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public class RecursionTesting
{
  static int num=4;
  public static void main(String[] args)
  {
    new RecursionTesting().recursiveMethod();
  }

  void recursiveMethod()
  {
    num--;
    if(num == 0)
      return;
    System.out.print(num + " ");
    recursiveMethod();
  }
}

public class RecursionTest2
{
  public static void main(String[] args)
  {
    RecursionTest2 rt2 = new RecursionTest2();
    int sum = rt2.summer(4);
    System.out.println(sum);
  }

  int summer(int in)
  {
    int sum = 0;

    if(in ==0)
   return 0;

    sum = in + summer(--in); 
    return sum;
  }
}

public class RecursionTest3
{
  public static void main(String[] args)
  {
    RecursionTest3 rt3 = new RecursionTest3();
    int multiplication = rt3.multiplier(4);
    System.out.println(multiplication);
  }
 
  int multiplier(int in)
  {
    System.out.println("IN " + in);

    int mul = 0;

    if(in ==0)
    return 1;

    mul= in * multiplier(--in); 
    return mul;
  }
}