Java - Calling Functions

This is the program that is executed:

public class callingClass
{
  public static void main(String[] args)
  {
     calledClass calledClassInstance = new calledClass();

     calledClassInstance.function1();      
     calledClassInstance.staticFunction2(); //call static function with
     calledClass.staticFunction2();         //instance name or class name
  }
}

---

This is called:

public class calledClass
{
  long n1 = 10, n2 = 20, total, product;

  public void function1()
  {
     total = n1+n2;
     System.out.printf("\nTOTAL = %d\n",total);
  }
  public static void staticFunction2()
  {
     product = n1*n2;
     System.out.printf("\nPRODUCT = %d\n",product);
  }
}