8A. Java Basics for Selenium - Constructors - Interview Questions

Define a constructor?
A constructor is a method used to initialize the state of an object, and it gets invoked at the time of object creation. Rules for constructor are:
Constructor Name should be same as class name.
A constructor must have no return type.
When does the compiler supply a default constructor for a class?
The compiler supplies a default constructor for a class if no other constructors are provided.
Will the compiler create a default constructor if I have a parameterized constructor in the class?
No, compiler won’t create default constructor if there is parameterized constructor in the class. For example, if I have a class with no constructors, then compiler will create default constructor.
Can we have a method name same as class name in java?
Yes. we can have method name same as class name it won’t throw any compilation error but it shows a warning message that method name is same as class name.
Can we override constructors in java?
Only methods can be overridden in java. Constructors can’t be inherited in java. So, there is no point of overriding constructors in java.
How to call one constructor from the other constructor?
• Within same class: It can be done using this() keyword for constructors in same class
• From base class: by using super() keyword to call constructor from the base class.
This is also called constructor chaining.