Różnice między konstruktorem domyślnym a normalnym

In the English version the task specifically says that we should use the constructor:

public Cat () {}

To increase the count variable. If that is true for the polish version as well then using the:

public Kot( int licznikKotow ) {}

constructor would be incorrect and fail the task P.S. A default constructor is used when no other constructor is specified. It behave the same as a constructor with no arguments and no code, but if ANY constructor is there then it is not the default constructor: This code below uses the default constructor because no constructor is specified:

public class Kot {
   int licznikKotow;
}

While the code below, while being functionally the same, has a constructor so no default constructor will be used:

public class Kot {
   int licznikKotow;

   // this is exactly what a default constructor is, but it is not a default constructor
   public Kot () {
   }
}