Can somone explain ,what does the 7th requirement do..with setcellvalue?

Question about the task

Under discussion

The createGame() method must clear all items (flags, mines, numbers) from the playing field. Use the setCellValue(int, int, String) method. Pass an empty string as the last argument.

As you know, a real minesweeper is mistaken only once. But, fortunately, we can make lots of mistakes in our game.

Let's implement a way to restart the game. To do this, we'll create a restart() method, where we will start the game, and reset the number of hidden cells, mines, and points. Don't forget to update the score on the playing field and call the method responsible for creating a game.

In the restart method(), you also need to clear the flags, mines, numbers, etc. from the playing field. We'll restart the game by clicking the left mouse button.

Requirements:

The MinesweeperGame class must have a private void restart() method.
The restart() method must assign false to the isGameStopped field.
The isGameStopped field must not be assigned in the createGame() method.
The restart() method must restore the initial values of the countClosedTiles, score, and countMinesOnField fields.
The restart() method must call the setScore(int) method.
The restart() method must call the createGame() method after setting the initial values of the countClosedTiles, score and countMinesOnField fields.
The createGame() method must clear all items (flags, mines, numbers) from the playing field. Use the setCellValue(int, int, String) method. Pass an empty string as the last argument.
The onMouseLeftClick(int, int) method must call the restart() method and do nothing if the game is stopped.

package com.codegym.games.minesweeper; import com.codegym.engine.cell.Color; import com.codegym.engine.cell.Game; import java.util.ArrayList; import java.util.List; public class MinesweeperGame extends Game { private static final int SIDE = 9; private GameObject[][] gameField = new GameObject[SIDE][SIDE]; private int countMinesOnField; private static final String MINE="\uD83D\uDCA3"; private int countFlags; private static final String FLAG ="\uD83D\uDEA9"; private boolean isGameStopped ; private int countClosedTiles =SIDE*SIDE; private int score; @Override public void initialize() { setScreenSize(SIDE, SIDE); createGame(); } private void createGame() { // isGameStopped=false; for (int y = 0; y < SIDE; y++) { for (int x = 0; x < SIDE; x++) { boolean isMine = getRandomNumber(10) < 1; if (isMine) { countMinesOnField++; } gameField[y][x] = new GameObject(x, y, isMine); setCellColor(x, y, Color.ORANGE); } } countMineNeighbors(); countFlags=countMinesOnField; setCellValue(countFlags,countMinesOnField,""); } private List<GameObject> getNeighbors(GameObject gameObject) { List<GameObject> result = new ArrayList<>(); for (int y = gameObject.y - 1; y <= gameObject.y + 1; y++) { for (int x = gameObject.x - 1; x <= gameObject.x + 1; x++) { if (y < 0 || y >= SIDE) { continue; } if (x < 0 || x >= SIDE) { continue; } if (gameField[y][x] == gameObject) { continue; } result.add(gameField[y][x]); } } return result; } private void countMineNeighbors() { for (int i = 0; i < SIDE; i++) { for (int j = 0; j < SIDE; j++) { if(!gameField[i][j].isMine) { for(GameObject z:getNeighbors(gameField[i][j])) { if (z.isMine == true) gameField[i][j].countMineNeighbors++; } } } } } private void openTile(int x,int y) { if(gameField[y][x].isFlag ) { return; } if(gameField[y][x].isOpen ) { return; } if(isGameStopped==true ) { return; } gameField[y][x].isOpen = true; setCellColor(x,y,Color.GREEN); countClosedTiles--; if(gameField[y][x].isMine) { setCellValue(x,y,MINE); } else if(!gameField[y][x].isMine &&gameField[y][x].countMineNeighbors==0) { for(GameObject p:getNeighbors(gameField[y][x])) { if(!p.isOpen) openTile(p.x,p.y);//recursively on each neighbor that hasn't been revealed. } } else { setCellNumber(x,y,gameField[y][x].countMineNeighbors); // setCellValue(gameField[y][x].x, gameField[y][x].y, ""); } if(!gameField[y][x].isMine &&gameField[y][x].countMineNeighbors==0) { setCellValue(gameField[y][x].x, gameField[y][x].y, ""); } if(gameField[y][x].isMine) { setCellValueEx(x,y,Color.RED,MINE) ; gameOver(); } if(countClosedTiles==countMinesOnField&&!gameField[y][x].isMine) { win(); } if(gameField[y][x].isOpen&&!gameField[y][x].isMine) { score=score+5; } setScore(score); }//opentile closes private void markTile(int x,int y) { if(isGameStopped==true) return; if((gameField[y][x].isOpen==true)||(!gameField[y][x].isFlag&&countFlags==0)) return; if(!gameField[y][x].isFlag) { countFlags--; setCellValue(x,y,FLAG); gameField[y][x].isFlag=true; setCellColor(x,y,Color.YELLOW); }else if(gameField[y][x].isFlag) { countFlags++; setCellValue(x,y,""); gameField[y][x].isFlag=false; setCellColor(x,y,Color.ORANGE); } } @Override public void onMouseRightClick(int x, int y) { markTile(x,y); } private void gameOver() { isGameStopped=true; showMessageDialog(Color.GREEN, "GAME OVER", Color.RED, 40) ; } private void win() { isGameStopped=true; showMessageDialog(Color.GREEN, "Congrats you won", Color.GREEN, 40) ; } private void restart() { isGameStopped=false; countClosedTiles=SIDE*SIDE; score=0; countMinesOnField=0; createGame(); setScore(score); } @Override public void onMouseLeftClick(int x, int y) { // openTile(x,y); if(isGameStopped) { restart(); return; } this.openTile(x,y); } }

