题解 | 扫雷

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        String a = in.nextLine();
        String[] aaa = a.split(" ");
        int n = Integer.valueOf(aaa[0]);
        int m = Integer.valueOf(aaa[1]);
        String[][] aa = new String[n+2][m+2];
        String[][] bb = new String[n+2][m+2];
        for(int i = 1; i< n+1 ;i++) {
            String b = in.nextLine();
           
            for(int j =1; j<m+1 ;j++) {
                aa[i][j] = String.valueOf(b.charAt(j-1));
            }
        }
        for(int i = 1; i< n+1;i++) {
            for(int j =1; j< m+1 ;j++) {
                if(aa[i][j].equals("*")){
                    bb[i][j] = "*";
                }else{
                    bb[i][j] = String.valueOf(getValue(aa[i-1][j-1]) + getValue(aa[i-1][j]) + getValue(aa[i-1][j+1])
                    + getValue(aa[i][j-1]) + getValue(aa[i][j+1])
                    + getValue(aa[i+1][j-1]) + getValue(aa[i+1][j]) + getValue(aa[i+1][j+1]));
                }
                System.out.print(bb[i][j]);
            }
             System.out.println();
        }
    }

    public static int getValue(String value){
        if(value!=null && value.equals("*")){
            return 1;
        }
        return 0;
    }
}