00000
00000
00000

X0000
00000
00000

import java.util.*;
import java.lang.*;

class Main
{
        public static void main (String[] args) throws java.lang.Exception
        {
                String[][] array = {{"0","0","0"},{"0","0","0"},{"0","0","0"}};

                System.out.println("Before: ");
                printArray(array);


                array[0][0] = "x";
                System.out.println("After: ");
                printArray(array);

        }

        private static void printArray(String[][] array){
                for(int i=0; i<array.length; i++){
                        for(int j=0; j<array[0].length; j++){
                                System.out.print(array[i][j]);
                        }
                        System.out.println("");
                }
        }
}