Question

which one of below is better or to be prefered

new Object();  
Object.setValue1("1");  
Object.setValue2("2");  
Object.setValue3("3");  

or

new Object("1","2","3");

Answer 1

(I assume you’re talking about the design of your own classes, rather than how to use other already-designed classes.)

Neither is always “better,” it depends on the nature of the object and (to an extent) on your preferred style.

If an object cannot have a meaningful state without some external information, then requiring that information in the constructor makes sense, because then you can’t create instances with an invalid state.

However, having constructors that require as little information as possible is useful in terms of making the class easy to use in a variety of situations. If the class is such that a zero-arguments constructor is feasible and doesn’t complicate the class, it’s great in terms of supporting various use-cases, including cases where the instance is being built as part of parsing some other structure (JSON, XML, etc.).