![]() There are six usages of Java this keyword. It holds the reference to current class object or same class object. □ this keyword is a reference variable that refers to the current class object. To call immediate parent class constructor.Ĭ. To refer immediate parent class instance variable.ī. □ super keyword is a reference variable that refers to an immediate superclass object. What are the uses of super keyword in Java? A class cannot extend more than one class but a class can implement more than one interface.ġ6. □ Multiple inheritance can be implemented in Java by using the interface. How does multiple inheritance implement in Java? Therefore, to reduce ambiguity, complexity, and confusion, Java does not support multiple inheritance through class.įor more detail, go to this tutorial: Types of Inheritance in Javaġ5. At most, one class can extend only one class. □ Multiple inheritance means that one class extends two superclasses or base classes but in Java, one class cannot extend more than one class simultaneously. Why Java does not support multiple inheritance through class? Due to reducing the length of the code, redundancy of the application is also reduced.ġ4. ![]() One of the main advantages is that we can minimize the length of the duplicate code in an application by putting the common code in superclass and sharing amongst several subclasses.Ģ. □ The advantages of inheritance are as follows:ġ. It is used to achieve runtime polymorphism i.e method overriding.ġ3. Inheritance is used to use the existing features of the class.ĭ. Using inheritance, we can increase features of class or method by overriding.Ĭ. We can reuse the code from the base class.ī. □ We use inheritance in java for the following reasons:Ī. Implements: implements keyword is used for developing the inheritance between a class and interface. ![]() □ Inheritance can be implemented or achieved by using two keywords:Įxtends: extends is a keyword that is used for developing the inheritance between two classes and two interfaces. How is Inheritance implemented/achieved in Java? □ Object class is the superclass of every other class in Java.ġ1. Which class in Java is super class of every other class? This is a very good example of Is-A relationship.ġ0. It is implemented using “extends” keyword. □ Is-A relationship represents inheritance. The existing class is called parent class and the new class is called child class. In other words, inheritance is a process where a child class acquires all the properties and behaviors of parent class. □ The technique of creating a new class by using an existing class functionality is called inheritance. A method that is used for updating or setting the value of a variable is called setter method. ![]()
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