Why might one also use a blank constructor?

Question

I was reading some Java recently and came across something (an idiom?) new to me: in the program, classes with multiple constructors would also always include a blank constr

Answer 1

The default constructor is'nt a good pratice for the functional view. The default constructor is used if the object have a global visibility into a method: for example, you want log the actual state of a object in a try/catch you can code

MyObejct myObject=null
try{...
}catch(Exception e){
    log.error(myObject);//maybe print null. information?
}

or do you prefer

MyObejct myObject=new Object();
try{...
}catch(Exception e){
log.error(myObject);//sure print  myobject.toString, never null. More information
}

?

Anotherway the create a EMPTY object have'nt a lot of logic, but instatiate a NULL object is harmuful in my opinion. You can read this post