Something

import java.util.*;

public class Pozzle { 
  char[][] grids; 
  
  public Pozzle() {
    Random r = new Random();
    char[][] grids = new char[10][10];
    
    for (int i=0;i<grids.length;i++)
      for (int j=0;j<grids[i].length;j++)
        grids[i][j]= (char)(65 + r.nextInt(26));
    
    for (int i=0;i<grids.length;i++) {
      for (int j=0;j<grids[i].length;j++)
        System.out.print(grids[i][j]+" ");
      System.out.println();
    }
  }
  
  public Pozzle(int row, int col){ 
    char[][] grids = new char[row][col];
     for (int i=0;i<grids.length;i++)
      for (int j=0;j<grids[i].length;j++)
        grids[i][j]= (char)(65 + r.nextInt(26));
    
    for (int i=0;i<grids.length;i++) {
      for (int j=0;j<grids[i].length;j++)
        System.out.print(grids[i][j]+" ");
      System.out.println();
  }
  
  public static void main ( String[] args ) {
    Pozzle pozz = new Pozzle();
  }
} 
//Left click to shoot, arrow keys to move. Enjoy!