Java while循环直到满足条件

Question

试图让用户在两组值之间输入正确的整数，但例如，如果用户输入错误的 integer，则 while 循环会跳过并运行到我程序中的下一个代码。 如果有人能指出我如何让用户在每一步都弄错时重复这个问题，我将不胜感激。

System.out.print("How many asteroids: ");
    int asteroid = input.nextInt();
    while (asteroid > 0) {
        System.out.print("x location of the asteroid (between 1-950 pixels): ");
        double asteroidLocationX = input.nextDouble();
        if (asteroidLocationX >= 1 && asteroidLocationX <= 950) {
            System.out.print("y location of the asteroid (between 150-550 pixels): ");
            double asteroidLocationY = input.nextDouble();
            if (asteroidLocationY >= 150 && asteroidLocationY <= 550) {
                System.out.print("Width of the asteroid (min: 30 pixels, max: 50 pixels): ");
                double asteroidSizeWidth = input.nextDouble();
                if (asteroidSizeWidth >= 30 && asteroidSizeWidth <= 50) {
                    System.out.print("Height of the asteroid (min: 30 pixels, max: 50 pixels): ");
                    double asteroidSizeHeight = input.nextDouble();
                    if (asteroidSizeHeight >= 30 && asteroidSizeHeight <= 50) {
                        gc.setFill(Color.ALICEBLUE);
                        gc.fillOval(asteroidLocationX, asteroidLocationY, asteroidSizeWidth, asteroidSizeHeight);
                    } else
                        System.out.println("Wrong input, try again");
                } else
                    System.out.println("Wrong input, try again");
            }else
                System.out.println("Wrong input, try again");
        } else
            System.out.println("Wrong input, try again");
        asteroid--;
    }

Answer 1

如果答案有问题，你需要重新提问

double val = -1;
do {
  System.out.println("Enter a number between 1 and 10");
  val = input.nextDouble();
while (input >= 1 && input <= 10);