Why it has to be static class Hobby?

Up to now you have always used sout with objects that you created in the class or transferred to it (or its method (main e.g.). So you have created it by yourself: (ExampleClass variablename= new ExampleClass(); )and this object was availible after that. Now you don't have to make it . It's STATIC - always availible - you can use it everytime and everywhere. I interface Dream { private static Hobby HOBBY = new Hobby(); //this is the moment of creation... a long time ago....and now you can use , use, and use it. no matter where you want to do it. }