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我在我创建的一个游戏中遇到了一个循环问题。我有一个10×10网格的游戏板。这是一个三部分的挑战。第一部分要求20个随机宝藏，我做得很好。第二部分是随机添加20个巨魔。我使用的循环给了我20个宝藏和30个巨魔。我不擅长打圈。我必须遵循这些代码行，不能使用break（我是java新手，但这是我的profs规则）。

private int width = 10;
private int height = 10;
//Create an array to hold buttons in a 10 by 10 grid
private EmptyButton [] buttons = new EmptyButton [width*height];

        Random random = new Random();
        int counter = 0;
        //Using a while loop when counter is less than number of treasures still hidden
        while(counter < game.getNumberStillHidden())
        {
            //Declare insertion variable and set to random to place buttons randomly
            int insertionIndex = random.nextInt(buttons.length);
            //Using conditional if button at index is null
            if(buttons[insertionIndex] == null)
            {
                //insert a treasure button
                buttons[insertionIndex] = new TreasureButton(game, this);
                //Use an acumulator for the counter to move on
                counter ++;
            }
        }
        while(counter < game.getNumberOfTriesLeft())
        {
            Random randomOne = new Random();
            //Declare insertion variable and set to random to place buttons randomly
            int insertionIndex = randomOne.nextInt(buttons.length);
            if(buttons[insertionIndex] == null)
            {
                //insert a treasure button
                buttons[insertionIndex] = new TrollButton(game, this);
                //Use an acumulator for the counter to move on
                counter ++;
            }
        }

        // Loop to add EmptyButton()'s into remaining null indexes within the button array
        for (int index = 0; index < buttons.length; index++)
        {
            // if the current index is null
            if (buttons[index] == null)
            {
                //add an EmptyButton() 
                buttons[index] = new EmptyButton(newGame, this);
            }
        }
        // Loop to add all of the contents of the buttonGrid into the gamePanel
        for (int index = 0; index < buttons.length; index++)
        {
            //add buttons to panel
            gridPanel.add(buttons[index]);
        }