AP计算机教程10-4：简单多选题

Which line has the recursive call?

public static int factorial(int n)
{
   if (n == 0)
      return 1;
   else return n * factorial(n-1);
}

Which line has the recursive call?

public String starString(int n)
{
   if (n == 0) {
      return "*";
   } else {
      return starString(n - 1) + starString(n - 1);
   }
}

How many recursive calls does the following method contain?

public static int fibonacci(int n)
{
   if (n == 0)
      return 0;
   else if (n == 1)
      return 1;
   else return fibonacci(n-1) + fibonacci(n-2);
}

How many recursive calls does the following method contain?

public static int multiplyEvens(int n)
{
   if (n == 1) {
      return 2;
   } else {
      return 2 * n * multiplyEvens(n - 1);
   }
}