Should you call methods in a constructor?
You shouldn’t: calling instance method in constructor is dangerous because the object is not yet fully initialized (this applies mainly to methods than can be overridden). Also complex processing in constructor is known to have a negative impact on testability.
Can we call other methods from constructor?
Calling a method using this keyword from a constructor Yes, as mentioned we can call all the members of a class (methods, variables, and constructors) from instance methods or, constructors.
Can we use this in constructor?
Within an instance method or a constructor, this is a reference to the current object — the object whose method or constructor is being called. You can refer to any member of the current object from within an instance method or a constructor by using this .
Can we inherit constructor?
Constructors are not members of classes and only members are inherited. You cannot inherit a constructor. That is, you cannot create a instance of a subclass using a constructor of one of it’s superclasses.
What happens when Method chaining is not used?
When method chaining is not used, I can always know that a method call operates on something related to the result of the previous call – with chaining, this assumption breaks, and I have to semantically process the whole chain to understand what the actual object being called really is. For example:
What happens if I pass a parameter to a method?
If a method accepts a parameter of type Object, I should expect that any object I pass to the method will work. What it sounds like is that only certain subclasses of Object are allowed.
Why is method chaining a good practice in OOP?
Method Chaining is particularly effective with grammars like parent::= (this | that)*. The use of different methods provides readable way of seeing which argument is coming next. Similarly optional arguments can be easily skipped over with Method Chaining.
Why is it not good practice to chain objects?
Someone casually reading the code might not catch that it would be an implicitly returned object in the chain rather than the original reference. Chaining different objects can also lead to unexpected null errors. In my examples, assuming that foo is valid, all the method calls are “safe” (e.g., valid for foo). In the OP’s example: