How to make clear that a parameter of a method serves as a return value?

Is there a way to show that a parameter of a method serves as return value? If I want to return one value it is no problem: public Set addIntegerToSet(final int i) { Set<Integer&…

How to ensure thread safety of utility static method?

Is there any general way or rules exits by which we can ensure the thread safety of static methods specifically used in various Utility classes of any applications. Here I want to specifically point …

Why can attributes in Java be public?

As everybody knows, Java follows the paradigms of object orientation, where data encapsulation says, that fields (attributes) of an object should be hidden for the outer world and only accessed via …

Should Enterprise Java entities be dumb?

In our legacy Java EE application, there are loads of value object (VO) classes which typically contain only getters and setters, maybe equals() and hashCode(). These are (typically) the entities to …

Using Command Design pattern

Can anyone explain with a simple example the Command Pattern? I tried searching on the internet, but I got confused.