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Cittarasu Thirunavukkarasu

Level 22 , United States of America, United States

Expert

27 February 2022, 05:00

The solution expects to re-create the GameObject during restart and only clear the Game cell value to empty string. This is costly operation as you will have to re-create the object again during restart. Instead, it's better to clear the object variable if gameField[y][x] is not empty.

Cittarasu Thirunavukkarasu

Level 22 , United States of America, United States

Expert

27 February 2022, 05:00

private void createGame() {
     for (int y = 0; y < SIDE; y++) {
         for (int x = 0; x < SIDE; x++) {
             boolean isMine = getRandomNumber(10) < 1;
             if (isMine) {
                 countMinesOnField++;
             }
             if(gameField[y][x] == null) {
                 gameField[y][x] = new GameObject(x, y, isMine);
                 setCellColor(x, y, Color.GREY);
             } else {
                 setCellValue(x, y, "");
                 setCellColor(x, y, Color.GREY);
                 gameField[y][x].isFlag = false;
                 gameField[y][x].isOpen = false;
                 gameField[y][x].isMine = isMine;
                 gameField[y][x].countMineNeighbors = 0;
             }
         }
     }
     countFlags = countMinesOnField;
     countMineNeighbors();
 }

Cittarasu Thirunavukkarasu

Level 22 , United States of America, United States

Expert

27 February 2022, 05:02

The task will fail if you don't re-create object, so if you want the task to be completed. Please use the below code

private void createGame() {
    for (int y = 0; y < SIDE; y++) {
        for (int x = 0; x < SIDE; x++) {
            boolean isMine = getRandomNumber(10) < 1;
            if (isMine) {
                countMinesOnField++;
            }
            gameField[y][x] = new GameObject(x, y, isMine);
            setCellColor(x, y, Color.GREY);
            setCellValue(x, y, "");
        }
    }
    countFlags = countMinesOnField;
    countMineNeighbors();
}

silent_sunshine

Level 23 , Orlando, United States

18 February 2021, 03:47

I forget something , add the code in createGame() method.

silent_sunshine

Level 23 , Orlando, United States

18 February 2021, 03:46

you just need add "setCellValue(x, y, "")" after setCellColor(x, y, Color.ORANGE), then it is ok. because the game is over, and the MINE, the FLAG have been drawed in the gameField, now you create a new game, you need to clear these MINE and FLAG to empty string ("")