20x20?

import java.util.*;
import java.io.*;

public class EraseProjectPKagranaPeriod3 {

	Scanner in = null;
	private String[][] grid = new String[20][20];
	private int xPos, yPos;

	public static void main(String[] args) {
		EraseProjectPKagranaPeriod3 e = new EraseProjectPKagranaPeriod3();
		System.out.println("     1  2  3  4  5  6  7  8  9  10 11 12 13 14 15 16 17 18 19" + "\n");
		e.loadFile();
		e.erase();
	}

	public void loadFile() {
		File inFile = new File("digital.txt");

		try{
			in = new Scanner(inFile);
		}catch(FileNotFoundException e){
			System.out.println(e.getMessage());
		}

		int firstNum = in.nextInt();

		while(in.hasNext()) {
			int row = in.nextInt();
			int col = in.nextInt();
			grid[row-1][col-1] = "@";

		} // end of while-loop

		for (int i = 0; i < grid.length; i++) {
			for (int j = 0; j < grid.length; j++) {
				if(grid[i][j] != "@") {
					grid[i][j] = "-";
				}
			}
		} // end of outer for-loop

		// for printing
		for (int i = 0; i < grid.length; i++) {
	  		 System.out.print( (i+1) + "  ");
	  	     for (int j = 0; j < grid[i].length; j++) {

	  	        System.out.printf("%3s", grid[i][j]);
	  	     }
	  	     System.out.println();
		} // end of outer for-loop
	} // end of method

	public void erase() {
		Scanner input = new Scanner(System.in);

		System.out.print("\nEnter y coordinate of point to erase: ");
		yPos = input.nextInt();
		System.out.print("Enter x coordinate of point to erase: ");
		xPos = input.nextInt();
	}

	public void move() {
		/*
		If the element at (xPos, yPos) is part of an object
		then you will want to erase that entire object

		 */
	}

}// end of class