3 и 4 пункт. Хочу стукнуть моник
package com.javarush.games.minesweeper;
public class GameObject {
public int x;
public int y;
public boolean isMine;
public int countMineNeighbors;
GameObject(int x, int y, boolean z) {
this.x = x;
this.y = y;
this.isMine = z;
}
}