CAN interface have inner class with constructor?

Java compiler automatically creates a default constructor (Constructor with no arguments ) in case no constructor is present in the java class. Following are the motive behind a default constructor. Initialize all the instance variables of the class object.

Yes , you can define a class inside an interface.

A Java class constructor initializes instances (objects) of that class . Typically, the constructor initializes the fields of the object that need initialization. Java constructors can also take parameters, so fields can be initialized in the object at creation time.

Core Java Tutorial Java inner class can be declared private, public, protected, or with default access whereas an outer class can have only public or default access.

To instantiate an inner class, you must first instantiate the outer class. Then, create the inner object within the outer object with this syntax: OuterClass outerObject = new OuterClass(); OuterClass. InnerClass innerObject = outerObject .

You can observe the constructor chain for the inner class when you extend an inner class . so you can see that you are able to call the super constructor of your nested class passing to that constructor the MainClass , and calling . super on mainClass object instance.13 Nis 2012

Accessing the Private Members To instantiate the inner class, initially you have to instantiate the outer class. Thereafter, using the object of the outer class , following is the way in which you can instantiate the inner class.