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Which of the following describes the creational pattern correctly?
Creational design patterns provide a way to create objects while hiding the creation logic, rather than instantiating objects directly using new opreator. Q 5 – Which of the following is correct about Structural design patterns. A – These design patterns are specifically concerned with communication between objects.
Which of the following describes the intercepting pattern correctly?
Q 16 – Which of the following describes the DAO pattern correctly? A – This pattern is used to separate low level data accessing API or operations from high level business services. B – This pattern is used to provide a centralized request handling mechanism so that all requests will be handled by a single handler.
Which of the following describes facade pattern correctly?
Q 3 – Which of the following describes the Facade pattern correctly? A – This pattern allows a user to add new functionality to an existing object without altering its structure. B – This pattern is used where we need to treat a group of objects in similar way as a single object.
When to use one object instead of all the parameters?
Idea is to use one object in place of all the parameters. Now even if you need to add parameters later, you just need to add it to the object. The method interface remains same. This is often a problem when constructing objects.
What’s the best way to pass the same parameter list?
If you find yourself passing same parameter list on several places, just create a class which holds them all. Even if you don’t find yourself passing same parameter list so often, that easy refactoring will still improve your code readability, which is always good.
When to pass many arguments to method in Java?
The method interface remains same. This is often a problem when constructing objects. In that case use builder object pattern, it works well if you have big list of parameters and not always need all of them. You can also adapt it to method invocation. It also increases readability a lot.
What’s the best way to pass an object around?
You can also pass that object around to other methods, put it in collections, etc. Of course if the set of parameters isn’t used elsewhere or passed around, a dedicated model may be overkill. There’s a balance to be struck, so use common sense.