java - 为什么我的对象引用在 do/while 循环中出现错误？

Question

public boolean ChecktheNum()
{
    if (number == (int)number && number <= max && number >= 1)
    {
       return true;
    }

    return false;
}

do
{
    String num2=JOptionPane.showInputDialog(" Guess a integer between 1 and "+max);
    int max2 = Integer.parseInt(num2);
    GuesstheNum game= new GuesstheNum(max2);
    game.ChecktheNum();
} while (game.ChecktheNum == false)

我的测试程序文件和 do while 循环遇到问题。出现错误，.game 是找不到符号为什么是这样？即使我尝试中断方法，错误仍然会出现另外我需要测试输入的数字是否是整数，这个函数也不起作用，因为它不要求另一个输入

Answer 1

do{ 
    ...
    GuesstheNum game= new GuesstheNum(max2);
    game.ChecktheNum();
}while(game.ChecktheNum == false)

game 不在 while 的范围内。你可以这样做

GuesstheNum game;

do{ 
    ...
    game= new GuesstheNum(max2);
    game.ChecktheNum();
}while(game.ChecktheNum == false)

编辑:尝试这样的事情

    GuesstheNum game;
    boolean guess;
    do {
        String num2 = JOptionPane.showInputDialog(" Guess a integer between 1 and " + max);
        int max2 = Integer.parseInt(num2);
        game = new GuesstheNum(max2);
        guess = game.ChecktheNum();
    } while (guess);

更简单地说

GuesstheNum game;

    do {
        String num2 = JOptionPane.showInputDialog(" Guess a integer between 1 and " + max);
        int max2 = Integer.parseInt(num2);
        game = new GuesstheNum(max2);
    } while (game.ChecktheNum());

编辑:使用整数检查

GuesstheNum game;
do {
    String num2 = JOptionPane.showInputDialog(" Guess a integer between 1 and " + max);
    int max2;
    try{
        int max2 = Integer.parseInt(num2);
    } catch (NumberFormatException ex){
        continue;
    }
    game = new GuesstheNum(max2);
} while (!game.ChecktheNum());