Verification of the penultimate item fails

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Minesweeper (Part 5/16)

Games, Level 0, Lesson 0

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Be sure that a mine is created with a probability of 10%. Whats wrong in my code?

Minesweeper is aptly named. The player has to deal with mines, though maybe it would be best for the player to stay far away from them :)

Let's add these mines to the game. To do this, we'll adapt the GameObject class to account for the fact that a cell can be a mine (by adding the isMine flag).

Don't create a new constructor: editing the existing constructor will suffice.

Additionally, when creating the cells, add code that generates mines with a probability of 10%. The easiest way is to use the Game class's getRandomNumber(int n) method, which returns a random number from 0 to n-1 inclusive. Therefore, the probability of generating a certain number is 1/n.

And don't forget to count the number of generated mines in the MinesweeperGame class.

Once you've done all that, run the program and check that nothing is broken :)

Requirements:

The GameObject class must have a public boolean isMine field.
The GameObject class must have one constructor with (int, int, boolean) parameters that are used to initialize the x, y, and isMine fields, in that order.
There must be a private int countMinesOnField variable in the MinesweeperGame class.
When cells are created in the createGame() method, you should randomly determine whether each cell will have a mine. Use the Game class's getRandomNumber(int) method with the argument 10.
After the createGame() method is executed, the countMinesOnField variable should be assigned the value of the number of mines in the field.

package com.codegym.games.minesweeper; import com.codegym.engine.cell.*; public class MinesweeperGame extends Game{ private final static int SIDE = 9; private GameObject[][] gameField = new GameObject[SIDE][SIDE]; private int countMinesOnField; public void initialize (){ setScreenSize(SIDE, SIDE); createGame(); } private void createGame(){ int countMines = 0; for(int y = 0; y < SIDE; y++ ){ for(int x = 0; x < SIDE; x++){ int rand = getRandomNumber(10); setCellColor(x, y, Color.GREY); if(rand == 9){ gameField[y][x] = new GameObject(x, y, false); } else { gameField[y][x] = new GameObject(x, y, true); countMines += 1; } } } countMinesOnField = countMines; } }

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Olivier Boudigue

Level 41 , France, France

30 December 2022, 09:09

Hi llia Kalugin, what is your faut for that : After the createGame() method is executed, the countMinesOnField variable should be assigned the value of the number of mines in the field.

Guadalupe Gagnon

Level 37 , Tampa, United States

24 September 2020, 20:48

It looks like this code has a 90% chance of creating a mine and a 10% chance of not. Either: 1) Try changing the logic of line 20 from EQUALS 9 to DOES NOT EQUAL 9; or 2) swap lines 24 and 25 with line 21

Ilia Kalugin

Level 25 , Novara, Italy

24 September 2020, 21:08

Thanks! Help only 2) Anyway I do not understand why...

Ilia Kalugin

Level 25 , Novara, Italy

24 September 2020, 21:15

know understand! thank a lot!