There are four types of inner classes: member, static member, local, and anonymous.
Read moreWhat means nested class?
In object-oriented programming (OOP), an inner class or nested class is a class declared entirely within the body of another class or interface . It is distinguished from a subclass.
Read moreWhat is the difference between nested and inner classes?
A class that is defined within another class is called a nested class. An inner class, on the other hand, is a non-static type, a particular specimen of a nested class.6 Mar 2017
Read moreWhy is it important to provide a default constructor in Java What happens if your class doesn’t have a no argument constructor?
The arguments of a constructor can only be found by type, not by name, so there is no way for the framework to reliably match properties to constructor args. Therefore, they require a no-arg constructor to create the object, then can use the setter methods to initialise the data .
Read moreIs it mandatory to have default constructor?
The compiler doesn’t ever enforce the existence of a default constructor. You can have any kind of constructor as you wish. For some libraries or frameworks it might be necessary for a class to have a default constructor, but that is not enforced by the compiler .
Read moreWhat is the purpose of a default constructor when must the developer provide the constructor explicitly?
In both Java and C#, a “default constructor” refers to a nullary constructor that is automatically generated by the compiler if no constructors have been defined for the class . The default constructor implicitly calls the superclass’s nullary constructor, then executes an empty body.
Read moreIs it always necessary to provide a default constructor for a class Why or why not?
If a class is not required to initialize its data member or does not contain data member, there is no need to write empty constructor explicitly . On class object creation, default constructor implicitly called will be enough. In below class, default constructor will be called on object creation of the class.
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