No it is not possible, hence your runtime error. But you can assign an instance of a derived class to a variable of base class type.Correspondingly, can we create object of base class in Java?
When you inherit one class from another in Java, there is no such thing as a parent "subobject" for the object of the child class. The Derived object should not inherit from the Base object, but instead wrap it. class Derived { private Base base; public Derived(Base base) { this.
Similarly, can we assign parent object to child objects? Parent and Child classes having same data member in Java. The reference variable of the Parent class is capable to hold its object reference as well as its child object reference. In Java, methods are virtual by default (See this for details).
Similarly one may ask, can we create object of base class in C#?
In C#, both the base class and the derived class can have their own constructor. The constructor of a base class used to instantiate the objects of the base class and the constructor of the derived class used to instantiate the object of the derived class.
Can you cast a subclass to a superclass?
Casting from a subclass to a superclass is called upcasting. Typically, the upcasting is implicitly performed by the compiler. Upcasting is closely related to inheritance – another core concept in Java. It's common to use reference variables to refer to a more specific type.
What is the base class?
A base class is the parent class of a derived class. Classes may be used to create other classes. A class that is used to create (or derive) another class is called the base class. Also called a super class.What is the base class of all classes?
Object
Is the object class final?
The returned Class object is the object that is locked by static synchronized methods of the represented class. As it is final so we don't override it. It is called by the Garbage Collector on an object when garbage collector determines that there are no more references to the object.What is an interface?
In computing, an interface is a shared boundary across which two or more separate components of a computer system exchange information. The exchange can be between software, computer hardware, peripheral devices, humans, and combinations of these.Why object is the superclass of all classes?
All classes in Java by default "extend" the Object class, that's why Object is superclass of every class in Java. Class Object is the root of the class hierarchy. Every class has Object as a superclass. All objects, including arrays, implement the methods of this class.What is super keyword in Java?
super is a keyword. It is used inside a sub-class method definition to call a method defined in the super class. Private methods of the super-class cannot be called. Only public and protected methods can be called by the super keyword. It is also used by class constructors to invoke constructors of its parent class.What is Polymorphism in Java?
Polymorphism in Java is a concept by which we can perform a single action in different ways. We can perform polymorphism in java by method overloading and method overriding. If you overload a static method in Java, it is the example of compile time polymorphism. Here, we will focus on runtime polymorphism in java.Can we override static method?
Answer is, No, you can not override static method in Java, though you can declare method with same signature in sub class. It won't be overridden in exact sense, instead that is called method hiding. As per Java coding convention, static methods should be accessed by class name rather than object.Which constructor is called first in C#?
base constructor
What is the types of inheritance?
Types of Inheritance in C++ Multiple Inheritance. Hierarchical Inheritance. Multilevel Inheritance. Hybrid Inheritance (also known as Virtual Inheritance)Why do we use polymorphism in C#?
Polymorphism provides following features: It allows you to invoke methods of derived class through base class reference during runtime. It has the ability for classes to provide different implementations of methods that are called through the same name.What is base class in C# with example?
A base class, in the context of C#, is a class that is used to create, or derive, other classes. Classes derived from a base class are called child classes, subclasses or derived classes. A base class does not inherit from any other class and is considered parent of a derived class.What is polymorphism in C#?
Polymorphism in C# Polymorphism is a Greek word, meaning "one name many forms". Polymorphism provides the ability to a class to have multiple implementations with the same name. It is one of the core principles of Object Oriented Programming after encapsulation and inheritance.Can we inherit class with private constructor in C#?
If class with private constructor and sealed class cannot be inherited , then what is the use of class which cannot be inherited. That means the developer wants to create a strict singleton class which can not be inherited further. And as said previously private constructor can be excused as we have static classes now.Is a relationship C#?
Inheritance: Inheritance is “IS-A” type of relationship. “IS-A” relationship is a totally based on Inheritance, which can be of two types Class Inheritance or Interface Inheritance. Inheritance is a parent-child relationship where we create a new class by using existing class code.Can we inherit constructor in C++?
Historically constructors could not be inherited in the C++03 standard. You needed to inherit them manually one by one by calling base implementation on your own. Constructors are not inherited. They are called implicitly or explicitly by the child constructor.What does a derived class automatically inherit from the base class?
What does a derived class automatically inherit from the base class? All of these. When you define a derived class, you give only the added instance variables and the added methods as well as all the methods from the base class. You may substitute the keyword this for super() to call a constructor of the derived class. 
