稀疏数组

将数组导入java待完善

package datastructure;

import java.io.*;

public class SpareArray {
    public static void main(String[] args) throws IOException {
//        创建原始的数组
        int chessArr1[][] = new int[11][11];
        chessArr1[1][2] = 1;
        chessArr1[2][4] = 2;
        chessArr1[4][5] = 2;
//        输出原始的数组
        System.out.println("原始的二维数组：");
        for(int [] row:chessArr1){
            for (int data : row){
//                格式化输出printf
                System.out.printf("%d\t",data);
            }
            System.out.println();
        }
//        将二维数组转化为稀疏数组
        int sum = 0;
        for (int i = 0; i < chessArr1.length; i++) {
            for (int j = 0; j < chessArr1[0].length; j++) {
                if(chessArr1[i][j] != 0)
                    sum++;
            }
        }
//        创建对应的稀疏数组
        int[][] sparseArr = new int[sum + 1][3];
        sparseArr[0][0] = chessArr1.length;
        sparseArr[0][1] = chessArr1[0].length;
        sparseArr[0][2] = sum;
//        遍历数组，将非0值存放到sparseArr中
        int count = 0;//记录第几个非0的数据
        for (int i = 0; i < chessArr1.length; i++) {
            for (int j = 0; j < chessArr1[0].length; j++) {
                if(chessArr1[i][j] != 0){
                    count++;
                    sparseArr[count][0] = i;
                    sparseArr[count][1] = j;
                    sparseArr[count][2] = chessArr1[i][j];
                }
            }
        }
//        将稀疏数组写入到文件
        File file = new File("E:\\map.txt");
        FileWriter out = new FileWriter(file);
        System.out.println("稀疏数组如下：");
        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]);
            out.write(sparseArr[i][0] + "\t" + sparseArr[i][1] + "\t" + sparseArr[i][2] + "\n");
        }
        out.close();
        FileReader fileReader = new FileReader("E:\\map.txt");
        BufferedReader bufferedReader = new BufferedReader(fileReader);
        String s = null;
        while ((s = bufferedReader.readLine()) != null){
            System.out.println(s);
        }
//        将spareArr 转化为原始的二维数组
        int[][]  chessArr2 = new int[sparseArr[0][0]][sparseArr[0][1]];
        for (int i = 1; i < sparseArr.length; i++) {
            chessArr2[sparseArr[i][0]][sparseArr[i][1]] = sparseArr[i][2];
        }
        System.out.println("恢复后的二维数组");
        for (int[] row : chessArr2){
            for (int data : row){
                System.out.printf("%d\t",data);
            }
            System.out.println();
        }
    }
}