UVA Problem ID 784 (Maze Exploration)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class Main {
	static char grid[][]=new char[30][];
	static boolean wasVisited[][]=new boolean[30][];
	public static void main(String[] args) throws IOException {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String input;
		StringBuilder sb=new StringBuilder(1000);
		int testases=Integer.parseInt(br.readLine());
		for (int t1 = 0; t1 < testases; t1++) 
		{
			input=br.readLine();
			int t=0;
			do {
				grid[t]=new char[input.length()];
				wasVisited[t]=new boolean[input.length()];
				for (int j = 0; j rowlimit || column>columnlimit || row<0 || column<0 )
			return;
		if(grid[row][column]=='X' || wasVisited[row][column]==true)
			return;
			
		if(grid[row][column]==' ' || grid[row][column]=='*')
		{
			grid[row][column]='#';
			wasVisited[row][column]=true;
		}
		floodfill(row-1,column,rowlimit,grid[row-1].length-1);
		floodfill(row,column-1,rowlimit,grid[row].length-1);
		floodfill(row,column+1,rowlimit,grid[row].length-1);
		floodfill(row+1,column,rowlimit,grid[row+1].length-1);
	}
}