思路：可以用DFS求解。遍历这个二维数组，没发现一次未被发现的‘@’，便将其作为起点进行搜索。最后的答案，是这个遍历过程中发现了几次为被发现的‘@’

import java.util.*;public class Main{    public static void main(String[] args) {        Scanner in = new Scanner( System.in );        while( true ) {            int rows, cols;            rows = in.nextInt(); // read the rows            cols = in.nextInt(); // read the cols            if( rows == 0 && cols == 0 ) { // the input end                break;            }            OilDeposits od = new OilDeposits( rows, cols );            od.readGrids( in ); // read the strings            System.out.println( od.getPocketsAmount() );        }    }}class OilDeposits{    private int rows, cols;    private char grids[][];    private boolean vis[][];    private final int dir[][] = { // the eight directions            {-1,-1}, {-1,0}, {-1,1}, {0,-1}, {0,1}, {1,-1}, {1,0}, {1,1}        };    private final char EMPTY = '*';    private final char EXIST = '@';        public OilDeposits( int rows, int cols ) {        this.rows = rows;        this.cols = cols;        this.grids = new char[ rows + 5 ][ cols + 5 ];        this.vis = new boolean[ rows ][ cols ];        for( int i=0; i
     
      = this.rows || col < 0 || col >= this.cols || vis[row][col] || this.grids[row][col] == EMPTY ) {            return false;        }        return true;    }    public void readGrids( Scanner in ) {        String str;        for( int i=0; i
     

 其中之所以将Scanner的对象进行传递，是因为如果重新声明一个Scanner的对象，会使输入出错，错误的具体表现为一直等待输入，尽管已经在Console中输入了数据。猜测可能是未关闭上一个Scanner的对象导致的，所以这里将Scanner的对象进行传递。