- 1 What is super class in Java with example?
- 2 What is subclass and super class in Java?
- 3 What is overriding in Java?
- 4 What is this () in Java?
- 5 Can you make a constructor final?
- 6 What is difference between superclass and subclass?
- 7 What does Super do in Java?
- 8 Why method overriding is used?
- 9 What is overriding in OOP?
- 10 Why we Cannot override static method?
- 11 Why do you use Java?
- 12 What is this () in constructor?
- 13 What is difference between i ++ and ++ i in Java?
What is super class in Java with example?
We can use super keyword to access the data member or field of parent class. It is used if parent class and child class have same fields. In the above example, Animal and Dog both classes have a common property color. If we print color property, it will print the color of current class by default.
What is subclass and super class in Java?
In Java, it is possible to inherit attributes and methods from one class to another. subclass (child) – the class that inherits from another class. superclass (parent) – the class being inherited from.
What is overriding in Java?
In any object-oriented programming language, Overriding is a feature that allows a subclass or child class to provide a specific implementation of a method that is already provided by one of its super-classes or parent classes.
What is this () in Java?
In Java, both this and this() are completely different from each other. this keyword is used to refer to the current object, i.e. through which the method is called. this() is used to call one constructor from the other of the same class.
Can you make a constructor final?
No, a constructor can’t be made final. A final method cannot be overridden by any subclasses. In other words, constructors cannot be inherited in Java therefore, there is no need to write final before constructors.
What is difference between superclass and subclass?
Superclass and Subclass are two terms that are related to inheritance. The key difference between the Superclass and Subclass is that Superclass is the existing class from which the new classes are derived while Subclass is the new class that inherits the properties and methods of the Superclass.
What does Super do in Java?
The super keyword in Java is a reference variable that is used to refer parent class objects. The super() in Java is a reference variable that is used to refer parent class constructors. super can be used to call parent class’ variables and methods. super() can be used to call parent class’ constructors only.
Why method overriding is used?
Method Overriding is a feature that allows us to redefine the method in the subclass or derived class which is already defined in its parent class or superclass. In any object-oriented programming language, we can implement Method Overriding only when two classes have ‘Is-a’ relationship of inheritance between them.
What is overriding in OOP?
Overriding is an object-oriented programming feature that enables a child class to provide different implementation for a method that is already defined and/or implemented in its parent class or one of its parent classes. Overriding enables handling different data types through a uniform interface.
Why we Cannot override static method?
Static methods cannot be overridden because they are not dispatched on the object instance at runtime. The compiler decides which method gets called. Static methods can be overloaded (meaning that you can have the same method name for several methods as long as they have different parameter types).
Why do you use Java?
Java was designed to be easy to use and is therefore easy to write, compile, debug, and learn than other programming languages. Java is object-oriented. This allows you to create modular programs and reusable code.
What is 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.
What is difference between i ++ and ++ i in Java?
++i and i++ both increment the value of i by 1 but in a different way. Increment in java is performed in two ways, 1) Post-Increment (i++): we use i++ in our statement if we want to use the current value, and then we want to increment the value of i by 1.