = br.readLine())!=null){
            String[] temp = s.split("\t");
            for(String s1:temp){
                int i = Integer.parseInt(s1);
                list.add(i);
            }
        }
        int row = list.get(0);//读取行
        int col = list.get(1);//读取列
        int[][] chessArr2 = new int[row][col];
        //给棋盘赋值数据
        for(int i = 3;i<list.size();i++){
            if(i%3==0){
                chessArr2[list.get(i)][list.get(i+1)] = list.get(i+2);
            }
        }
        br.close();
        /**
         * 稀疏数组还原为11*11的二维数组
         */
        System.out.println("已经成功读取棋盘数据");
        for (int[] a : chessArr2) {
            for (int data : a) {
                System.out.printf("%d\t",data);
            }
            System.out.println();
        }

    }
}