Different kinds of objects often have a certain amount in common with each other. Mountain bikes, road bikes, and tandem bikes, for example, all share the characteristics of bicycles (current speed, current pedal cadence, current gear).
Yet each also defines additional features that make them different: tandem bicycles have two seats and two sets of handlebars; road bikes have drop handlebars; some mountain bikes have an additional chain ring, giving them a lower gear ratio.Object-oriented programming allows classes to inherit commonly used state and behavior from other classes. In this example, Bicycle now becomes the superclass of MountainBike, RoadBike, and TandemBike. In the Java programming language, each class is allowed to have one direct superclass, and each superclass has the potential for an unlimited number of subclasses:A hierarchy of bicycle classes.The syntax for creating a subclass is simple. At the beginning of your class declaration, use the extends keyword, followed by the name of the class to inherit from.
Hierarchical Inheritance In Java
Inheritance in JavaThe process of obtaining the data members and methods from one class to another class is known as inheritance. It is one of the fundamental features of object-oriented programming. Note: In Inheritance the scope of access modifier increasing is allow but decreasing is not allow. Suppose in parent class method access modifier is default then it's present in child class with default or public or protected access modifier but not private(it decreased scope). Tpyes of InheritanceBased on number of ways inheriting the feature of base class into derived class we have five types of inheritance; they are:. Single inheritance. Multiple inheritance.
Hierarchical inheritance. Multilevel inheritance. Hybrid inheritanceSingle inheritanceIn single inheritance there exists single base class and single derived class.
Inheritance Code In Java
Output Salary is: 30000.0Bonous is: 2000.0Multilevel inheritances in JavaIn Multilevel inheritances there exists single base class, single derived class and multiple intermediate base classes.Single base class + single derived class + multiple intermediate base classes. Intermediate base classesAn intermediate base class is one in one context with access derived class and in another context same class access base class.Hence all the above three inheritance types are supported by both classes and interfaces. Output Total Salary is: 37000.0Multiple inheritanceIn multiple inheritance there exist multiple classes and singel derived class.The concept of multiple inheritance is not supported in java through concept of classes but it can be supported through the concept of interface. Hybrid inheritanceCombination of any inheritance typeIn the combination if one of the combination is multiple inheritance then the inherited combination is not supported by java through the classes concept but it can be supported through the concept of interface. Inheriting the feature from base class to derived classIn order to inherit the feature of base class into derived class we use the following syntax.