Stuck on the validation!

Question about the task

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Don't really understand what is the request here, please help! What does it mean by set countFlags to countMinesOnField?

The rules of the game provide flags to help the player. They are needed to mark cells that might be mined. Accordingly, the number of flags (countFlags) must be equal to the number of mines (countMinesOnField).

You need to show flags somehow on the playing field. To do this, we'll create a constant to hold the symbol that represents them. Each cell in the model must have an isFlag field that will tell us whether a cell is flagged.

Requirements:

The MinesweeperGame class must have a private static final String FLAG field that is initialized when it is declared. For example, you can use the UTF-16 symbol for a flag: "\uD83D\uDEA9".
The MinesweeperGame class must have a private int countFlags field that stores the number of unused flags.
The createGame() method must set the countFlags field equal to countMinesOnField.
The GameObject class must have a public boolean isFlag field.

package com.codegym.games.minesweeper; public class GameObject { public int x; public int y; public boolean isMine; public int countMineNeighbors; public boolean isOpen; public boolean isFlag; public GameObject(int x, int y, boolean isMine) { this.x = x; this.y = y; this.isMine = isMine; this.countMineNeighbors = 0; this.isOpen = false; this.isFlag = false; } }