public static void Question2()
{
    double math;
    String s;
    Scanner sqrt = new Scanner(System.in);

    do
    {
        System.out.print("Enter a number: ");
        math = sqrt.nextDouble();
        System.out.println("The square root of "+math+ " is "+Math.sqrt(math));
        System.out.println("The cube root of "+math+" is "+Math.cbrt(math));
        System.out.println("The square of "+math+" is "+Math.pow(math,2));
        System.out.println("the cube of "+math+" is "+Math.pow(math, 3));

        System.out.println("Input another number? `y` / `n`");
        s = sqrt.next();
    }
    while (s == "y");
}